Yusop, Mohd Khanif (1988) Recovery of Field-Applied Fertilizer Nitrogen by Rice. Pertanika, 11 (1). pp. 25-30.
Field estimation of the recovery of fertilizer N applied to rice COryza sativa L.) was carried out as an appraisal of the prevailing fertilizer management practice. The study was carried out on a farmers field for two growing seasons. Soil samples at three depths, 0-15 cm, 15-30 cm and 30-45 cm and water samples were collected every two weeks during the growing season. The plant recovery of fertilizer N was estimated by the difference between the N treated plots and the controls. Although this method could overestimate the fertilizer N recovery due to priming effect, under the conditions in the study the effect was assumed to be minimal. An increase in ammonium N content in the soil was not observed even immediately after N application. The removal of fertilizer N from the soil through either plant uptake or loss processes was very rapid. Higher ammonium N was only detected in the water samples early in the growing season but not at the mid-season after the second N application. The recovery of fertilizer N in the plant were 36% and 30% during the main and off-seasons respectively. Most of the N was in the grain. About 69 kg of the 95 kg of the total N removed by the crops per hectare was derived from the soil. More than 64% of the fertilizer N applied was either lost or immobilized in the soil.
|Keyword:||Nitrogen efficiency;, fertilizer nitrogen, rice ammonium nitrogen, nitrogen balance|
|Faculty or Institute:||Faculty of Agriculture|
|Deposited By:||Nur Izyan Mohd Zaki|
|Deposited On:||17 Nov 2009 01:07|
|Last Modified:||27 May 2013 07:02|
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