通常认为化学氮肥利用率比较低的主要原因,是由于施入土壤的水溶性氮肥被流失、挥发以及反硝化作用等而遭到损失。因此,制造一种能够在一定时间内缓慢释放而又能满足作物需要的肥料——长效肥料便日益受到了有关部门的重视。长效肥料应具有这样 The main reason for the relatively low utilization of chemical nitrogen fertilizer is generally believed to be that the water-soluble nitrogen fertilizer applied to the soil is lost due to loss, volatilization and denitrification. Therefore, to produce a kind of fertilizer that can be slowly released within a certain period of time and can meet the needs of crop - long-acting fertilizer is increasingly valued by relevant departments. Long-term fertilizer should have this