Recovery of Field-Applied Fertilizer Nitrogen by Rice

Yusop, Mohd Khanif (1988) Recovery of Field-Applied Fertilizer Nitrogen by Rice. Pertanika, 11 (1). pp. 25-30.

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Abstract

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.

Item Type:Article
Keyword:Nitrogen efficiency;, fertilizer nitrogen, rice ammonium nitrogen, nitrogen balance
Faculty or Institute:Faculty of Agriculture
ID Code:2679
Deposited By: Nur Izyan Mohd Zaki
Deposited On:17 Nov 2009 01:07
Last Modified:27 May 2013 07:02

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