الفهرس | Only 14 pages are availabe for public view |
Abstract Sugar beet was grown under surface drip and solid-set sprinkler irrigation systems in two separate experimental fields. The experimental area was 2000 m2 nearly during the winter seasons of 2017/2018 in El Nubaria cultivated area which represents the dry climate (semi-arid region) and classified as sandy soil to validate the HydroCalc and AquaCrop models. HydroCalc was evaluated under two different lateral lengths (30 and 50 m) and slopes (0 and 0.02) under surface drip and solid-set sprinkler irrigation systems and AquaCrop model was evaluated under irrigated sugar beet crop with different water regimes (100%, 80% and 60% from potential evapotranspiration (Etp). The statistical indicators; the regression coefficient (R² > 0.90) and correlation coefficient confirmed the good performance of HydroCalc in simulating some hydraulic parameters of pressurized irrigation systems. The validation of measured and simulated data from HydroCalc clarified it as efficient reliable software to design pressurized irrigation systems to increase the system performance and water application efficiency. The energy savings were (33.18; 27.33%) with surface drip irrigation systems when using lateral lengths (30; 50m), respectively under slope 0 % and (34.23; 29.54%) under slope 2% with surface drip irrigation systems when using lateral lengths (30; 50m), respectively compared to the solid-set sprinkler irrigation system. It could be concluded to using surface drip irrigation systems with lateral length 30 m and with a slope (2%) downhill for increasing the water application efficiency, decreasing the friction losses along lateral lines and this lead to saving more water head energy. Also, the calibrated AquaCrop model has performed well under water deficit conditions to simulate sugar beet crop variables. Able to simulate well grain yield and water productivity of sugar beet under different irrigation regimes and climate changes in the new reclamation area in the north of Egypt, becoming unsatisfying in high water stress (intensive water stress). Therefore, this model can use as a decision support tool in increasing water productivity by agriculture sectors project managers, consultants, irrigation engineers and farmers. In other words, this model can be used to simulate the water management effects on yield and water unit productivity under climate change scenarios and deficit irrigation for other crops. Also, The root yield and white sugar beet yields obtained under surface drip-irrigation system with 80% from crop potential evapotranspiration (48, 8.05 ton/ha) matched the yield of solid-set sprinkler irrigated sugar beet with 100% of crop potential evapotranspiration (37.39, 7.19 ton/ha) respectively with 30 % water saving during this might be due to the high efficiency of surface drip irrigation system compared to solid-set sprinkler irrigation system. The results showed a significant increase in productivity and white sugar yield by increasing water applied from 60% up to 80 and 100% and attributes of sugar beet (sucrose, purity and extractable sugar percentage) rose with increasing water deficit.The study recommends that: 1. HydroCalc reliable software can be dependably used to design pressurized irrigation systems to increase system performance and water application efficiency. 2. AquaCrop can be dependably used to predict crop variables and evaluating the effectiveness of planning irrigation management strategies for crop variables, however, the limitations should be kept in mind when explaining the results under severe water stress conditions. |