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Minqin county is located in the downstream of Shiyang the Oasis the Mainland table water more lack of groundwater over-exploitation . Sustainable development of agriculture depends on the rational development and utilization of water resources , water-saving irrigation in open source is unsustainable situation in the future sustainable development of agriculture one of the main measures . Oasis of drip irrigation , semi - permanent sprinkler and channel seepage irrigation cotton test , drip irrigation is divided into three different irrigation quota processing , semi - permanent sprinkler coated and not coated two processing simultaneously seepage canal irrigation test . After one growing season, the study results show that the boll rate bolls , seed number , boll weight , hoe up soil around plants yield indicators , drip irrigation , semi - permanent sprinkler were less than the seepage canal irrigation , but refers to clothing , lint percentage , fiber length , yield, water productivity indicators better than semi - permanent sprinkler , drip and anti-seepage canal irrigation . Drip irrigation experiment , the indicators showed a decline with the reduction of irrigation quota , 60% of the irrigation quota handle a greater degree in the blooming period , limiting the growth and development of the cotton plant , boll stage the irrigation quota should not be used for irrigation , but should be appropriate to increase the irrigation quota . Cotton production with irrigation, water consumption and water productivity and water consumption are approximated by a quadratic curve . Unit of production between different irrigation methods exist very significant difference , 80% of field capacity irrigation highest yield , seepage canal irrigation followed , the lowest yield of the sprinkler ; drip irrigation for different irrigation quota on production significantly , along with irrigation quota decrease in the yield decreased . Different drip irrigation quota production , irrigation and water consumption available quadratic fitting, and the yield available planting density , of monoclonal effective boll number and boll number to predict , the equation can be described as y = -4046.21 0.04468X , < sub > 1 393.78X 2 820.23X 3 , the multiple correlation coefficient R = 0.903. With flood irrigation
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