我国是化肥消费大国,使用量已居世界之首。2004年我国化肥产量达4519.8万吨,其中氮肥为3304万吨,尿素是氮肥的主要品种,约占氮肥总量的60％。化肥在我国农业生产中占有非常重要的地位,如果没有化肥,恐怕一半的中国人现在要饿肚子。联合国粮农组织的统计资料表明,在提高单产中,化肥对增产所起的作用占40％-60％,我国农业部门也认为在40％左右。 China is a big country for fertilizer consumption, and its usage is the highest in the world. In 2004, China produced 45,198,000 tons of chemical fertilizers, of which 33,040,000 tons were nitrogenous fertilizers. Urea was the main nitrogenous fertilizer and accounted for about 60% of the total nitrogenous fertilizers. Fertilizer occupies a very important position in China’s agricultural production, if there is no fertilizer, I am afraid that half of the Chinese people are hungry now. Statistical data from the UN Food and Agriculture Organization shows that in increasing yields, the role of chemical fertilizers in increasing production accounts for 40% -60%, and the agricultural sector in our country also considers about 40%.