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Effect of enhancing urea-humic acid mixture with refined acid sulphate soil


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


Problem statement: Acid Sulphate Soil (ASS) is a problem soil partly because of its high acidity. This low pH could be exploited to reduce ammonia loss from urea by reducing soil microsite pH. The use Humic Acid (HA) to control ammonia loss from urea has been reported but the cost of this material is high. This laboratory study compared the effect of enhancing urea-humic acid mixtures with acid sulphate soil on NH3 loss, pH, exchangeable ammonium and available nitrate contents. Approach: Humic acid, acid sulfate soil and soil used in the incubation study were analyzed for selected soil physical-chemical properties using standard procedures. Urea-HA-ASS mixtures were prepared and ammonia volatilization of the mixtures was evaluated by the closed-dynamic air flow system. The treatments were evaluated in a randomized complete block design with 3 replications. Standard procedures were used to determine ammonia loss, soil pH, exchangeable ammonium and available nitrate at 22 days of incubation. Data obtained were analyzed using analysis of variance and Duncan's test using Statistical Analysis System (SAS) version 9.2. Results: Urea amended with 0.75 g ASS significantly reduced ammonia volatilization. Although the use of appropriate amount of acid sulphate soil to control ammonia loss is possible, excessive use of this material is not recommended because of Fe in it. Conclusion: Urea amended with 0.75 g ASS reduced ammonia.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Agriculture and Food Sciences
Faculty of Forestry
DOI Number: https://doi.org/10.3844/ajassp.2009.1892.1896
Publisher: Science Publications
Keywords: Acid sulphate soils; Urea; Humic acids; Ammonia loss
Depositing User: Norhazura Hamzah
Date Deposited: 10 Dec 2013 07:30
Last Modified: 29 Nov 2017 03:45
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3844/ajassp.2009.1892.1896
URI: http://psasir.upm.edu.my/id/eprint/14235
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