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在美国,许多农场正在采用将化学品混入灌溉水中施用的灌溉系统,这种灌溉方法叫做化学灌溉。灌溉水中掺进的化学品起初只有肥料,后来发展到除草剂、杀虫剂、杀菌剂及杀线虫剂。据估计,目前美国化学灌溉的耕地面积在520万公顷以上。化学灌溉系统由6个部分组成,包括灌溉泵、药剂注入泵、化学品贮存容器、校准装置、回流阻止系统及安全设
In the United States, many farms are using irrigation systems that incorporate chemicals into irrigation water, a method known as chemical irrigation. Chemicals incorporated in irrigation water were initially only fertilizers and later developed into herbicides, insecticides, bactericides and nematicides. It is estimated that currently the area of cultivated land for chemical irrigations in the United States is above 5.2 million hectares. The chemical irrigation system consists of six components, including irrigation pumps, drug injection pumps, chemical storage containers, calibration equipment, backflow prevention systems and safety equipment