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dc:title "HTML Summary of #7529 \n\nNitrogen returns to soil by selected cropping systems on a Vertisol in the semi-arid tropics of India\n\n";
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bibo:abstract "Limited nitrogen (N) availability is a common constraint for crop production on Vertisols. Erratic rainfall in the semi-arid tropics and relatively high cost of N fertilizers make its application a risky investment, therefore, most farmers do not apply N fertilizer in dryland crops. Cropping systems which improve soil fertility can minimize the need for synthetic fertilizers. In a two-year experiment, four cropping systems and mirror images of two systems were examined for their returns of N to soil in roots and fallen leaves. Sorghum/pigeonpea intercrop for two years (S/PP S/PP) and cowpea/pigeonpea intercrop rotated with sorghum followed by safflower (COW/PP S+SAF) contributed around 54 kg N ha-1 in roots and fallen leaves when no nitrogen fetilizer was applied. The largest proportion of this N was returned to soil through fallen leaves of pigeonpea. In terms of root mass a rotation of sorghum followed by safflower in the post-rainy season (S+SAF S+SAF) deposited almost the same amount of N in roots if adequately fertilized. Under S/PP S/PP the soil mineral N content was measurable higher compared to other systems."^^xsd:string;
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bibo:issue "3";
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bibo:volume "17";
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dct:date "1999";
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skos:prefLabel "Agriculture-Farming, Production, Technology, Economics"@en .
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skos:prefLabel "Soil Science"@en .
foaf:name "The Gaurav Society of Agricultural Research Information Centre (GSARIC)"^^xsd:string;
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bibo:issn "09704884";
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