Items where Author is "Ahmed, Osumanu Haruna"

Ibrahim, Mohamad Hilmi and Kasim, Susilawati and Ahmed, Osumanu Haruna and Mohd. Rakib, Mohd. Rashid and Hasbullah, Nur Aainaa and Islam Shajib, Md. Tariqul (2024) Impact of simulated acid rain on chemical properties of Nyalau series soil and its leachate. Scientific Reports, 14 (1). art. no. 3534. pp. 1-11. ISSN 2045-2322

Paramisparam, Puvan and Ahmed, Osumanu Haruna and Ch’ng, Huck Ywih and Omar, Latifah and Johan, Prisca Divra and Hamidi, Nur Hidayah and Musah, Adiza Alhassan (2023) Changes in potassium sorption and pH buffering capacity of tropical acid soils following application of charcoal and sago bark ash. Malaysian Journal of Soil Science, 27. 56 - 69. ISSN 1394-7990

Hassan, Mohd Hasyrin and Latifah, Omar and Ahmed, Osumanu Haruna and Ng, Ji Feng and Perumal, Mugunthan and Mohd Roslim, Muhammad Huzaifah (2023) Black soldier fly larvae frass production for managing water hyacinth encroachment. International Journal of Agriculture, Forestry and Plantation, 2023 (13). 75 - 79. ISSN 2462-1757

Rajan, Kavitha and Omar, Latifah and Ahmed, Osumanu Haruna and Charles, Primus Walter and Kasim, Susilawati (2023) Potential of rejected sago starch as a coating material for urea encapsulation. Polymers, 15 (8). art. no. 1863. pp. 1-17. ISSN 2073-4360

Krishnan, Kavinraj and Ahmed, Osumanu Haruna and Omar, Latifah and Ali, Maru and Chowdhury, Ahmed Jalal Khan and Musah, Adiza Alhassan (2023) Fate of nitrogen in a tropical peat soil treated with clinoptilolite zeolite. Desalination and Water Treatment, 281. pp. 217-224. ISSN 1944-3994; ESSN: 1944-3986

Ali, Maru and Ahmed, Osumanu Haruna and Jalloh, Mohamadu Boyie and Primus, Walter Charles and Musah, Adiza Alhassan and Ng, Ji Feng (2022) Co-composted chicken litter biochar increases soil nutrient availability and yield of Oryza sativa L. Land, 12 (1). art. no. 233. pp. 1-20. ISSN 2073-445X

Visvini, Lohanathan and Latifah, Omar and Ahmed, Osumanu Haruna and Wei, Jie Kurk and Cassandra, David Sarah (2022) Production and incorporation of black soldier fly larvae frass in retaining nitrogen from urea. Advances in Image and Video Processing, 10 (4). pp. 395-412. ISSN 2054-7412

Kavitha, Rajan and Latifah, Omar and Ahmed, Osumanu Haruna and Primus, Walter Charles and Susilawati, Kasim (2022) Rejected sago starch as a coating material to mitigate urea-nitrogen emission. Agronomy, 12 (4). art. no. 941. pp. 1-17. ISSN 2073-4395

Ng, Ji Feng and Ahmed, Osumanu Haruna and Jalloh, Mohamadu Boyie and Omar, Latifah and Yee, Min Kwan and Musah, Adiza Alhassan and Poong, Ken Heong (2022) Soil nutrient retention and pH buffering capacity are enhanced by Calciprill and Sodium Silicate. Agronomy, 12 (1). art. no. 219. pp. 1-24. ISSN 2073-4395

Lee, Yit Leng and Ahmed, Osumanu Haruna and Abdul Wahid, Samsuri and Jalloh, Mohamadu Boyie and Musah, Adiza Alhassan (2021) Nutrient release and ammonia volatilization from biochar-blended fertilizer with and without densification. Agronomy, 11 (10). art. no. 2082. pp. 1-16. ISSN 2073-4395

Johan, Prisca Divra and Ahmed, Osumanu Haruna and Omar, Latifah and Hasbullah, Nur Aainaa (2021) Transformation in soils following co-application of charcoal and wood ash. Agronomy-Basel, 11 (10). art. no. 2010. pp. 1-25. ISSN 2073-4395

Krishnan, Kavinraj and Ngerong, Audrey Awing and Ahim, Karen and Ahmed, Osumanu Haruna and Ali, Maru and Omar, Latifah and Musah, Adiza Alhassan (2021) Mitigating potassium leaching from muriate of potash in a tropical peat soil using clinoptilolite zeolite, forest litter compost, and chicken litter biochar. Agronomy, 11 (10). art. no. 1900. pp. 1-16. ISSN 2073-4395

Hamidi, Nur Hidayah and Ahmed, Osumanu Haruna and Omar, Latifah and Huck, Ywih Ch’ng (2021) Soil nitrogen sorption using charcoal and wood ash. Agronomy-Basel, 11 (9). art. no. 1801. pp. 2-34. ISSN 2073-4395

Johan, Prisca Divra and Ahmed, Osumanu Haruna and Maru, Ali and Omar, Latifah and Hasbullah, Nur Aainaa (2021) Optimisation of Charcoal and Sago (Metroxylon sagu) Bark Ash to Improve Phosphorus Availability in Acidic Soils. Agronomy, 11 (9). art. no. 1803. pp. 1-28. ISSN 2073-4395

Hossain, Md Imam and Ahmad, Khairulmazmi and Vadamalai, Ganesan and Siddiqui, Yasmeen and Saad, Norsazilawati and Ahmed, Osumanu Haruna and Mohd Hata, Erneeza and Adzmi, Fariz and Rashed, Osamah and Rahman, Muhammad Ziaur and Kutawa, Abdulaziz Bashir (2021) Phylogenetic analysis and genetic diversity of Colletotrichum falcatum isolates causing sugarcane red rot disease in Bangladesh. Biology, 10 (9). art. no. 862. pp. 1-25. ISSN 2079-7737

Che Sulaiman, Intan Soraya and Mohamad, Azham and Ahmed, Osumanu Haruna (2021) Murdannia loriformis: a review of ethnomedicinal uses, phytochemistry, pharmacology, contemporary application, and toxicology. Evidence-based Complementary and Alternative Medicine, 2021. art. no. 9976202. pp. 1-15. ISSN 1741-427X; ESSN: 1741-4288

Jeffary, Alicia Vanessa and Ahmed, Osumanu Haruna and Kueh, Roland Jui Heng and Lim, Liza Nuriati Kim Choo and Omar, Latifah and Alhassan Musah, Adiza and Abdu, Arifin (2021) Nitrous oxide emissions in pineapple cultivation on a tropical peat soil. Sustainability, 13 (9). art. no. 4928. pp. 1-14. ISSN 2071-1050

Yit, Leng Lee and Ahmed, Osumanu Haruna and Abdul Wahid, Samsuri and Ab Aziz, Zakry Fitri (2021) Biochar tablets with and without embedded fertilizer on the soil chemical characteristics and nutrient use efficiency of zea mays. Sustainability, 13 (9). p. 4878.

Palanivell, Perumal and Ahmed, Osumanu Haruna and Omar, Latifah and Abdul Majid, Nik Muhamad (2021) Nitrogen, phosphorus, and potassium adsorption and desorption improvement and soil buffering capacity using clinoptilolite zeolite. Agronomy, 11 (2). art. no. 379. pp. 1-20. ISSN 2073-4395

Lim Kim Choo, Liza Nuriati and Ahmed, Osumanu Haruna and Nik Majid, Nik Muhamad and Abdul Aziz, Zakry Fitri (2021) Pineapple residue ash reduces carbon dioxide and nitrous oxide emissions in pineapple cultivation on tropical peat soils at Saratok, Malaysia. Sustainability (Switzerland), 13 (3). pp. 1-23. ISSN 20711050

Johan, Prisca Divra and Ahmed, Osumanu Haruna and Omar, Latifah and Hasbullah, Nur Aainaa (2021) Charcoal and sago bark ash on pH buffering capacity and phosphorus leaching. Agronomy-Basel, 11 (11). art. no. 2223. pp. 1-10. ISSN 2073-4395

