Abstract
An experiment was conducted at Bilaspur during summer seasons of 1994 and 1995 to study the effect of irrigation levels on kernel yield, nutrient uptake and oil yield of groundnut (Arachis hypogaea L.). Irrigating summer groundnut at an 0.8 IW : CPE ratio (irrigation at 75 mm CPE) gave significantly higher podslplant, kernel yield and oil yield and resulted in higher uptake of N, P and K by the plants over 0.6 IW :CPE ratio (irrigation at 100 mm CPE). Irrigations scheduled under 1.0 and 1.2 IW :CPE ratio had no further advantage over an 0.8 IW :CPE ratio. Stress-day index concept proved useful to schedule irrigation in summer groundnut. Water-use effi- ciency (WUE), net and additional returns and input:output ratio were highest with an 0.8 IW :CPE ratio irrigation schedule.
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