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我国的水资源并不丰富,特别是干旱半干旱地区,农田灌溉缺水相当突出。为解决供需水之间的矛盾,不少地方都在研究节水的灌溉制度,有的在灌溉上采用灌“关键水”的方法,有的研究经济的灌溉定额,即在向农田供水的总水量一定的条件下获得最大的收益,或者获得一定收益时耗费最小的灌溉水量。这与过去传统的丰产灌溉绝然不同,它是通过减少灌溉水量或灌溉次数扩大灌溉面积增加总产来获得最大的收益。然而灌溉次数和灌溉定额的减少就会影响产量的提高,影响的大小与作物不同生育阶段缺水量有关,可根据联农组织所推荐
China’s water resources are not rich, especially in arid and semi-arid areas, farmland irrigation water shortage is quite prominent. In order to solve the contradiction between water supply and demand, many places are studying the water-saving irrigation system. Some adopt the method of “key water” for irrigation. Some study the economic irrigation quotas, that is, the total water supply to farmland Get the maximum profit under the condition of certain amount of water, or get the least amount of irrigation water when gain certain income. This is fundamentally different from the traditional high-yield irrigation in the past. It achieves the maximum benefit by increasing irrigation area and decreasing total output by reducing the amount of irrigation water or irrigation. However, the decrease of irrigation frequency and irrigation quota will affect the increase of yield. The impact of crop yield is related to the water deficit at different growth stages of the crop. According to the recommendation of the FAO