February 26, 2005

2005: Highlight # 24

Jothimani and Thiagrajan discuss how 'System of Rice Intensification' (SRI) improves nitrogen use efficiency while improving productivity and reducing environmental hazards... 

Water and Nitrogen Use Efficiency of Rice under System of Rice Intensification

S. Jothimani and T.M. Thiagrajan

Nitrogen (N) is a key nutrient determining the yield of rice. Paddy crop utilizes hardly 30-40 percent of applied nitrogen to the soil while the remaining portion is lost in various ways.

SRI which is efficient in absorption and utilization of both water and nutrients greatly enhances the efficiency of applied fertilizers, reduces the cost of inputs and prevents the losses of nutrients to eco-systems. Application of controlled release nitrogen (CRN) either delays nutrient availability or extends it significantly with synchronous nitrogen supply for crop demand. It reduces environmental hazards, improves rice yields and nitrogen use efficiencies.

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