الفهرس 
OPTIMIZING THE IRRIGATION PERFORMANCE OF RAISED BED WHEAT USING THE WinSRFR MODELOnly 14 pages are availabe for public view
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Abstract
This study was carried out at the Sakha Agricultural Research Station during 2019/2020 to determine the effect of the newly raised bed technique on wheat productivity when compared to the traditional basin technique, as well as to analyze the hydraulic performance and optimize the irrigation performance using simulation models. The USDA Agricultural Research Service developed one of the most widely used models, WinSRFR, the latest in a series of surface irrigation hydraulic simulation models. Surface irrigation systems were evaluated, optimized, designed, and managed using WinSRFR. The soil texture was clay, and four irrigation events were performed during the growing season. The statistical analysis was performed using a randomized complete block design (RCBD) by SAS 9.1 software. Raised beds were constructed with a machine obtained from the ICARDA project in Egypt.The experimental site’s measured data was entered into the WinSRFR software to estimate infiltration parameters using the Elliot and Walker method through the use of an event analysis procedure. According to event analysis results, a value for RB130, RB100, and FB were 0.405, 0.309, and 0.208, respectively; in addition to k value for RB130, RB100, and FB were 124.78, 147.401, and 171.759 mm/hra. Based on calibrated infiltration and roughness parameters, Simulation Analysis World was used to evaluate the current furrow and basin irrigation performance, where the AE was 80, 64, and 43 percent for RB130, RB100, and FB, respectively, and the DUlq was 86, 88, and 90 percent for RB130, RB100, and FB, respectively, as the value of the Dp was 20, 36, and 56 percent for RB130, RB100, and FB, respectively. The current irrigation event was over-irrigated because the ADlq value for RB130, RB100, and FB was greater than one.The current irrigation performance on farm for raised beds and flat basins is poor under the current field conditions. As a result, the irrigation method has never been optimized for variable field conditions. So, Physical Design World was used to optimize and develop different design strategies. The results showed that irrigation performance decreased with the increasing length of furrow and basin, so extremely long lengths should be avoided because they result in decreased efficiency and uniformity, as well as high deep percolation loss.In case of difficulty of changing field sizes, irrigation efficiency can be improved by adjusting the inflow rate and time to cut-off through Operation Analysis World in WinSRFR software. According to the analysis, optimizing the inflow rate and cut-off time can increase AE by more than 15%, DUmin by more than 2.5%, and Dp by up to 60% in the RB130 irrigation system, with the best strategy achieving the high irrigation performance when the inflow rate was 2 l/s and the cut-off time was 0.30 hr. Managing the inflow rate and irrigation cut-off for RB100 can increase AE by more than 17% while decreasing Dp by up to 33%, with the maximum AE and minimum DP obtained for a 2 l/s inflow rate and a 0.30 hr cut-off time. When using the Q= 18 l/s and Tco= 0.31 hr strategy for FB method, the AE will increase by more than 23% and Dp decrease by up to 17.5%.