需要控制肥料养分释放的理由很多,例如:养分供应速率更好地适应作物的生理需要可以获得增产,或者提高肥料利用率,在经济上和环境保护方面可带来好处,在生产管理方面也有好处:田间操作较少,从而节省劳力。此外还有间接的好处,就是机械对作物的损伤或对土壤结构的破坏较少。长效肥还适于解决某些特殊的问题,如有效养分的固定等。科学家和农民已经认识到长效肥的潜在用途。已经发表了许多文章,仅最近十年已不下数百篇。但在农业上的应用很慢,主要限于某些特殊的作物。 There are many reasons that need to be taken to control the release of nutrients from fertilizers. Examples are nutrient supply rates that better adapt to the physiological needs of the crop, increase yields, or increase fertilizer use efficiency, which can be both economically and environmentally friendly and good for production management : Field operations less, thus saving labor. In addition, there is an indirect benefit that mechanical damage to the crop or damage to the soil structure is less. Long-acting fertilizer is also suitable for solving some special problems, such as the effective nutrient fixation. Scientists and farmers have recognized the potential use of long-acting fertilizer. Many articles have been published, with no fewer than a few hundred in the last ten years alone. However, its application in agriculture is very slow, mainly limited to some special crops.