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Labeled nitrogen fertilizer research with urea in the semi-arid tropics 3. Field studies on alfisol

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Relation http://oar.icrisat.org/6029/
http://dx.doi.org/10.1007/BF02220246
 
Title Labeled nitrogen fertilizer research with urea in the semi-arid tropics 3. Field studies on alfisol
 
Creator Moraghan, J T
Rego, T J
Buresh, R J
 
Subject Soil Science
Fertilizer Appications
 
Description Field studies with bordered microplots were conducted on an Alfisol in the semiarid tropics of India to determine the fate of 15N-labeled urea applied to dryland sorghum in two successive rainy seasons, and the effect of method of application on N fertilizer efficiency. Recoveries of 15N-labelled fertilizers by above-ground plant parts ranged from 46.7% to 63.6% in 1981 when the rainfall was above average, and from 54.4% to 66.9% in 1980 when the rainfall was near average. Small (0.014 g) pellets of urea applied twice as post-emergent applications in separate 5 cm deep bands were more effective than single pre-emergent applications either surface applied or incorporated. Maximum yields were obtained with 120 kg N/ha when applied by incorporation, or with 80 kg N/ha when applied as a banded split application. Large (1.0 g) pellets of urea (supergranules) placed at a depth of 5 cm were also superior to the incorporated, small-pellet treatment in 1981. The 15N-balance data for the soil (0-90 cm in depth)-plant system in 1981 showed that the fertilizer N unaccounted for ranged from 5.1% to 20.6%. High grain yields, in excess of 6 000 kg/ha, with N fertilizer losses of less than 10% could be obtained through fertilizer management during a very wet season. The data from the Alfisol experiments were compared with data from similar Vertisol experiments. N fertilizer losses resulting from incorporated and surface applications were greater from Vertisols than from Alfisols in the wetter year
 
Publisher Kluwer
 
Date 1984
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/6029/1/193-203.pdf
Moraghan, J T and Rego, T J and Buresh, R J (1984) Labeled nitrogen fertilizer research with urea in the semi-arid tropics 3. Field studies on alfisol. Plant and Soil, 82 (2). pp. 193-203. ISSN 1573-5036