Impact of Irrigation Systems, Fertigation Rates and Using Drainage Water of Fish Farms in Irrigation of Potato under Arid Regions Conditions

Abstract

Two field experiments were carried out during growing seasons 2011 and 2012, it executed in research farm of National Research Center in Nubaryia region, Egypt to study the effect of irrigation systems, fertigation rates and using the wastewater of fish farms in irrigation of potato crop under sandy soil conditions. Study factors were irrigation systems (sprinkler irrigation system ―SIS‖ and drip irrigation system ―DIS), water quality (irrigation water ―IW‖ and drainage water of fish farms ―DWFF‖) and fertigation rates (FR1= 20%, FR2= 40%, FR3= 60%, FR4 = 80% and FR5= 100% from recommended dose from NPK).The following parameters were studied to evaluate the effect of study factors:(1) Chemical and biological description of drainage water of fish farms. (2) Clogging ratio of emitters (3) Yield of potato, (4) water use efficiency of potato. Statistical analysis of the effect of the interaction between study factors on yield, water use efficiency of potato indicated that, maximum values were obtained of yield of potato under SIS x FR5 x DWFF, also indicated that, there were no significant differences for yield values under the following conditions: SIS x FR5 x DWFF > SIS x FR4 x DWFF > SIS x FR3 x DWFF > DIS x FR5 x IW this means that ruse drainage water of fish farming as a new resource for irrigation and rich with organic matter and it can improve soil quality and crops productivity and reduce the total costs of fertilizers by adding minimum doses from minerals fertilizers and sprinkler irrigation system is the best irrigation system which can be used..