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

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

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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

Item Type: Article
Uncontrolled Keywords: Carthamus tinctorius L - Double-cropping - Fertilizer application - Nitrogen balance - Nitrogen fertilizer - Safflower - Semi-arid tropics - Sorghum bicolor L - Urea
Subjects: Others > Fertilizer Applications
Depositing User: Mr B K Murthy
Date Deposited: 06 Jul 2012 02:28
Last Modified: 06 Jul 2012 02:29
Official URL:
Acknowledgement: UNSPECIFIED
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