Sulok, Kevin Muyang Tawie and Ahmed, Osumanu Haruna and Choy, Yuen Khew and Zehnder, Jarroop Augustine Mercer and Jalloh, Mohamadu Boyie and Musah, Adiza Alhassan and Abdu, Arifin (2021) Chemical and biological characteristics of organic amendments produced from selected agro-wastes with potential for sustaining soil health: a laboratory assessment. Sustainability, 13 (9). art. no. 4919. pp. 1-15. ISSN 2071-1050

Ng, Ji Feng and Ahmed, Osumanu Haruna and Omar, Latifah and Jalloh, Mohamadu Boyie and Kwan, Yee Min and Poong, Ken Heong and Musah, Adiza Alhassan (2021) Combined use of Calciprill and sodium silicate improves low pH soil chemical properties. Agronomy-Basel, 11 (10). art. no. 2070. pp. 1-19. ISSN 2073-4395

Hamidi, Nur Hidayah and Ahmed, Osumanu Haruna and Omar, Latifah and Huck, Ywih Ch'ng (2021) Combined use of charcoal, sago bark ash, and urea mitigate soil acidity and aluminium toxicity. Agronomy-Basel, 11 (9). art. no. 1799. pp. 1-15. ISSN 2073-4395

Abdul Reeza, Ameera and Hussin, Aminuddin and Ahmed, Osumanu Haruna (2021) Comparison of the effectiveness of three extractants in extracting potassium, calcium and magnesium from tropical peat soils. Mires and Peat, 27. art. no. 6. pp. 1-10. ISSN 0039-5471; ESSN: 2489-8740

Omar, Latifah and Ahmed, Osumanu Haruna and Jalloh, Mohamadu Boyie and Abdul Majid, Nik Muhamad (2021) Rice husk compost production and use in mitigating ammonia volatilization from urea. Sustainability, 13 (4). art. no. 1832. pp. 1-23. ISSN 2071-1050

Abdullahi, Adamu and Ahmad, Khairulmazmi and Ismail, Intan Safinar and Asib, Norhayu and Ahmed, Osumanu Haruna and Abubakar, Abubakar Ismaila and Siddiqui, Yasmeen and Ismail, Mohd Razi (2020) Potential of using ginger essential oils-based nanotechnology to control tropical plant diseases. Plant Pathology Journal, 36 (6). 515 - 535. ISSN 1598-2254; ESSN: 2093-9280

Ariffin, Mohd Rizal and Ahmed, Osumanu Haruna and Mohd Saud, Halimi and Md Isa, Isharudin and Khairuddin, Mohd Nizar (2020) Nitrification potential of a tropical peat soil under oil palm (Elaeis guineensis jacq.) cultivation at different operational zones and soil depths. Plant Archives, 20 (1). 3117 - 3122. ISSN 0972-5210; ESSN: 2581-6063

Perumal, Palanivell and Ahmed, Osumanu Haruna and Omar, Latifah and Nik Ab. Majid, Nik Muhamad (2020) Adsorption and desorption of nitrogen, phosphorus, potassium, and soil buffering capacity following application of chicken litter biochar to an acid soil. Applied Sciences, 10 (1). art. no. 295. pp. 1-18. ISSN 2076-3417

Lim, Liza Nuriati Kim Choo and Ahmed, Osumanu Haruna and Abdul Talib, Shaidatul Azdawiyah and Abdul Ghani, Mohamad Zabawi and Sekot, Shamsiah (2020) Clinoptilolite zeolite on tropical peat soils nutrient, growth, fruit quality, and yield of Carica papaya L. cv. Sekaki. Agronomy-Basel, 10 (9). pp. 1-18. ISSN 2073-4395

Hasbullah, Nur Aainaa and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2020) Effects of amending phosphatic fertilizers with clinoptilolite zeolite on phosphorus availability and its fractionation in an acid soil. Applied Sciences, 10 (9). art. no. 3162. pp. 1-15. ISSN 2076-3417

Lim, Liza Nuriati Kim Choo and Ahmed, Osumanu Haruna and Nik Majid, Nik Muhamad and Ab Aziz, Zakry Fitri (2020) Improving nitrogen availability on a tropical peat soil cultivated with Ananas comosus L. Merr. using pineapple residue ash. Journal of Soil Science and Plant Nutrition, 20 (2). 657 - 672. ISSN 1436-8730; ESSN: 1522-2624

Omar, Latifah and Ahmed, Osumanu Haruna and Abdul Majid, Nik Muhamad (2020) Improving nutrient recovery of Zea Mays L. using paddy husk compost and clinoptilolite zeolite. Modern Environmental Science and Engineering, 6 (2). 235 - 246. ISSN 2333-2581

Tang, Amelia and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Jalloh, Mohamadu Boyie (2020) Potential PGPR properties of cellulolytic, nitrogen-fixing, phosphate-solubilizing bacteria in rehabilitated tropical forest soil. Microorganisms, 8 (3). art. no. 442. pp. 1-22. ISSN 2076-2607

Maru, Ali and Ahmed, Osumanu Haruna and Asap, Audrey and Nik Ab. Majid, Nik Muhamad and Maikol, Nathaniel and Jeffary, Alicia Vanessa (2020) Reducing acidity of tropical acid soil to improve phosphorus availability and Zea mays L. productivity through efficient use of chicken litter biochar and triple superphosphate. Applied Sciences, 10 (6). art. no. 2127. pp. 1-22. ISSN 2076-3417

Omar, Latifah and Ahmed, Osumanu Haruna and Jalloh, Mohamadu Boyie and Nik Muhamad, Abdul Majid (2020) Soil nitrogen fractions, Nitrogen use efficiency and yield of Zea mays L. Gown on a tropical acid soil treated with composts and clinoptilolite zeolite. Applied Sciences, 10 (12). pp. 1-16. ISSN 2076-3417

Lee, Yit Leng and Ahmed, Osumanu Haruna and Abdul Wahid, Samsuri and Abdul Razak, Norawanis and Zulkeple, Nurul Nadzirah and Ismail, Ras Izzati and Makhtar, Nur Lailina (2019) Characteristics and heating values of pellets made from raw and charred rice residues-rubber tree twigs mixture. IOP Conference Series: Materials Science and Engineering, 551. art. no. 012104. pp. 1-4. ISSN 1757-8981; ESSN: 1757-899X

Palanivell, Perumal and Ahmed, Osumanu Haruna and Omar, Latifah and Nik Ab. Majid, Nik Muhamad (2019) Economic viability of including humic substances, chicken litter biochar, and clinoptilolite zeolite in rice cultivation on acid soils. Bulgarian Journal of Agricultural Science, 25 (1). pp. 79-96. ISSN 1310-0351

Ariffin, Mohd Rizal and Ahmed, Osumanu Haruna and Md Isa, Isharudin and Khairuddin, Mohd Nizar (2019) Effects of moisture level on nitrogen availability in tropical peat soil cultivated with oil palm (Elaeis guineensis Jacq.). Agrivita Journal of Agricultural Science., 41 (1). pp. 166-174. ISSN 2302-6766 ESSN: 2477-8516

Rosli, Noraini and Gandaseca, Seca and James, Geoffery and Kueh, Roland Jui Heng and Ahmed, Osumanu Haruna and Idris, Mohd Hanafi and Mohamad Pazi, Ahmad Mustapha (2019) Quality of tropical river water in different catchments of canopy cover. The Malaysian Forester, 83 (1). pp. 128-148. ISSN 0302-2935

Sulok, Kevin Muyang Tawie and Ahmed, Osumanu Haruna and Choy, Yuen Khew and Mercer Zehnder, Jarroop Augustine (2018) Introducing natural farming in black pepper (Piper nigrum L.) cultivation. International Journal of Agronomy, 2018. pp. 1-6. ISSN 1687-8159, ESSN: 1687-8167

Omar, Latifah and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2017) Enhancing nitrogen availability, ammonium adsorption-desorption, and soil pH buffering capacity using composted paddy husk. Eurasian Soil Science, 50 (12). pp. 1483-1493. ISSN 1064-2293; ESSN: 1556-195X

Omar, Latifah and Ahmed, Osumanu Haruna and Abdul Majid, Nik Muhamad (2017) Enhancing nitrogen availability from urea using clinoptilolite zeolite. Geoderma, 306. pp. 152-159. ISSN 0016-7061; ESSN: 1872-6259

Kueh, Roland Jui Heng and Nik Ab. Majid, Nik Muhamad and Gandaseca, Seca and Ahmed, Osumanu Haruna and Jemat, Sylvester and Ku, Melvin Kin Kin and Teo, Jimmy Chee Kiong (2017) Evaluation of rehabilitated forest stands development using hemispheric photograph. Journal of Advanced Research Design, 36 (1). 25 - 33. ISSN 2289-7984

