Author(s): A. ZAMAN, S.K. RANA AND S. MALLICK

Abstract: All India Coordinated Project for Research on Water Management(ICAR), Kalyani Centre of Bidhan Chandra Krishi Viswavidyalaya, West Bengal conducted a series of field trials on sandy clay loam (£ntiso~ at the Experimental Station, Memari in the district of Burdwan under during the years 1985 to 1995 with transplanted rice botty in rainy and summer season under DVC command to provide suitable irrigation scheduling for obtaining optimum yield with maximum economy of irrigation water. The surface soil of the experimental site contains 0.62% organic carbon, 48. 7 kg N/ha having pH of 6. 7. Average ground water table was near to the surface in the month of August, which recedes gradually and reached to a depth of 2.5 meter around May and major portion of average annual rainfall (1300 mm) falls between July to September. The results of the on-station field trials gave comprehensive recommendations as an integral part of technology generation on water management practices rice cultivation. The results revealed that levels of irrigation during rainy season did not influence the grain yield of rice under normal uniformly distributed rainfall. However, the highest value of WUE was obtained with the irrigation 5 cm three days after disappearance of ponded water. The rice (cv IR36) responded to nitrogen, phosphorous and potassium up to 80, 60 and 120 kg/ha, respectively with an average yield of 4.8 t/ha at water expenses 86 cm, on an average. The same cultivar of transplanted summer rice gave an averageyield of 6.1 t/ha with the continuous submergence of 5±2 cm water up to grain fillingstage gave the highest grain yield of rice with 100 kg \'N/ha. However, water use efficiency increased with lesser number of irrigation and was found maximum when irrigation was given 5 days after disappearance of ponded water. Continuous submergence of ponded water up to grain filling stage showed less weed intensity irrespective of growing seasons.

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