Effect of rates of nitrogen and relative efficiency of sulphur-coated urea and nitrapyrin-treated urea in dry matter production and nitrogen uptake by rice |
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| Authors: | S N Sharma Rajendra Prasad |
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| Institution: | (1) Division of Agronomy, Indian Agricultural Research Institute, 110012 New Delhi |
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| Abstract: | Summary A field experiment conducted for two rainy seasons (1974 and 1975) on a sandy clay loam soil at the Indian Agricultural Research Institute, New Delhi showed that at 100kg N/ha the apparent recovery of urea nitrogen by the rice crop was only 28%, which was raised to 41.7% by treating urea with Nitrapyrin and to 47.4% by coating urea withneem (Azadirachta indica Juss) cake. The recovery with sulphur-coated urea was 37.7%. Dry matter production nitrogen concentration in plant and uptake by rice were increased as the rate of nitrogen was increased from 0 to 150kg N/ha. Advantage of treating urea with Nitrapyrin or coating withneem cake was seen more in grain than straw yield. |
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| Keywords: | Apparent N recovery Denitrification IBDU N concentration Neem cake Nitrification inhibitors Nitrapyrin (N-Serve) N loss N uptake Rice Sandy clay loam Slow-release N fertilizers Sulphur-coated urea Urea |
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