Estimation of water requirement of rice at different growth stages by using microlysimeter [in Bangladesh]
1991
Bhuiyan, L.R. | Islam, M.J.
Microlysimeters were fabricated to estimate water requirement of rice at different growth stages. Daily evapotranspiration, evaporation, seepage and percolation rates were directly measured and transpiration rates were derived. During the seedling establishment stage evapotranspiration rates ranged from 2.8 to 3.3 mm/day and transpiration rates ranged from 0.2 to 0.5 mm/day. Mean daily transpiration rates at tillering stage during irrigated season were higher than mean daily evaporation rates. Transpiration was the major component of evapotranspiration loss during the booting stage. Evapotranspiration rates reached the peak point at the flowering stage were 8.1, 6.2 and 4.9 mm/day in Boro 1981, 1982 and T. Aman (rainfed lowland rice) 1982 and mean daily transpiration rates of the corresponding periods were 6.5, 4.1 and 3.1 mm/day. The results indicated high demand of water at the flowering stage. Evapotranspiration gradually decreased with maturity of rice. Mean daily evapotranspiration rates at maturation stage were 3.3, 4.4 and 3.9 mm/day in Boro 1981, 1982 and T. Aman 1982 respectively. Mean daily seepage and percolation ranged from 1.1 to 1.7 mm/day. Estimated water requirement for field duration of 112 days for BR3 variety in irrigated Boro in 1981 and 1982 was 700.3 and 618.9 mm. Total water required from seed to seed was 940.3, 858.2 and 727.9 mm for irrigated Boro in 1981, 1982 and T. Aman 1982, respectively
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