Investigation of effective factors on water use efficiency of border irrigation at actual and extensible root zone depth of wheat in Hamidieh (Khuzestan)

This study was conducted to investigate changing of border dimension and the root zone depth in Hamidieh Khuzestan on water application efficiency. Soil of site has heavy soil texture (Clay Loam) and investigation in three farms base of usual method of farmer and direct measurement to calibration of WIN-SRFR model in 2015 was applied. The effective depth of root development of wheat (Chamran verities) 100 days after planting date (Late February ,After flowering) about 40 cm and water application efficiency in border irrigation in farmer situation about 30% were determined. The simulation results by this model in condition of 40 cm root zone depth and 50 cm net depth of irrigation water show that with 18 lit/s discharge, 3-3.5 h cutoff time and border dimension with 180 m length and 10 m width, the possibility of increasing water application efficiency is up to 40% is provided. If root zone depth and net depth of irrigation water increase respectively 50cm and 70 mm (In condition of improving soil) can be water application efficiency increased to 50% in proposed condition that percent relative increase is about 33% more than farmer situation. So by applied convenient operation plowing and soil emendation and also correction of border dimension and irrigation management can be increase percent relative increase of water application efficiency up to 66 percent in comparison of farmer condition.