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许多农户正在使用将农业化学品混入灌溉水中施用的灌溉系统,这种方法称为化学灌溉(Chemigation)。化学灌溉中使用的化学品包括肥料、除草剂、杀虫剂、杀菌剂、杀线虫剂、植物生长调节剂和生物农药。在过去几年中,化学灌溉的使用迅速扩大,美国在1985年化学灌溉的耕地面积估计为520万公顷。化学灌溉系统由下列几个部分组成:灌溉泵、药剂注入泵、化学品贮存容器、校准装置、回流阻止系统和有关安全设备。
Many farmers are using irrigation systems that incorporate agrochemicals into irrigation water, a process known as Chemigation. Chemicals used in chemical irrigation include fertilizers, herbicides, insecticides, fungicides, nematicides, plant growth regulators and biopesticides. In the past few years, the use of chemical irrigation has rapidly expanded. The area of arable land for chemical irrigation in the United States in 1985 was estimated at 5.2 million hectares. The chemical irrigation system consists of the following components: irrigation pump, chemical injection pump, chemical storage container, calibration device, backflow prevention system and related safety equipment.