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Labeled nitrogen fertilizer research with urea in the semi-arid tropics. II. Field studies on a Vertisol

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Relation http://oar.icrisat.org/6028/
http://dx.doi.org/10.1007/BF02232936
 
Title Labeled nitrogen fertilizer research with urea in the semi-arid tropics. II. Field studies on a Vertisol
 
Creator Moraghan, J T
Rego, T J
Buresh, R J
Vlek,, P L G
Burford, J R
Singh, S
Sahrawat, K L
 
Subject Fertilizer Appications
 
Description Field studies were conducted on an Indian Vertisol to determine the fate of 15N-labeled fertilizers applied to dryland sorghum in two successive rainy seasons. In the 1981 season, a post-emergence split-band (SB) urea application of 74 kg N/ha was superior to pre-emergence applications of surface-applied (S) or incorporated (I) urea at the same rate; 907 mm of rainfall fell during the growing period. Percentages of applied N recovered in the soil-plant system after harvest were 94%, 74% and 72%, respectively, for the SB, I and S application methods; 39%, 45% and 42% of the added N in the SB, I and S treatments, respectively, remained in the soil after the final harvest. Plant utilization of added urea-N was greater in 1980 when rainfall during the growing season was 212 mm less than in 1981. S or I applications of urea at 74 kg N/ha were equally efficient during 1980 with above-ground plant 15N recoveries of 48.0% and 48.6%, respectively. Residual soil N derived from fertilizer was of little value for a sorghum crop in the following rainy season and for a safflower crop in the post-rainy season in a double-cropping system
 
Publisher Kluwer
 
Date 1984
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/6028/2/21-33.pdf
Moraghan, J T and Rego, T J and Buresh, R J and Vlek,, P L G and Burford, J R and Singh, S and Sahrawat, K L (1984) Labeled nitrogen fertilizer research with urea in the semi-arid tropics. II. Field studies on a Vertisol. Plant and Soil, 80 (1). pp. 21-33. ISSN 0032-079X