Mohd Rashid, Mohd Rakib and Bong, Joseph Choon Fah and Ahmad, Khairulmazmi and Abu Seman, Idris and Jalloh, Mohamadu Boyie and Ahmed, Osumanu Haruna (2017) Association of copper and zinc levels in oil palm (Elaeis guineensis) to the spatial distribution of Ganoderma species in the plantations on peat. Journal of Phytopathology, 165 (4). pp. 276-282. ISSN 0931-1785; ESSN: 1439-0434

Omar, Latifah and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2017) Enhancing nutrients use efficiency and grain yield of Zea mays L. cultivated on a tropical acid soil using paddy husk compost and clinoptilolite zeolite. Bulgarian Journal of Agricultural Science, 23 (3). 418 - 428. ISSN 1310-0351; ESSN: 2534-983X

Mohd Isa, Mohd Nor Ammar and Abd. Majid, Nik Muhamad and Hiroyuki, Sase and Ahmed, Osumanu Haruna and Kundat, Franklin Ragai and Kueh, Roland Jui Heng (2017) Epicuticular wax concentration on Syzygium myrtifolium leaves. IOSR Journal of Environmental Science, Toxicology and Food Technology, 11 (5 ver. 2). ISSN 2319-2399; ESSN: 2319-2402

Palanivell, Perumal and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2017) Minimizing ammonia volatilization from urea in waterlogged condition using chicken litter biochar. Communications in Soil Science and Plant Analysis, 48 (17). 2083 - 2092. ISSN 0010-3624; ESSN: 1532-2416

Latifah, Omar and Ahmed, Osumanu Haruna and Abdul Majid, Nik Muhamad (2017) Short term enhancement of nutrients availability in Zea mays L. cultivation on an acid soil using compost and clinoptilolite zeolite. Compost Science & Utilization, 25 (1). ISSN 1065-657X; ESSN: 2326-2397

Mundi, Morven and Mikal, Kathleen Michelle and Ahmed, Osumanu Haruna and Sarbini, Shahrul Razid (2017) A review on the effects of prebiotics on cell toxicity and integrity. International Journal of Food Properties, 20 (supp. 1). pp. 1-8. ISSN 1094-2912; ESSN: 1532-2386

Ch'ng, Huck Ywih and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhammad and Jalloh, Mohamadu Boyie (2016) Reducing soil phosphorus fixation to improve yield of maize on a tropical acid soil using compost and biochar derived from agro-industrial wastes. Compost Science & Utilization, 25 (2). pp. 82-94. ISSN 1065-657X; ESSN: 2326-2397

Kueh, Roland Jui Heng and Nik Majid, Nik Muhamad and Ahmed, Osumanu Haruna and Gandaseca, Seca (2016) Assessment of carbon stock in chronosequence rehabilitated tropical forest stands in Malaysia. Journal of Forest and Environmental Science, 32 (3). pp. 302-310. ISSN 2288-9752; ESSN: 2288-9744

Ch'ng, Huck Ywih and Ahmed, Osumanu Haruna and Nik Majid, Nik Muhamad (2016) Minimizing phosphorus sorption and leaching in a tropical acid soil using Egypt rock phosphate with organic amendments. Philippine Agricultural Scientist, 99 (2). pp. 176-185. ISSN 0031-7454

Jeffary, A. V. and Ahmed, Osumanu Haruna and Kueh, Roland Jui Heng and Choo, L. N. L. K. (2016) Horizontal and vertical emissions of methane from a drained tropical peat soil cultivated with Pineapple (Ananas comosus (L.) Merr.). International Journal of Biosciences, 9 (5). pp. 10-18. ISSN 2220-6655; ESSN: 2222-5234

Perumal, Palanivell and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2016) Minimizing ammonia volatilization from urea, improving lowland rice (cv. MR219) seed germination, plant growth variables, nutrient uptake, and nutrient recovery using clinoptilolite zeolite. Archives of Agronomy and Soil Science, 62 (5). pp. 708-724. ISSN 0365-0340; ESSN: 1476-3567

Hoque, Mohammed Muzammel and Mustafa Kamal, Abu Hena and Ahmed, Osumanu Haruna and Idris, Mohd Hanafi and Hoque, A. T. M. Rafiqul and Billah, Md. Masum (2015) Can mangroves help combat sea level rise through sediment accretion and accumulation? Malaysian Journal of Science, 34 (1). pp. 78-86. ISSN 0126-7906

Omar, Latifah and Ahmed, Osumanu Haruna and Kassim, Susilawati and Majid, Nik Muhamad (2015) Compost maturity and nitrogen availability by co-composting of paddy husk and chicken manure amended with clinoptilolite zeolite. Waste Management & Research, 33 (4). pp. 322-331. ISSN 0734-242X; ESSN: 1096-3669

Hasbullah, Nur Aainaa and Ahmed, Osumanu Haruna and Kasim, Susilawati and Ab. Majid, Nik Muhamad (2015) Reducing Egypt rock phosphate use in Zea mays cultivation on an acid soil using clinoptilolite zeolite. Sustainable Agriculture Research, 4 (1). pp. 56-66. ISSN 1927-050X; ESSN: 1927-0518

Hun, K. S. and Balasundram, Siva K. and Anuar, Abdul Rahim and Ahmed, Osumanu Haruna and Aminuddin, Hussin (2015) Response of irrigated direct-seeded rice yields to different nitrogen rates and precipitation patterns. International Journal of Tropical Agriculture, 33 (2 pt. 1). pp. 565-570. ISSN 0254-8755

Arianto, Chandra Iman and Gandaseca, Seca and Rosli, Noraini and Mohamad Pazi, Ahmad Mustapha and Ahmed, Osumanu Haruna and Abdul Hamid, Hazandy and Abdul Majid, Nik Muhamad (2015) Soil carbon storage in dominant species of mangrove forest of Sarawak, Malaysia. International Journal of Physical Sciences, 10 (6). art. no. 586614F51664. pp. 210-214. ISSN 1992-1950

Hoque, Mohammed Muzammel and Mustafa Kamal, Abu Hena and Idris, Mohd Hanafi and Ahmed, Osumanu Haruna and Saifullah, A. S. M. and Billah, Md. Masum (2015) Status of some fishery resources in a tropical mangrove estuary of Sarawak, Malaysia. Marine Biology Research, 11 (8). pp. 834-846. ISSN 1745-1000; ESSN: 1745-1019

Ch'ng, Huck Ywih and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2014) Biochar and compost influence the phosphorus availability, nutrients uptake, and growth of maize (Zea mays L.) in tropical acid soil. Pakistan Journal of Agricultural Sciences, 51 (4). pp. 797-806. ISSN 0552-9034; ESSN: 2076-0906

Abdullahi, N. and Bujang, Japar Sidik and Ahmed, Osumanu Haruna and Zakaria @ Ya, Muta Harah (2014) Effect of polythene-covering on above-ground tuberization and storage roots yield in cassava (Manihot esculenta Crantz). Journal of Experimental Biology and Agricultural Sciences, 2 (1). pp. 37-42. ISSN 2320-8694

Abdullahi, N. and Bujang, Japar Sidik and Ahmed, Osumanu Haruna and Zakaria @ Ya, Muta Harah (2014) Effect of planting methods on growth and yield of cassava (Manihot esculenta Crantz) grown with polythene-covering. Journal of Experimental Biology and Agricultural Sciences, 1 (7). pp. 480-487. ISSN 2320-8694

Gandaseca, Seca and Salimin, Muhamad Ismawi and Ahmed, Osumanu Haruna (2014) Effect of cultivation in different age’s oil palm plantation on selected chemical properties of peat swamp soils. Agriculture, Forestry and Fisheries, 3 (6-1). pp. 6-9. ISSN 2328-563X; ESSN: 2328-5648

Ch'ng, Huck Ywih and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2014) Improving phosphorus availability in an acid soil using organic amendments produced from agroindustrial wastes. The Scientific World Journal, 2014. art. no. 506356. pp. 1-6. ISSN 2356-6140; ESSN: 1537-744X

