Adaptation and mitigation through water management

Method of planting and water management on water saving and GHGs:

A field experiment was conducted at IARI with three planting methods of rice namely direct seeded rice (DSR–P1), system of rice intensification (SRI) with drip irrigation (P2) and traditional method as control (P3). Four varieties of rice namely Pusa 44, Pusa 834, Pusa 1121 and Pusa 1401 were sown with three replications. Results showed significantly higher grain yield in traditional planting method (5.2 t ha-1) as compared to DSR (drip) and SRI (drip). Amongst rice varieties, Pusa 44 produced significantly higher yield (6.4 t ha-1) in SRI with drip and in traditional method while Pusa 1401 gave yield of 3.85 t ha-1 in DSR under drip. The study revealed that irrigation water use efficiency (0.67 kg grain/m3) and field water use efficiency (0.45 kg grain/m3) were found to be highest in SRI method with drip.

Water saving and efficiencies under different method of planting

Methane emission was significantly reduced in DSR under drip irrigation as well as conventional irrigation practices. Nitrous oxide emission was increased under both the water management practices in DSR and SRI as compared to the conventional transplanted rice. The global warming potential was reduced by 52% under DSR-drip irrigation and 57% under SRI-conventional irrigation in comparison to the conventional flooded control.

Impact of different water saving technologies on greenhouse gas emissions in rice

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