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一、引 言 在美国,使用液体混合肥料或悬浮肥料已经日益普遍。在这个国家的第一间液体肥料工厂是1923年在加利福尼亚建立的。最近,由化肥管理职员协会和田纳西州流域管理局组织的一个调查指出,1980年美国有3200多间液体肥料工厂,平均每个工厂每年大约生产6000吨,同时一些公司则生产了二十万吨混合肥料。 实际上,作为一种物质,混合肥料或悬浮肥料可以叫做”液态复合肥”(Compundfertilizer in a fluid form),它含有
I. INTRODUCTION In the United States, the use of liquid compost or suspended fertilizer has become increasingly common. The first liquid fertilizer plant in the country was established in California in 1923. A survey recently organized by the Fertilizer Management Staff Association and the Tennessee Valley Authority found that in the United States in 1980 there were more than 3,200 liquid fertilizer plants, with an average of about 6,000 tons per plant per year, while some companies produced 200,000 tons Mixed fertilizer. In fact, as a substance, a compost or suspended fertilizer can be called Compundfertilizer in a fluid form, which contains