近期内,我国值得推广的肥料首先应该是改性肥料,即以现在已生产的肥料品种进行改性技术,使肥料的质量得到提高,如长效氮肥和包膜肥料。1.长效氮肥由于氮肥的用量最大,损失也大,因此提高氮肥利用率为国内外科学家所重视。我国的氮肥品种主要是碳酸氢铵(简称碳铵)和尿素。按1998年氮肥结构看,碳铵占48%,尿素占43%。因此,碳铵和尿素成为改性技术的首选产 In the near future, the fertilizer that we should popularize in China should first be modified fertilizer, that is, the modified fertilizer technology should be used to improve the quality of fertilizer, such as long-term nitrogen fertilizer and coated fertilizer. 1. The long-acting nitrogen fertilizer has the largest amount of nitrogen fertilizer, and the loss is also large. Therefore, raising the nitrogen fertilizer utilization has been paid much attention by scientists at home and abroad. China’s nitrogen fertilizers are mainly ammonium bicarbonate (abbreviated as ammonium bicarbonate) and urea. According to the structure of nitrogen fertilizer in 1998, ammonium bicarbonate accounted for 48% and urea accounted for 43%. Therefore, ammonium bicarbonate and urea become the production of choice for modification