Abdul Aziz, Zakry Fitri and Mohd Saud, Halimi and Abdul Rahim, Khairuddin and Ahmed, Osumanu Haruna (2014) In silico protein prediction of the 16S ribosomal RNA gene from novel rhizobacterium Bacillus cereus UPMLH24. Journal of Pure and Applied Microbiology, 8 (4). pp. 2801-2816. ISSN 0973-7510

Bah, Alagie and Mohd Hanif, Ahmad Husni and Teh, Christopher Boon Sung and Yusop, Mohd Rafii and Syed Rastan, Syed Omar and Ahmed, Osumanu Haruna (2014) Reducing runoff loss of applied nutrients in oil palm cultivation using controlled-release fertilizers. Advances in Agriculture, 2014. art. no. 285387. pp. 1-9. ISSN 2356-654X; ESSN: 2314-7539

Hasbullah, Nor Aainaa and Ahmed, Osumanu Haruna and Kasim, Susilawati and Nik Ab. Majid, Nik Muhamad (2014) Use of clinoptilolite zeolite on selected soil chemical properties, dry matter production, nutrients uptake and use efficiency of Zea mays cultivated on an acid soil. International Journal of Agricultural Research, 9 (3). pp. 136-148. ISSN 1816-4897; ESSN: 2152-2553

Hasbullah, Nur Aainaa and Ahmed, Osumanu Haruna and Kasim, Susilawati and Nik Ab. Majid, Nik Muhamad (2014) Use of clinoptilolite zeolite to reduce Christmas Island rock phosphate use Zea mays cultivation on an acid soil. International Journal of Soil Science, 9 (2). pp. 55-66. ISSN 1816-4978

Ibrahim, Mohamad Hilmi and Kasim, Susilawati and Ahmed, Osumanu Haruna and Nik Abd Majid, Nik Muhamad (2013) Effects of simulated acid rain on Shorea macroptera growth and selected soil chemical properties. African Journal of Agricultural Research, 8 (15). art. no. 0C8FC2035231. pp. 1280-1289. ISSN 1991-637X

Kueh, Roland Jui Heng and Nik Abd Majid, Nik Muhamad and Gandaseca, Seca and Ahmed, Osumanu Haruna (2013) Above ground biomass-carbon partitioning, storage and sequestration in a rehabilitated forest, Bintulu, Sarawak, Malaysia. Sains Malaysiana, 42 (8). pp. 1041-1050. ISSN 0026-6039

Edward, Edkona Jenang and Wong, Sing King and Leong, Stephen Chan Teck and Jiwan, Make and Ab. Aziz, Zakry Fitri and Kundat, Franklin Ragai and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2013) Antagonistic activities of endophytic bacteria against Fusarium wilt of black pepper (Piper nigrum). International Journal of Agriculture and Biology, 15 (2). pp. 291-296. ISSN 1560-8530; ESSN: 1814-9596

Kueh, Roland Jui Heng and Nik Ab. Majid, Nik Muhamad and Gandaseca, Seca and Ahmed, Osumanu Haruna and Jemat, Silvester and Ku, Melvin Kin Kin (2013) Assessment of floristic composition in a rehabilitated forest, Sarawak, Malaysia. Borneo Journal of Resource Science and Technology, 2 (2). pp. 60-66. ISSN 2229-9769

Ch'ng, Huck Ywih and Ahmed, Osumanu Haruna and Kasim, Susilawati and Nik Ab. Majid, Nik Muhamad (2013) Co-composting of pineapple leaves and chicken manure slurry. International Journal of Recycling of Organic Waste in Agriculture, 2. art. no. 23. pp. 1-8. ISSN 2195-3228; ESSN: 2251-7715

Perumal, Palanivell and Kasim, Susilawati and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2013) Compost and crude humic substances produced from selected wastes and their effects on Zea mays l. nutrient uptake and growth. The Scientific World Journal, 2013. art. no. 276235. pp. 1-15. ISSN 2356-6140; ESSN: 1537-744X

Perumal, Palanivell and Kasim, Susilawati and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2013) Effects of crude humin and compost produced from selected waste on Zea mays growth, nutrient uptake and nutrient use efficiency. African Journal of Biotechnology, 12 (13). art. no. ADC199B26054. pp. 1500-1507. ISSN 1684–5315

Basri, Mohd Hadi Akbar and Abdu, Arifin and Jusop, Shamsuddin and Ahmed, Osumanu Haruna and Abdul Hamid, Hazandy and Kusno, Mohd Ashadie and Zainal, Baharom and Senin, Abdul Latib and Junejo, Nasima (2013) Effects of mixed organic and inorganic fertilizers application on soil properties and the growth of kenaf (Hibiscus cannabinus L.) cultivated on BRIS soils. American Journal of Applied Sciences, 10 (12). pp. 1586-1597. ISSN 1546-9239; ESSN: 1554-3641

Jol, Hamdan and Ahmed, Osumanu Haruna (2013) Potassium dynamics of a forest soil developed on a weathered schist regolith. Archives of Agronomy and Soil Science, 59 (4). pp. 593-602. ISSN 0365-0340; ESSN: 1476-3567

Abdullahi, N. and Bujang, Japar Sidik and Ahmed, Osumanu Haruna and Zakaria @ Ya, Muta Harah (2013) Variability on growth and storage roots yield in cassava under three planting methods. Agricultural Journal, 8 (6). pp. 289-294. ISSN 1816-9155; ESSN: 1994-4616

Perumal, Palanivell and Kasim, Susilawati and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2012) Effect of humin-urea-rock phosphate amendment on Bekenu series (Tipik Tualemkuts) soil. African Journal of Biotechnology, 11 (45). art. no. 908817931240. pp. 10317-10321. ISSN 1684–5315

Ahmed, Osumanu Haruna and Shamsuddin, Rosliza and Nik Ab. Majid, Nik Muhamad and Jalloh, Mohamadu Boyie (2012) Effect of N, P and K humates on dry matter of Zea mays and soil pH, exchangeable ammonium and available nitrate. African Journal of Biotechnology, 11 (40). art. no. 76C1C1039752. pp. 9566-9571. ISSN 1684–5315

Perumal, Palanivell and Kasim, Susilawati and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2012) Effects of extraction period on yield of rice straw compost humic acids. African Journal of Biotechnology, 11 (20). art. no. B6C0DF034011. pp. 4530-4536. ISSN 1684–5315

Kueh, Roland Jui Heng and Nik Ab. Majid, Nik Muhamad and Gandaseca, Seca and Ahmed, Osumanu Haruna and Ku, Melvin Kin Kin (2012) Assessment of micrometeorology at selected age stands in a rehabilitated forest of Sarawak, Malaysia. Journal of Tropical Biology and Conservation, 9 (1). pp. 83-95. ISSN 1823-3902

Chen, Guan Pau and Chan, Stephen Teck Leong and Wong, Sing King and Eng, Lily and Jiwan, Make and Ragai Kundat, Franklin and Ab. Aziz, Zakry Fitri and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2012) Isolation of indigenous strains of Paecilomyces lilacinus with antagonistic activity Meloidogyne incognita. International Journal of Agriculture and Biology, 14 (2). pp. 197-203. ISSN 1560-8530; ESSN: 1814–9596

Awing, Norida Hanim and Nik Ab. Majid, Nik Muhamad and Ahmed, Osumanu Haruna and Kasim, Susilawati and Ahmad, Khairulmazmi (2012) Physico-chemical properties of indigenous micro organism-composts and humic acid prepared from selected agro-industrial residues. African Journal of Biotechnology, 11 (34). art. no. 7CA621D37651. pp. 8456-8463. ISSN 1684–5315

Ab. Aziz, Zakry Fitri and Mohd Saud, Halimi and Abdul Rahim, Khairuddin and Ahmed, Osumanu Haruna (2012) Variable responses on early development of shallot (Allium ascalonicum) and mustard (Brassica juncea) plants to Bacillus cereus inoculation. Malaysian Journal of Microbiology, 8 (1). pp. 47-50. ISSN 1823-8262; ESSN: 2231-7538

Keen, Yeoh Chooi and Jalloh, Mohamadu Boyie and Ahmed, Osumanu Haruna and Sudin, Mahmud and Awang Besar, Normah (2011) Soil organic matter and related soil properties in forest, grassland and cultivated land use types. International Journal of the Physical Sciences, 6 (32). pp. 7410-7415. ISSN 1992-1950

