| Application in west liaohe area irrigation water use efficiency test and analysis,sorting out area present situation of irrigation water use efficiency,grasp the dynamic changing irrigation irrigation water use efficiency,to accelerate the construction of irrigation area and promote the comprehensive management,promote the agriculture water saving work,construction of water-saving society as soon as possible,to complete the autonomous region government "qualification of the most stringent water management" task assessment index,ensure food security in our country,promote the grassland ecological construction,etc,all have very important strategic significance.Based on the combination of indoor and outdoor experiments and theoretical analysis as the means,the soil fertility,crop varieties,meteorological factor and agricultural measure equal,horqin district,left banner,kailu county,three representative sample points according to the conventional ground irrigation,irrigation pipe,sprinkler irrigation and drip irrigation methods,of the four types under different irrigation area of irrigation water use coefficient of experimental research.Based on the analysis of irrigation water utilization coefficient,WUE and marginal benefits of different irrigation methods in Xiliaohe well irrigated area in Tongliao City from 2013 to 2015,the following conclusions are drawn:(1)The utilization coefficient of irrigation water for pipeline irrigation in xiliaohe plain was 0.783;Spraying irrigation was 0.851.Drip irrigation was 0.866.The conventional ground irrigation was 0.635.(2)In terms of the increase rate of WUE,compared with traditional surface irrigation,the high-efficiency water-saving irrigation increased by 41.57%,27.42% and 22.37%,respectively.(3)The water-saving cost increases from 2.84 yuan /m~3 of pipe irrigation to 8.51 yuan /m~3 of sprinkler irrigation,and then to 3.87 yuan /m~3 of drip irrigation.The water-saving benefit first increases,then decreases and then increases,among which the water-saving benefit(grain increase)decreases from 6.70 yuan /m~3 of pipe irrigation to-7.19 yuan /m~3 of sprinkler irrigation and then increases to 4.41 yuan /m~3 of drip irrigation.The results show that the water-saving technology with high input has significant water-saving effect for simple grain crops,but the effect of increasing production and income is not significant.(4)To ensure the sustainable development of xiliaohe Plain area,agricultural water-saving must be further promoted in the construction of pipeline irrigation and drip irrigation.The analysis shows that the total water resources for agricultural irrigation can be reduced by 263 million m~3,so as to realize the balanced development of soil and water resources. |
