Effect of irrigation and nitrogen management on yield and economics of SRI-grown hybrid rice (Oryza sativa)

MADANE ANANDA JAGANNATH, J K SINGH, VIJAY PRATAP

Abstract


A field experiment was conducted during rainy season (2014–15) at Banaras Hindu University, Varanasi tostandardize water saving and economical nitrogen management options for hybrid rice (Oryza sativa L.) under SRI.The experiment was laid-out in a three-times replicated split-plot design involving three irrigation scheduling, viz.irrigation at 2 days after disappearance of ponded water (DADPW), 5 DADPW and 8 DADPW assigned to main-plotsand five nitrogen management options, viz. 100% recommended dose of nitrogen (RDN, 150 kg N/ha), 100% RDN+ Sesbania aculeata, 75% RDN + Sesbania aculeata, 100% RDN + BGA (12 kg/ha) and 75% RDN + BGA (12 kg/ha) were allotted in sub-plots. Results reveal that scheduling of irrigation at 2 DADPW was recorded significantlyhigher dry matter accumulation (DMA), leaf area index (LAI), yield attributes and finally enhanced grain yield andnet returns by 16.2, 20.3% and 11.7 and 12.6% during 2014 and 2015, respectively over 8 DADPW but statisticallyat par with scheduling of irrigation at 5 DADPW. Among nitrogen management options, application of 100% RDN(150 kg N/ha) + BGA (12 kg/ha) recorded higher DMA, LAI, yield attributes and finally enhanced grain yield andnet returns by 14.4, 22.8% and 12.6 and 18.5%, respectively over application of 100% RDN alone. Hence, irrigationat 2 DADPW and combined application of 100% RDN + BGA (12 kg/ha) can be recommended for obtaining higheryield and profit from hybrid rice under SRI.

Keywords


BGA, Irrigation scheduling, Recommended dose of nitrogen, System of rice intensification, Sesbania

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