Ch’ng, Huck Ywih and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2011) Assessment of soil carbon storage in a tropical rehabilitated forest. International Journal of the Physical Sciences, 6 (26). pp. 6210-6219. ISSN 1992-1950

Omar, Latifah and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2011) Effect of mixing urea with zeolite and sago waste water on nutrient use efficiency of maize (Zea mays L.). African Journal of Microbiology Research, 5 (21). art. no. BB73FC413149. pp. 3462-3467. ISSN 1996-0808

Firdaus, Mohd Suffian and Gandaseca, Seca and Ahmed, Osumanu Haruna (2011) Effect of drainage and land clearing on selected peat soil physical properties of secondary peat swamp forest. International Journal of the Physical Sciences, 6 (23). pp. 5462-5466. ISSN 1992-1950

Mohd Yusuff, Mohd Taufik and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2011) Ammonia loss reduction, exchangeable ammonium and available nitrate retention in soil treated with urea mixed with humic acid and acid sulphate soil. International Journal of the Physical Sciences, 6 (21). pp. 4897-4902. ISSN 1992-1950

Mohd Yusuff, Mohd Taufik and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2011) Effect of amending urea with humic acids and acid sulphate on biomass production of Masmadu (Zea mays L.) and selected soil chemical properties. International Journal of the Physical Sciences, 6 (20). pp. 4690-4694. ISSN 1992-1950

Omar, Latifah and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2011) Enhancing nutrient use efficiency of maize (Zea mays L.) from mixing urea with zeolite and peat soil water. International Journal of the Physical Sciences, 6 (14). pp. 3330-3335. ISSN 1992-1950

Omar, Latifah and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2011) Ammonia loss, soil exchangeable ammonium and available nitrate contents from mixing urea with zeolite and peat soil water under non-waterlogged condition. International Journal of the Physical Sciences, 6 (12). pp. 2916-2920. ISSN 1992-1950

Omar, Latifah and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2011) Ammonia loss, ammonium and nitrate accumulation from mixing urea with zeolite and peat soil water under waterlogged condition. African Journal of Biotechnology, 10 (17). art. no. 894B6A930518. pp. 3365-3369. ISSN 1684–5315

Omar, Latifah and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2011) Reducing ammonia loss from urea and improving soil exchangeable ammonium and available nitrate in non waterlogged soils through mixing zeolite and sago (Metroxylon sagu) waste water. International Journal of the Physical Sciences, 6 (4). pp. 866-870. ISSN 1992-1950

Bundan, Latip and Nik Ab. Majid, Nik Muhamad and Ahmed, Osumanu Haruna and Jiwan, Make and Ragai Kundat, Franklin (2011) Ammonia volatilization from urea at different levels of zeolite. International Journal of the Physical Sciences, 6 (34). pp. 7717-7720. ISSN 1992-1950

Ku, Melvin Kin Kin and Bujang, Japar Sidik and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Kueh, Roland Jui Heng and Jemat, Silvester (2011) Comparison of carbon and selected macronutrients in forest-floor litter of rehabilitated and secondary forests. American Journal of Applied Sciences, 8 (10). pp. 967-972. ISSN 1546-9239; ESSN: 1554-3641

Mat Nuri, Ahmad Shukri and Gandaseca, Seca and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2011) Effect of tropical peat swamp forest clearing on soil carbon storage. American Journal of Agricultural and Biological Sciences, 6 (1). pp. 80-83. ISSN 1557-4989; ESSN: 1557-4997

Kasim, Susilawati and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2011) Effectiveness of liquid organic-nitrogen fertilizer in enhancing nutrients uptake and use efficiency in corn (Zea mays). African Journal of Biotechnology, 10 (12). art. no. 8BCF3D032015. pp. 2274-2281. ISSN 1684–5315

Kueh, Roland Jui Heng and Nik Ab. Majid, Nik Muhamad and Gandaseca, Seca and Ahmed, Osumanu Haruna and Jemat, Silvester and Ku, Melvin Kin Kin (2011) Forest structure assessment of a rehabilitated forest. American Journal of Agricultural and Biological Sciences, 6 (2). pp. 256-260. ISSN 1557-4989; ESSN: 1557-4997

Yahya, Zuraidah and Husin, Aminuddin and Talib, Jamal and Othman, Jamarei and Darus, Siti Zauyah and Ahmed, Osumanu Haruna and Jalloh, Mohamadu Boyie (2011) Pores reconfiguration in compacted Bernam series soil. American Journal of Applied Sciences, 8 (3). pp. 212-216. ISSN 1546-9239; ESSN: 1554-3641

Huck, Ywih Ch'ng and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2011) Qualitative assessment of soil carbon in a rehabilitated forest using Fourier transform infrared spectroscopy. The Scientific World Journal, 11 (1). pp. 532-545. ISSN 1537-744X

Bernard, Regis and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2011) Utilization of activated carbon produced from Sago hampas (Metroxylon sagu) to reduce ammonia loss from urea. International Journal of the Physical Sciences, 6 (25). pp. 6140-6146. ISSN 1992-1950

Ahmed, Osumanu Haruna and Yap, Braine C. H. and Nik Ab. Majid, Nik Muhamad (2010) Minimizing ammonia loss from urea through mixing with zeolite and acid sulphate soil. International Journal of the Physical Sciences, 5 (14). pp. 2198-2202. ISSN 1992-1950

Salimin, Muhamad Ismawi and Gandaseca, Seca and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2010) Comparison of selected chemical properties of peat swamp soil before and after timber harvesting. American Journal of Environmental Sciences, 6 (2). pp. 164-167. ISSN 1553-345X; ESSN: 1558-3910

Ahmed, Osumanu Haruna and Hasbullah, Nur Aainaa and Nik Ab. Majid, Nik Muhamad (2010) Accumulation of soil carbon and phosphorus contents of a rehabilitated forest. The Scientific World Journal, 10. pp. 1988-1995. ISSN 1537-744X

Rambok, Empi and Gandaseca, Seca and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2010) Comparison of selected soil chemical properties of two different mangrove forests in Sarawak. American Journal of Environmental Sciences, 6 (5). pp. 438-441. ISSN 1553-345X; ESSN: 1558-3910

Basri, Mohd Hadi Akbar and Ahmed, Osumanu Haruna and Jamaluddin, Aiza Shaliha and Nik Ab. Majid, Nik Muhamad and Abdul Hamid, Hazandy and Jusop, Shamsuddin and Hassan, Affendy and Yusof, K. H. and Abdu, Arifin (2010) Differences in soil physical and chemical properties of rehabilitated and secondary forests. American Journal of Applied Sciences, 7 (9). pp. 1200-1209. ISSN 1546-9239; ESSN: 1554-3641

Petrus, Auldry Chaddy and Ahmed, Osumanu Haruna (2010) Effect of K-N-humates on dry matter production and nutrient use efficiency of maize in Sarawak, Malaysia. The Scientific World Journal, 10. pp. 1282-1292. ISSN ESSN: 1537-744X

Firdaus, Mohd Suffian and Gandaseca, Seca and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2010) Effect of converting secondary tropical peat swamp forest into oil palm plantation on selected peat soil physical properties. American Journal of Environmental Sciences, 6 (4). pp. 402-405. ISSN 1553-345X; ESSN: 1558-3910

Lee, Jia Huey and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2010) Effects of extractants on the yields and selected chemical characteristics of humic acids isolated from tropical saprists peat. American Journal of Applied Sciences, 7 (7). pp. 933-936. ISSN 1546-9239; ESSN: 1554-3641

Kundat, Franklin Ragai and Loo, Hoong Shen and Ahmed, Osumanu Haruna (2010) Incorporation of bentazone with Exserohilum rostratum for controlling Cyperus iria. American Journal of Agricultural and Biological Sciences, 5 (2). pp. 210-214. ISSN 1557-4989; ESSN: 1557-4997

Omar, Latifah and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2010) Minimizing ammonia volatilization in waterlogged soils through mixing of urea with zeolite and sago waste water. International Journal of the Physical Sciences, 5 (14). pp. 2193-2197. ISSN 1992-1950

Yahya, Zuraidah and Hussin, Aminuddin and Talib, Jamal and Othman, Jamarei and Ahmed, Osumanu Haruna and Jalloh, Mohamadu Boyie (2010) Oil palm (Elaeis guineensis) roots response to mechanization in Bernam series soil. American Journal of Applied Sciences, 7 (3). pp. 343-348. ISSN 1546-9239; ESSN: 1554-3641

