<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Nitrogen returns to soil by selected cropping systems on a Vertisol in the semi-arid tropics of India"^^ . "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."^^ . "1999" . . "17" . "3" . . "The Gaurav Society of Agricultural Research Information Centre (GSARIC)"^^ . . . "Crop Research (Hisar)"^^ . . . "09704884" . . . . . . . . . . . . . . . . "B"^^ . "Seeling"^^ . "B Seeling"^^ . . "B B"^^ . "Reddy"^^ . "B B Reddy"^^ . . "T J"^^ . "Rego"^^ . "T J Rego"^^ . . "M D"^^ . "Abdurahman"^^ . "M D Abdurahman"^^ . . . . . . "Nitrogen returns to soil by selected cropping systems on a Vertisol in the semi-arid tropics of India (PDF)"^^ . . . . . "Nitrogen returns to soil by selected cropping systems on a Vertisol in the semi-arid tropics of India (Other)"^^ . . . . . . "Nitrogen returns to soil by selected cropping systems on a Vertisol in the semi-arid tropics of India (Other)"^^ . . . . . . "Nitrogen returns to soil by selected cropping systems on a Vertisol in the semi-arid tropics of India (Other)"^^ . . . . . . "Nitrogen returns to soil by selected cropping systems on a Vertisol in the semi-arid tropics of India (Other)"^^ . . . . . . "Nitrogen returns to soil by selected cropping systems on a Vertisol in the semi-arid tropics of India (Other)"^^ . . . . . "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" . "text/html" . . . "Soil Science"@en . . . "Agriculture-Farming, Production, Technology, Economics"@en . .