Abstract
Wheat and sorghum are important cereal crops next only to rice in India and several other Asian countries. Improved water management requires accurate scheduling of irrigation, which in turn requires an accurate measurement of daily crop evapotranspiration ETc. Thus, the first objective of this study was to measure daily, weekly, and seasonal crop ETc of wheat and sorghum directly from sensitive weighing-type lysimeters. Experiments were conducted in a set of two electronic weighing-type lysimeters, 2 × 2 m in surface area and 2-m deep, to measure the hourly evapotranspiration of wheat and sorghum from 1991 to 1995 at Karnal, India. The average daily ETc of wheat varied from 4 mm/d at milking stage. The peak ETc of wheat was 4.6 mm/d and it occurred 16 weeks after sowing at the reproductive growth stage when leaf area index was 3.5. The measured seasonal ETc of wheat was 336 mm. In the case of sorghum, ETc was 3 mm/d at the initial stage, achieved a peak value of 6 ...
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