Effects Of Water-Saving Irrigation Patterns On Integrated Benefits Of Cotton In Deserted Oasis Of Minqin

The drought is the major reason of desertification in the Minqin County, which even limited the continuous development of agriculture there. So the Water Saving Irrigation is mostly considered to promote agriculture's development in the future. This paper, studying the irrigation in the Minqin Oasis, made an improved irrigating regulation to reduce the conflict between the supply and requirement of water and raise the utilization efficiency of water source. The detailed means is proposed to apply the Water Saving Irrigation in the dry west area, based on the feasibility study of representative hungriness section. It is also a theoretical reference for all the droughty or semiarid area of north-west.In the oasis, trial of irrigating cotton is done by three different ways, which is drip irrigation, semifixation spray irrigation and seepage-preventing ditch irrigation. Thereinto, drip irrigation is divided into three treatments of different ration. Tectorial and untectorial treatment are adopted to semifixation spray irrigation. At the same time, seepage-preventing trial is done. By study of one growth season, it shows that the indexes, Comparing with flood irrigation, water-saving technique has the effect of increasing production and harvest, economizing water, energy sources and field, saving work, time and power. It has best significance difference among unit yield of using different irrigation ways. The highest yield is in irrigation treatment of 80% field moisture capacity, it is secondary in seepage-preventing ditch irrigation treatment and is the lowest in spray irrigation treatment. Drip irrigation increase yield 4.0%~25.9%,Seepage-preventing ditch irrigation increase yield 17.5%, and spray irrigation decrease yield 22.4～37.8% comparing with flood irrigation. The effect to yield is obvious in drip irrigation treatment of different irrigation ration. Yield decreases with reducing of irrigation ration.drip irrigation economize 47.7~54.4% water,Seepage-preventing ditch irrigation economize 38.56% waterand spray irrigation economize 58.2% water comparing with flood irrigation. Seepage-preventing ditch irrigation,...