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植物需要肥料,正与人需要食粮相同。植物需要肥料主要有三种,这是大家所知道的,就是氮、磷、钾三项。在中国科学未发达以前,农民采用肥料,大率是以粪便、草灰、堆肥、豆饼,以及马牛猪羊等牲畜之粪与骨。主要含氮者为粪便豆饼之类。但牲畜之粪中亦含有磷,主要含磷者为猪牛羊之骨。主要含钾者,为草灰和稻麦及其他五榖之藁灰。但一切植物经过燃烧之后,含氮
Plants need fertilizer, just like people need food. There are three main types of plants that require fertilizers. This is what we all know, that is, nitrogen, phosphorus and potassium. Prior to the underdevelopment of science in China, peasants used manure and their rates of excrement and bone were mainly from manure, grass ash, compost, bean cake, and livestock such as horses and pigs. The main nitrogen-containing manure bean cake and the like. However, livestock manure also contains phosphorus, the main phosphorus-containing bone of pigs and sheep. The main potassium, for the grass and rice straw and other five 榖 of gray. But after all the plants have been burned, they contain nitrogen