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Paper Description


Water Requirements of Sugar Beet Beta vulgaris under Heavy Cracking Clay Soils


Authors: Abdel Hadi Abdel Wahab and Ahmed Ali Salih
Abstract: Crop coefficients (Kc) of sugar beet were determined for accurate calculation of water requirements (CWR) and better irrigation water management. Three irrigation treatments were used during two seasons to measure actual crop water use (ETc) under no soil stress treatment using gravimetric sampling. In the second season (SS), the method was modified to target 8 temporal points during crop growth for smooth calculation of ETc under sufficient moisture supply to avoid the distortion that was created by the continuous gravimetric sampling after, before and during each irrigation cycle on the experimental plots. Water was stopped when each targeted sampling point was reached using large plots where intensive sampling continues until the crop reaches severe water stress or permanent wilting point (PWP). The actual crop water use was extracted from the soil moisture depletion curve which allowed the identification of two clear segments. The first segment indicated crop water use during no water stress while the change of the slope indicated the beginning of the water stress. The reference crop evapotranspiration (ET0) was determined on daily basis using appropriate weather data that coincides with the ETc measurement and consequently the crop Kc were calculated. The results showed that the method used during the SS is easy and provides a better understanding of actual crop water use and better estimation of crop Kc. The calculated 10-day Kc values for sugar beet under heavy cracking clay soil conditions were: 0.46, 0.49, 0.53 and 0.60; for the initial stage: 0.69, 0.78, 0.88 and 0.97; for the development stage: 1.05, 1.11, 1.13, 1.11 and 1.04; for mid-season stage and for late season stage: 0.92, 0.74 and 0.60. Yield and other sugar related parameters were also presented for the two seasons.
Published in: Journal of Agricultural Science and Technology B;2(8):865-874
URL: http://www.davidpublishing.com/show.html?7690
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