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In this study, by choosing wheat, corn, potato, sunflower, flax five crops in planting different irrigation levels designated location test, water consumption and water use of different crops and cropping patterns of the Ningxia Yellow River Irrigation efficiency study, selected on the basis of water-saving crops and their combination mode, combined with a regional survey of crop planting structure optimization and adjustment. Considering irrigation district water supply and demand balance, ecological, economic, and social benefits of harmonization, and on this basis to establish Ningxia Yellow River Irrigation of crops and cropping patterns multi-objective optimization model, and optimize the results were evaluation. A different irrigation levels designated location experiment in 2003-2004 at the Agricultural College of Ningxia University Proving Ground, monoculture wheat - corn silage, corn, monoculture potato monoculture oil sunflower, single flax, spring wheat / corn six kinds The planting pattern test treatment of the different levels of irrigation, irrigation of the crop growing period, irrigation frequency, water consumption, yield water utilization analysis through test to find out optimal irrigation mode under each crop and cropping systems . 1.1 Test results show that the irrigation levels on spring wheat, Huma Sheng incubation period of more obvious, irrigation is too small will cause growth to speed up the process and precocious, and irrigation too much will cause excessive vegetative growth caused by the greed green late-maturing, irrigation too much will shorten potato growing period. Crop leaf area and biomass changes with irrigation levels vary, but each crop is basically the interim before the birth irrigation amount is the greater, the greater the amount of growth in leaf area and total dry matter accumulation, cumulative, the faster to the late growth stage, the processing of high irrigation amount decreased dry matter accumulation speed. 1.2 different irrigation levels for various crops and their cropping patterns under water composition ratio. With the increase in the amount of irrigation, irrigation amount of the proportion of the total water consumption has skyrocketed, the proportion of the total water consumption of the soil water and precipitation is plummeting. The growth period of the crop water consumption mode coefficients also vary with the irrigation levels, under the conditions of the test, the whole spring wheat water consumption period in jointing - heading stage, water consumption mode coefficients of 34.5-48.8%, Second is heading - grouting and grouting - a mature stage; corn water consumption period in jointing - bell stage, 32.7% -46.5%, in addition to the seedling stage processing irrigation and other processing sowing - jointing stage water mold minimum coefficient; period of potato largest water is in the tuber formation period, up to 60% or more, followed by a tuber growth period; the oil sunflower seedling and budding stage water up to a relatively small, flowering and grain filling stage. Deal with bacteria and squaring of the irrigation water consumption coefficient of 31.5% -42%, a certain amount of irrigation can increase the oil sunflower growing mid-water consumption, particularly evident in the budding stage; flax in water up bud to flowering stage , seedling and grain filling stage is relatively small. Under the 1.3 irrigation level of impact on crop production and value have different levels of crop monoculture conditions, the yield increased irrigation amount parabolic change. The test results show that the monoculture spring wheat irrigation quota 4950m 3 · hm -2 when the highest yield reached 7916kg · hm -2 . Spring wheat - the yield of silage corn silage maize cropping patterns spring wheat irrigation situation, early jointing stage supplemental irrigation in corn silage 900m 3 · hm -2 water, corn silage biological yield up to 51434kg hm -2 . Monoculture corn irrigation quota for 3150 m 3 hm -2 the highest yield, up to 13252kg · hm -2 . Spring wheat / corn irrigation levels reached 8100m 3 · hm -2 of the highest yield, wheat 4820kg · hm -2 corn 9938kg · hm -2 . Test, potatoes tubers yield the highest form the early filling a water reached the lowest yield 52445kg · hm -2 , irrigation and irrigation of the Four Rivers. Oil sunflower yield in irrigation water, irrigation 1050m 3 · hm -2 when the highest yield up to 4186kg · hm -2 , filling the lowest yield of the Four Rivers. Flax in irrigation water, irrigation quota 2400m 3 · hm -2 when the highest yield reached 2540kg · hm -2 . 1.4 crop output value changes under different irrigation levels and yield trends are basically the same, but the crop there is a large difference between the output value between. The test results show that the monoculture spring wheat - silage corn, spring wheat monoculture potato, spring wheat / corn output is relatively high in the highest crop yields when the output value of single - silage corn, followed by potatoes and spring wheat / corn monoculture monoculture
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