ISSN:
1573-5036
Keywords:
Arachis hypogaea
;
Cajanus cajan
;
Groundnut
;
N turnover
;
15N fertilizer-N
;
Pigeon pea
;
Sorghum
;
Sorghum bicolor
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary A field experiment on N turnover in rotations of groundnut, sorghum and pigeonpea crops was conducted in an Indian Alfisol during 1978–80.15N-labelled urea N was applied @ 40 kg ha−1 in 1978. In the first year, the groundnut utilized 19.5% of the applied labelled N, sorghum 25.5%, and pigeon pea 10.3%. More fertilizer N was removed through weeding than by crop uptake in sorghum and pigeon pea. The fertilizer N left behind in soil upto 40 cm depth was 44.4% in groundnut plots, 35.1% in sorghum plots and 40.1% in pigeon pea plots. The uptake in 1979 of the residual fertilizer N in the soil was 8.9% in sorghum, 8.3% in groundnut and 2.8% in pigeon pea. In 1980, it declined to less than 2% for pigeon pea and groundnut and to about 4% for sorghum. A balance sheet drawn at the end of each rotation showed that about 51.3% of the applied labelled N was accounted for in groundnut-sorghum-pigeon pea rotation, 70.9% in sorghumpigeon pea-groundnut, and 43.5% in pigeon pea-groundnut-sorghum.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02182338
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