Rice Productivity and Water Use Efficiency under Different Irrigation Management System in North-Western India
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Keywords:Alternate wetting and drying, Basmati rice yield, PAU Tensiometer, Water use efficiency
Rice (Oryza sativa L.) is an important kharif cereal crop with huge irrigation water demand.Â Over the years, several water saving technologies have been developed, tested and disseminated among farming community for enhancing irrigation water productivity in rice.Â The present study, compared continuous flooding (T1), alternate wetting and drying in which irrigation is done 2 days after seepage (AWD; T2), soil matric potential(Ïˆm;Â tensiometer guided) based irrigation scheduling at Ïˆm=15kPa (T3) and Ïˆm=20kPa (T4) using PAU tensiometer on basmati rice (var. Pusa Basamti-1121) productivity and waterÂ use efficiency (WUE). The results revealed significantly (p<0.05) higher rice grain yieldÂ (38.85 t ha-1) under T2, compared with the other irrigation scheduling methods. The AWD
(T2) method of irrigation scheduling resulted in saving of 27 per cent irrigation water, compared with T1. The water productivity in basmati rice production was 0.285 kg m-3,Â 0.446 kg m-3, 0.414 kg m-3 and 0.528 kg m-3, respectively in four compared irrigation scheduling methods. As in Punjab around 3.0 Mha area is under rice cultivation and if weÂ adopt irrigation after 2-3 days of seepage it will save around 27 per cent water as compared
to continuous flooding amounting about 9.6 billon m3 of water.
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The manuscripts once accepted and published in the Indian Journal of Extension Education will automatically become the property of the Indian Society of Extension Education, New Delhi. The Chief Editor on behalf of the Indian Journal of Extension Education holds the copyright.