Saga, B. T. and Ahmed, Osumanu Haruna and Jamaluddin, Aiza Shaliha and Abdul Hamid, Hazandy and Jusop, Shamshuddin and Nik Ab. Majid, Nik Muhamad and Hassan, Affendy and Yusof, K. H. and Abdu, Arifin (2010) Selected soil morphological, mineralogical and sesquioxide properties of rehabilitated and secondary forests. American Journal of Environmental Sciences, 6 (4). pp. 389-394. ISSN 1553-345X; ESSN: 1558-3910

Yahya, Zuraidah and Husin, Aminuddin and Talib, Jamal and Othman, Jamarei and Ahmed, Osumanu Haruna and Jalloh, Mohamadu Boyie (2010) Soil compaction and oil palm (Elaeis guineensis) yield in a clay textured soil. American Journal of Agricultural and Biological Sciences, 5 (1). pp. 15-19. ISSN 1557-4989; ESSN: 1557-4997

Ahmed, Osumanu Haruna and G., Sumalatha and Nik Ab. Majid, Nik Muhamad (2010) Use of zeolite in maize (Zea mays) cultivation on nitrogen, potassium, and phosphorus uptake and use efficiency. International Journal of the Physical Sciences, 5 (15). pp. 2393-2401. ISSN 1992-1950

Satrio, Anton Eko and Gandaseca, Seca and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2009) Effect of logging operation on soil carbon storage of a tropical peat swamp forest. American Journal of Environmental Sciences, 5 (6). pp. 748-752. ISSN 1553-345X; ESSN: 1558-3910

Jalloh, Mohamadu Boyie and Wan Harun, Wan Sulaiman and Talib, Jamal and Ramlan, Mohd Fauzi and Amarthalingam, Rajan and Teh, Christopher Boon Sung and Ahmed, Osumanu Haruna (2009) A simulation model estimates of the intercropping advantage of an immature-rubber, banana and pineapple system. American Journal of Agricultural and Biological Sciences, 4 (3). pp. 249-254. ISSN 1557-4989; ESSN: 1557-4997

Petrus Rudut, Auldry Chaddy and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Hassan, Mohammad Nasir and Jiwan, Make and Banta, Michael Gregory (2009) Chemical characteristics of compost and humic acid from sago waste (Metroxylon sagu). American Journal of Applied Sciences, 6 (11). pp. 1880-1884. ISSN 1546-9239; ESSN: 1554-3641

Shamsuddin, Rosliza and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2009) Controlling ammonia volatilization by mixing urea with humic acid, fulvic acid, triple superphosphate and muriate of potash. American Journal of Environmental Sciences, 5 (5). pp. 605-609. ISSN 1553-345X; ESSN: 1558-3910

Murugayah, Rajeswari and Gandaseca, Seca and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2009) Effect of different ages of a rehabilitated forest on selected physico-chemical properties. American Journal of Applied Sciences, 6 (6). pp. 1043-1046. ISSN 1546-9239; ESSN: 1554-3641

Mohd Yusuff, Mohd Taufik and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2009) Effect of enhancing urea-humic acid mixture with refined acid sulphate soil. American Journal of Applied Sciences, 6 (11). pp. 1892-1896. ISSN 1546-9239; ESSN: 1554-3641

Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Jalloh, Mohamadu Boyie (2009) Effect of grain size on selected physico-chemical properties of clay. American Journal of Environmental Sciences, 5 (5). pp. 610-612. ISSN 1553-345X; ESSN: 1558-3910

Mohd Yusuff, Mohd Taufik and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2009) Effect of mixing urea with humic acid and acid sulphate soil on ammonia loss, exchangeable ammonium and available nitrate. American Journal of Environmental Sciences, 5 (5). pp. 588-591. ISSN 1553-345X; ESSN: 1558-3910

Kasim, Susilawati and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Yusop, Mohd Khanif and Jalloh, Mohamadu Boyie (2009) Effect of organic based N fertilizer on dry matter (Zea mays L.), ammonium and nitrate recovery in an acid soil of Sarawak, Malaysia. American Journal of Applied Sciences, 6 (7). pp. 1289-1294. ISSN 1546-9239; ESSN: 1554-3641

Satrio, Anton Eko and Gandaseca, Seca and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2009) Effect of precipitation fluctuation on soil carbon storage of a tropical peat swamp forest. American Journal of Applied Sciences, 6 (8). pp. 1484-1488. ISSN 1546-9239; ESSN: 1554-3641

Satrio, Anton Eko and Gandaseca, Seca and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2009) Effect of skidding operations on soil carbon storage of a tropical peat swamp forest. American Journal of Environmental Sciences, 5 (6). pp. 722-726. ISSN 1553-345X; ESSN: 1558-3910

Ch'ng, Huck Ywih and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Jalloh, Mohamadu Boyie (2009) Effects of converting secondary forest on tropical peat soil to oil palm plantation on carbon storage. American Journal of Agricultural and Biological Sciences, 4 (2). pp. 123-130. ISSN 1557-4989; ESSN: 1557-4997

Ch'ng, Huck Ywih and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Jalloh, Mohamadu Boyie (2009) Effects of converting secondary forest on tropical peat soil to oil plantation on carbon storage. American Journal of Agricultural and Biological Sciences, 4 (2). pp. 123-130. ISSN 1557-4989; ESSN: 1557-4997

Muniandy, Makilan and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Yusop, Mohd Khanif (2009) Effects of converting secondary forest to oil palm plantation on peat soil carbon and nitrogen and other soil chemical properties. American Journal of Environmental Sciences, 5 (3). pp. 406-412. ISSN 1553-345X; ESSN: 1558-3910

Ahmed, Osumanu Haruna and Hussin, Aminuddin and Mohd Hanif, Ahmad Husni and Jalloh, Mohamadu Boyie and Abd Rahim, Anuar and Nik Ab. Majid, Nik Muhamad (2009) Enhancing the urea-N use efficiency in maize (Zea mays) cultivation on acid soils using urea amended with zeolite and TSP. American Journal of Applied Sciences, 6 (5). pp. 829-833. ISSN 1546-9239; ESSN: 1554-3641

Satrio, Anton Eko and Gandaseca, Seca and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2009) Influence of chemical properties on soil carbon storage of a tropical peat swamp forest. American Journal of Applied Sciences, 6 (11). pp. 1969-1972. ISSN 1546-9239; ESSN: 1554-3641

Yahya, Zuraidah and Hussin, Aminuddin and Talib, Jamal and Othman, Jamarei and Ahmed, Osumanu Haruna and Jalloh, Mohamadu Boyie (2009) Machinery compaction effects on physical properties of Bernam series in an oil palm plantation. American Journal of Applied Sciences, 6 (12). pp. 2006-2009. ISSN 1546-9239; ESSN: 1554-3641

Lee, Yit Leng and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Jalloh, Mohamadu Boyie (2009) Organic matter, carbon and humic acids in rehabilitated and secondary forest soils. American Journal of Applied Sciences, 6 (5). pp. 824-828. ISSN 1546-9239; ESSN: 1554-3641

Petrus Rudut, Auldry Chaddy and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Hassan, Mohammad Nasir and Jiwan, Make (2009) Production of potassium and calcium hydroxide, compost and humic acid from sago (Metroxylon sagu) waste. American Journal of Environmental Sciences, 5 (5). pp. 664-668. ISSN 1553-345X; ESSN: 1558-3910

Abdul Reeza, Ameera and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Jalloh, Mohamadu Boyie (2009) Reducing ammonia loss from urea by mixing with humic and fulvic acids isolated from coal. American Journal of Environmental Sciences, 5 (3). pp. 420-426. ISSN 1553-345X; ESSN: 1558-3910

Kasim, Susilawati and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Yusop, Mohd Khanif and Jalloh, Mohamadu Boyie (2009) Reduction of ammonia loss by mixing urea with liquid humic and fulvic acids isolated from tropical peat soil. American Journal of Agricultural and Biological Sciences, 4 (1). pp. 18-23. ISSN 1557-4989; ESSN: 1557-4997

Bernard, Regis and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Jalloh, Mohamadu Boyie (2009) Reduction of ammonia loss from urea through mixing with humic acids isolated from peat soil (saprists). American Journal of Environmental Sciences, 5 (3). pp. 393-397. ISSN 1553-345X; ESSN: 1558-3910

