农业生产是利用绿色植物进行能量转换的物质循环过程，化肥是农作物生长发育的粮食，是提高单产的物质基础。据联合国粮农组织统计，世界粮食产量的提高，其中靠单产的提高占78％，而在提高单产中，化肥的增产作用占40％－70％。即化肥在提高产量方面起着十分重要的作用。一、? Agricultural production is the process of material recycling using green plants for energy conversion. Fertilizers are the grain for the growth and development of crops and the material basis for increasing yields. According to the UN Food and Agriculture Organization of the United Nations, the world’s grain output has increased by 78% of the increase in yield, while in increasing yields, the yield increase of fertilizers accounts for 40% -70%. That is, fertilizer plays a very important role in increasing production. one,?