无机肥料出现以前,蔬菜生产者常用的肥料是家畜粪肥和能与蔬菜和其他农作物轮作且具有改良土壤作用的豆科绿肥。在美国中部平原几个州,专业农作物的发展,生产出大批商品饲料,形成大量的有机肥。如果不及时利用或贮存,这种有机肥料就会污染地上水源,并污染环境。无机肥料中的硝酸盐和磷给地上水源、湖泊和河流带来污染的事实,已有许多报道(Porter,1975)。这些问题可通过应用一套新的耕作制度,即应用有机肥料甜到了解决。因此,我们在滴灌和 Prior to the advent of inorganic fertilizers, commonly used fertilizers for vegetable producers were livestock manure and leguminous manure that could be rotated with vegetables and other crops and had a soil-modifying effect. In several states in the Central Plains of the United States, the development of specialized crops has produced large quantities of commercial feedstuffs, forming large quantities of organic fertilizer. If not used or stored in time, this organic fertilizer will pollute the groundwater source and pollute the environment. The fact that nitrate and phosphorous in inorganic fertilizers contaminate groundwater sources, lakes and rivers has been reported (Porter, 1975). These problems can be solved by applying a new cropping system that uses organic fertilizers. Therefore, we are drip irrigation and