Shamsuddin, Rosliza and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Jalloh, Mohamadu Boyie (2009) Reduction of ammonia volatilization through mixing urea with humic and fulvic acids isolated from palm oil mill effluent sludge. American Journal of Environmental Sciences, 5 (3). pp. 382-386. ISSN 1553-345X; ESSN: 1558-3910

Chen, Claudia Hui Hui and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Jalloh, Mohamadu Boyie (2009) Reduction of isolation period of coal humic acids. American Journal of Applied Sciences, 6 (7). pp. 1327-1330. ISSN 1546-9239; ESSN: 1554-3641

Shamsuddin, Rosliza and Ahmed, Osumanu Haruna and Kasim, Susilawati and Nik Ab. Majid, Nik Muhamad and Jalloh, Mohamadu Boyie (2009) Simple and rapid method of isolating humic acids from tropical peat soils (Saprists). American Journal of Applied Sciences, 6 (5). pp. 820-823. ISSN 1546-9239; ESSN: 1554-3641

Law, M. C. and Balasundram, Siva Kumar and Mohd Hanif, Ahmad Husni and Ahmed, Osumanu Haruna and Harun, Mohd Haniff (2009) Spatial variability of soil organic carbon in oil palm. International Journal of Soil Science, 4 (4). pp. 93-103. ISSN 1816-4978

Law, M. C. and Balasundram, Siva Kumar and Mohd Hanif, Ahmad Husni and Ahmed, Osumanu Haruna and Harun, Mohd Haniff (2009) Spatial variability of soil organic carbon in oil palm: a comparison between young and mature stands. International Journal of Agricultural Research, 4 (12). pp. 402-417. ISSN 1816-4897; ESSN: 2152-2553

Gandaseca, Seca and Sabang, John and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2009) Vegetation assessment of peat swamp forest using remote sensing. American Journal of Agricultural and Biological Sciences, 4 (2). pp. 167-172. ISSN 1557-4989; ESSN: 1557-4997

Balasundram, Siva Kumar and Mohd Hanif, Ahmad Husni and Ahmed, Osumanu Haruna (2008) Application of Geostatistical Tools to Quantify Spatial Variability of Selected Soil Chemical Properties From a Cultivated Tropical Peat. Journal of Agronomy, 7 (1). pp. 82-87. ISSN 1812-5379

Mohd Ramzan, Nor Hanisah and Ahmed, Osumanu Haruna and Kasim, Susilawati and Nik Ab. Majid, Nik Muhamad and Jalloh, Mohamadu Boyie (2008) Determination of minimal duration essential for isolation of humic acids from soils in forest restoration programmes. American Journal of Agricultural and Biological Sciences, 3 (3). pp. 597-601. ISSN 1557-4989; ESSN: 1557-4997

Ahmed, Osumanu Haruna and Hussin, Aminuddin and Mohd Hanif, Ahmad Husni and Abdul Rahim, Anuar and Nik Ab. Majid, Nik Muhamad (2008) Enhancing the urea-N use efficiency in maize (Zea mays) cultivation on acid soils amended with zeolite and TSP. The Scientific World Journal, 8. pp. 394-399. ISSN 1537-744X

Omar, Shairul Rizdiyandi and Ahmed, Osumanu Haruna and Saamin, Shaharudin and Nik Ab. Majid, Nik Muhamad (2008) Gamma radiosensitivity study on chili (Capsicum annuum). American Journal of Applied Sciences, 5 (2). pp. 67-70. ISSN 1546-9239; ESSN: 1554-3641

Kasim, Susilawati and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Yusop, Mohd Khanif (2008) Simple method of purifying humic acids isolated from tropical hemists (peat soil). American Journal of Applied Sciences, 5 (12). pp. 1812-1815. ISSN 1546-9239; ESSN: 1554-3641

Abdul Rahim, Anuar and Kah, Joh Goh and Tee, Bee Heoh and Ahmed, Osumanu Haruna (2008) Spatial variability of soil inorganic N in a mature oil palm plantation in Sabah, Malaysia. American Journal of Applied Sciences, 5 (9). pp. 1239-1246. ISSN 1546-9239; ESSN: 1554-3641

Abdul Rahim, Anuar and Kah, Joh Goh and Tee, Bee Heoh and Ahmed, Osumanu Haruna (2008) Spatial-temporal yield trend of oil palm as influenced by nitrogen fertilizer management. American Journal of Applied Sciences, 5 (10). pp. 1376-1383. ISSN 1546-9239; ESSN: 1554-3641

Abdul Rahim, Anuar and Kah, Joh Goh and Tee, Bee Heoh and Ahmed, Osumanu Haruna (2008) Transforming spatio-temporal yield maps to classified management zone maps for efficient management of oil palm. American Journal of Applied Sciences, 5 (10). pp. 1392-1396. ISSN 1546-9239; ESSN: 1554-3641

Ahmed, Osumanu Haruna and Mohd Hanif, Ahmad Husni and Musa, Mohamed Hanafi and Abd Rahim, Anuar and Syed Rastan, Syed Omar (2007) Phosphorus fertilizer use in pineapple cultivation with in situ residues burning on organic soils. Communications in Soil Science and Plant Analysis, 38 (9-10). pp. 1243-1254. ISSN 0010-3624

Mohd Yusuff, Mohd Taufik and Ahmed, Osumanu Haruna and Wan Yahaya, Wan Asrina and Nik Ab. Majid, Nik Muhamad (2007) Effect of organic and inorganic fertilizers on nitrogen and potassium uptake and yield of sweet corn grown on an acid soil. American Journal of Agricultural and Biological Sciences, 2 (2). pp. 118-122. ISSN 1557-4989; ESSN: 1557-4997

Kasim, Susilawati and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Yusop, Mohd Khanif (2007) Effects of extraction and fractionation period on the yield of a tropical peat soil (Hemists) humic acids. American Journal of Agricultural and Biological Sciences, 2 (3). pp. 202-205. ISSN 1557-4989; ESSN: 1557-4997

Mohd Yusob, Shajarutulwardah and Ahmed, Osumanu Haruna and Wan Yahaya, Wan Asrina and Nik Ab. Majid, Nik Muhamad (2007) Evaluation of nitrogen and potassium uptake and efficiency of two rice varieties cultivated on an acid soil. American Journal of Agricultural and Biological Sciences, 2 (3). pp. 130-135. ISSN 1557-4989; ESSN: 1557-4997

Kon, Ellyfa and Ahmed, Osumanu Haruna and Saamin, Shaharudin and Nik Ab. Majid, Nik Muhamad (2007) Gamma radiosensitivity study on long bean (Vigna sesquipedalis). American Journal of Applied Sciences, 4 (12). pp. 1090-1093. ISSN 1546-9239; ESSN: 1554-3641

Ahmed, Osumanu Haruna and Mohd Hanif, Ahmad Husni and Musa, Mohamed Hanafi and Abd Rahim, Anuar and Syed Rastan, Syed Omar (2006) Leaching losses of soil applied potassium fertiliser in pineapple(Ananas comosus)cultivation on tropical peat soils in Malaysia. New Zealand Journal of Crop and Horticultural Science, 34 (2). pp. 155-161. ISSN 0114-0671

Ahmed, Osumanu Haruna and Mohd Hanif, Ahmad Husni and Abd Rahim, Anuar and Musa, Mohamed Hanafi (2005) Effects of extraction and fractionation time on the yield of compost humic acids. New Zealand Journal of Crop and Horticultural Science, 33 (2). pp. 107-110. ISSN 0114-0671

Ahmed, Osumanu Haruna and Mohd Hanif, Ahmad Husni and Abd. Rahim, Anuar and Musa, Mohamed Hanafi and De Silva, Angela Ee (2005) A modified way of producing humic acid from composted pineapple leaves. Journal of Sustainable Agriculture, 25 (1). pp. 129-139. ISSN 1044-0046

Ahmed, Osumanu Haruna and Mohd Hanif, Ahmad Husni and Abd. Rahim, Anuar and Musa, Mohamed Hanafi (2003) Economic viability of pineapple residues recycling. Journal of Sustainable Agriculture, 21 (4). pp. 129-137. ISSN 1044-0046

