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- W2147343357 abstract "Lysimeter experiments were conducted on rice during rainy season (July–October) and sunflower during summer seasons (March–June) in a set of two electronic weighing type lysimeters of 2 m × 2 m × 2 m size to measure the hourly evapotranspiration of these crops from 1994 to 1995 at Karnal, India. The average weekly ET of rice varied from <3 mm per day in the early growing period to >6.6 mm per day at milking stage. The peak ETc was 6.61 mm per day and it occurred 11 weeks after transplanting at reproductive stage when LAI was 3.4. In case of sunflower, ETc was <1.0 mm per day at the initial stage, achieved a peak value of 14.1 mm per day between 8 and 9 weeks after sowing (WAS) and it declined to 3 mm per day during maturity phase. Precise information on crop coefficients, which is required for regional scale irrigation planning is lacking in Asian countries. Crop coefficients (Kc) for rice and sunflower from ETc measurements and weather data have been developed. The estimated values of crop coefficient for rice at the four crop growth stages (initial, crop development, reproductive and maturity) were 1.15, 1.23, 1.14 and 1.02 and corresponding Kc values for sunflower were 0.52, 1.1, 1.32 and 0.41. The estimated Kc values of sunflower is 11.6–74.2% higher than the values suggested by FAO. Relationship between standard FAO–Penman–Monteith with other reference evapotranspiration methods has also been established." @default.
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- W2147343357 date "2000-06-01" @default.
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- W2147343357 title "Determination of evapotranspiration and crop coefficients of rice and sunflower with lysimeter" @default.
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- W2147343357 doi "https://doi.org/10.1016/s0378-3774(99)00071-2" @default.
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