Moisture depletion patterns in coconut plantation under rainfed
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2007-02
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Under rainfed conditions, the evapotranspiration was about 4mm/day during the first two days of receipt of rains. The values changed to 2.4mm/day and 2.1 mm/day, respectively, when calculated for the first week and first two weeks after rains. 0-70 cm layer had the maximum contributron to the water needs of coconut. Water loss from the interspaces was higher than from basins. Under irrigated conditions, the maximum evapotranspiration (6.6mm/day) and water loss from interspaces (5.6 mm/day) were recorded with 20 mm water at IW/CPE ratio of 1.00. Decreasing frequency gradually decreased the rates to 4.0mm and 2.3 mm/day at IW/CPE = 0.75 and 0.50, respectively from 0-90 cm soil depth. It is concluded that irrigation with 20 mm of water at IW/CPE ratio=1.00 is adequate to meet the water needs of coconut for optimum growth. A higher quantity is not desirable as it leads to deep percolation losses.
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In: Proceedings, National Seminar on Agrometeorology of Plantation Crops, RARS, Pilicode, KAU. 12-13 Mar. 1987 p-22-26