Ahmed, Osumanu Haruna and Mohd Hanif, Ahmad Husni and Abd Rahim, Anuar and Musa, Mohamed Hanafi (2003) Production of humic acid from pineapple leaf residue. Journal of Sustainable Agriculture, 22 (1). pp. 113-124. ISSN 1044-0046

Ahmed, Osumanu Haruna and Mohd Hanif, Ahmad Husni and Abd Rahim, Anuar and Musa, Mohamed Hanafi (2002) Effect of residue management practices on yield and economic viability of Malaysian pineapple production. Journal of Sustainable Agriculture, 20 (4). pp. 83-94. ISSN 1044-0046

Ahmed, Osumanu Haruna and Mohd Hanif, Ahmad Husni and Abd. Ghani, Awang Noor and Musa, Mohamed Hanafi (2002) The removal and burning of pineapple residue in pineapple cultivation on tropical peat: An economic viability comparison. Pertanika Journal of Tropical Agricultural Science, 25 (1). pp. 47-51. ISSN 1511-3701

Ahmed, Osumanu Haruna and Mohd Hanif, Ahmad Husni and Abd Rahim, Anuar and Musa, Mohamed Hanafi (2001) Pineapple residue management practices and fertilizer regimes: Effects on P and K uptake, yield and some economic implications. Pertanika Journal of Tropical Agricultural Science, 24 (2). pp. 123-129. ISSN 1511-3701

Ahmed, Osumanu Haruna and Mohd Hanif, Ahmad Husni and Abd Rahim, Anuar and Musa, Mohamed Hanafi (2001) Some observations in pineapple production under different fertilizer programmes and different pineapple residue management practices. Pertanika Journal of Tropical Agricultural Science, 24 (2). pp. 115-121. ISSN 1511-3701

Ahmed, Osumanu Haruna and Mohd Hanif, Ahmad Husni and Musa, Mohamed Hanafi and Syed Rastan, Syed Omar (2000) Macronutrients distribution and cycling of pineapple planted on tropical peat. Pertanika Journal of Tropical Agricultural Science, 23 (2). pp. 89-95. ISSN 1511-3701

Ahmed, Osumanu Haruna and Mohd Hanif, Ahmad Husni and Syed Rastan, Syed Omar and Musa, Mohamed Hanafi and Koh, S. K. (1999) The effects of residue management practices on phosphorus and potassium uptake in pineapple. Malaysian Journal of Soil Science, 3. pp. 29-37. ISSN 1394-7990

Ahmed, Osumanu Haruna and Abd Rahim, Anuar and Mohd Hanif, Ahmad Husni (2006) Some essentials of good scientific research. Universiti Putra Malaysia Press, Serdang, Selangor. ISBN 9789833455492

Ch’ng, Huck Ywih and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad and Jol, Hamdan (2013) Assessment of soil fertility in a tropical rehabilitated forest. In: Advances in Tropical Soil Science. Universiti Putra Malaysia Press, Serdang, Selangor, pp. 18-38. ISBN 9789673443482

Ahmed, Osumanu Haruna (2013) Effect of mixing sago (Metroxylon sagu), waste water and peat soil water on minimizing ammonia volatilization and improvement in nutrient use efficiency of maize (Zea mays L.). In: Advances in Tropical Soil Science. Universiti Putra Malaysia Press, Serdang, Selangor, pp. 83-97. ISBN 9789673443482

Jol, Hamdan and Ahmed, Osumanu Haruna and Md Isa, Isharudin (2013) Mineralogy and potassium supply of some weathered tropical soils developed from different parent materials. In: Advances in Tropical Soil Science. Universiti Putra Malaysia Press, Serdang, Selangor, pp. 1-17. ISBN 9789673443482

Omar, Latifah and Ahmed, Osumanu Haruna and Nik Ab. Majid, Nik Muhamad (2018) Improving nutrient use efficiency of maize cultivated on a tropical acid soil using clinoptilolite zeolite. In: Joint Symposium of the 8th International Agriculture Congress 2018 and 6th International Symposium for Food & Agriculture 2018 (8th IAC – 6th ISFA 2018), 13-15 Nov. 2018, Auditorium Rashdan Baba, TNCPI Building, Universiti Putra Malaysia. (pp. 227-230).

Ahmed, Osumanu Haruna and Chn'g, H. Y. and Perumal, Palanivell and Omar, Latifah and M., Ali and Jalloh, Mohamadu Boyie and A., Azwan (2018) Organic approach of detoxyfying mineral acid soils improves crop productivity. In: Joint Symposium of the 8th International Agriculture Congress 2018 and 6th International Symposium for Food & Agriculture 2018 (8th IAC – 6th ISFA 2018), 13-15 Nov. 2018, Auditorium Rashdan Baba, TNCPI Building, Universiti Putra Malaysia. (p. 226).

Saidin, Ainul Asyira and Kasim, Susilawati and Ahmed, Osumanu Haruna and Mohd Shuib, Effyanti (2014) Effect of ratios on pH and selected nutrient contents in compost tea produced from agricultural waste. In: International Conference on Plant Physiology 2014, 26-28 Aug. 2014, Discovery Kartika Plaza Hotel, Bali, Indonesia. (pp. 258-261).

Perumal, Palanivell and Ahmed, Osumanu Haruna and Kasim, Susilawati and Nik Ab. Majid, Nik Muhamad (2014) Improving rice (Oryza sativa L. cv. MR219) growth, nutrient uptake and recovery using Clinoptilolite zeolite. In: International Conference on Plant Physiology 2014, 26-28 Aug. 2014, Discovery Kartika Plaza Hotel, Bali, Indonesia. (pp. 269-273).

Hoque, Mohammed Muzammel and Mustafa Kamal, Abu Hena and Idris, Mohd Hanafi and Ahmed, Osumanu Haruna and Billah, Md. Masum (2014) Litter production in relation to some climatic variables in a mangrove ecosystem of Sarawak, Malaysia. In: Malaysia International Biological Symposium 2014, 28-29 Oct. 2014, Putrajaya, Malaysia. (pp. 152-155).

Kasim, Susilawati and Rosidi, Nur Adila and Mohd Shuib, Effyanti and Ahmed, Osumanu Haruna and Ahmad, Khairulmazmi and Ismail, Mohd Razi and Abd. Rahman, Nordin (2013) Selected chemical and physical properties of soils planted with vegetables at Kundasang Sabah. In: Persidangan Kebangsaan Pertama Program Pemindahan Ilmu (KTP 01), 21-23 Ogos 2013, Equatorial Hotel, Bangi. (pp. 815-821).

Gandaseca, Seca and Ahmed, Osumanu Haruna and Majid, N. M. (2012) Soil compaction of rehabilitated and secondary forests at Bintulu, Sarawak. In: International Symposium on Reclamation, Rehabilitation and Restoration Towards a Greener Asia, 3-5 July 2012, Kuala Lumpur, Malaysia. .

Mohd Hanif, Ahmad Husni and Ahmed, Osumanu Haruna (2004) Value addition to pineapple leaves residue: I. extraction of humic acid. Research Snapshot. The Research Management Centre, Serdang, Selangor.

Mohd Hanif, Ahmad Husni and Ahmed, Osumanu Haruna (1999) Production modelling of pineapple grown on tropical peat: nutrient budget and cycling. Research Report. The Research Unit, Universiti Putra Malaysia, Serdang, Selangor.

Mohd Hanif, Ahmad Husni and Ahmed, Osumanu Haruna Value addition to pineapple residues from zero burning. Research Report. Research Management Centre, Serdang, Selangor.

Wong Sing King (2013) Methods and materials for eliminating nematode pests in black pepper. PI2013700466.

Osumanu Haruna Ahmed (2011) An improved plant treatment agent. PI2011003712.

Osumanu Haruna Ahmed (2011) An improved plant treatment. PI2011002910.

Osumanu Haruna Ahmed (2010) Compost ingredient and its use in crop cultivation. PI2010004792.

Ahmed Osumanu Haruna (2009) A fertiliser composition. UNSPECIFIED.

Osumanu Haruna Ahmed (2009) Method of isolating humic acid. UNSPECIFIED.

Ahmed, Osumanu Haruna (2002) Towards Sustainable Management of Pineapple Residues. Doctoral thesis, Universiti Putra Malaysia.

Ahmed, Osumanu Haruna (1999) Nutrients Uptake and Cycling of Pineapple Planted on Tropical Peat. Masters thesis, Universiti Putra Malaysia.