Regional Research Station, Orissa University of Agriculture and Technology, Chiplima, Sambalpur, 768025
A field experiment was conducted during 1994–97 on clay-loam soil of medium land with winter groundnut (Arachis hypogaea L.). The pod yield increased with increasing irrigation water: cumulative pan evaporation (IW: CPE) and the maximum yield of 22.4 q/ha was obtained at 1.4 IW: CPE with 52.5 cm evapotranspiration (ET), 76.1 cm water requirement (WR) and 42.8 kg/ha/cm crop water-use efficiency (CMUE). It required 12 irrigations of 6 cm depth each with ET. Pan E ratio of 0.87. Most of the ancillary characters, however, showed increasing trend up to 1.2 IW:CPE which also gave pod yield (21.91 q/ha) at par with that of 1.4 IW:CPE. The value of ET, WR, run-off and percolation at 1.2 IW:CPE were 46.95, 65.39, 3.25 and 21.39 cm respectively. The crop water-use efficiency and field water-use efficiency were computed to be 46.69 and 33.81 kg/ha/cm respectively with ET:Pan E value of 0.78 at this moisture regime.
IW: CPE, Yield, Water balance, Evapotranspiration, ET: Pan E, Groundnut
