A field experiment in rice conducted during kharif 1970-71 revealed that sub- mergence of land throughout the growing period with a depth of 5 cm water was necessary for higher grain yields. Water requirements from planting to harvest were 1417 mm and 1217 mm for the rice varieties IR 8 and IR 20 for the above treatment. Ammonium sulphate influenced grain yields better than the organic manures on equal nitrogen basis 1. e. 187.5 kg N/hs and it gave higher production per Kg of N and higher out turn per rupee of expenditure among the manures tried.
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