Recorded rainfall of 30 years from 1953 to 1982 was analysed and ET was worked out for dryland crops, and the results indicated that there is assured rainfall in every year with 75 per cent probable rainfall of 617 mm. It is evident to observe that 56 per cent of total rainfall was received during North East monsoon period. Assured rainfall was also observed during April, May, August, September, October and November with a CV value of 71, 80, 89, 64, 57 and 72% respectively. The weekly analysis indica- ted assured rainfall during 16, 17, 18, 32, 35, 37. to 47 and 49 standard meteorologi- cal weeks. The worked out ET was 778.16 mm for Cotton, 422.38 mm for sorghum, 370.38 mm for Bajra and 255.65 mm for sunflower. It was observed that ET was found reduced as sowing was delayed.
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Tamil Nadu Agricultural University
Coimbatore - 641 003
Tamil Nadu, India.
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