Irrigation scheduling for winter sorghum in South Gujarat, based on IW /CPE ratios

B.S. Patel, K.R. Patel, R.G. Patel, R.S. Joshi, S. Raman

Abstract


An experiment to determine schedule irrigation in sorghum was conducted at the Main Irrigation Research Centre, Navsari, India, during the winter seasons of 1977-78 and 1978-79. Two depths of irrigation water, 60 mm (I1) and 80 mm (I2), each measured by water meter, were evaluated at four IW/CPE ratios, R1 = 0.60, R2 = 0.75, R3 = 0.90 and R4= 1.05 during both years. Five irrigations each of 80 mm depth at an 1IW/CPE ratio of 0.90 proved to be optimal for the winter sorghum. It gave maximum grain (4.26 t ha-1) and stover (9.34 t ha-1) yields with a water-use efficiency of 11.67 kg ha-1 mm-1 of water applied. A net profit of Rs. 3738 ha-1 (US $ = 280 ha-1) was obtained in this treatment. The observed consumptive use of water by winter sorghum was 397 mm which was significantly (P= 0.01) correlated (r= +0.95) with the USWB Pan Evaporation Value for the same crop growth period.

Keywords


Sorghum yield; Evapotranspiration; Irrigation; Water-use efficiency

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