氮肥合理施用的基本出发点是如何减少氮素损失,提高氮肥利用率,充分发挥氮素化肥的经济效益。据统计我国氮肥的利用率大约在50%左右,若按我国氮肥施用量估算,每年将有几百万吨氮肥没有真正发挥增产作用,这不仅造成经济和能源的浪费,而且损失的氮素还 The basic starting point for the rational application of nitrogen fertilizer is how to reduce the nitrogen loss, improve the utilization rate of nitrogen fertilizer and give full play to the economic benefits of nitrogenous fertilizer. According to the statistics, the utilization rate of nitrogenous fertilizer in our country is about 50%. According to the estimation of the amount of nitrogenous fertilizer in our country, there will be several million tons of nitrogenous fertilizer that will not really play an increasing role in production every year. This will not only cause economic and energy waste but also loss of nitrogenous