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尽管我国耕地面积不到全世界总量的10%,但化肥施用量却接近世界总量的1/3,已成农业面源污染的主要原因。中国科学院南京土壤研究所研究员、面源污染治理技术研发中心主任施卫明根据多年来对水稻主产区的调查发现,我国稻田氮肥施用量比日本和韩国多20%,与泰国、越南相比,施用量就更高了。跟零星种植粮食的农民相比,种粮大户化肥施用量反而较少,因为大户对农本投入的考虑更多。较合理的尿素用量是每亩32公斤左右,现在只
Although the area of arable land in our country is less than 10% of the total amount in the world, the application rate of chemical fertilizer is close to one-third of the total amount in the world, which has become the main cause of agricultural non-point source pollution. Shi Weiming, a researcher at the Nanjing Institute of Soil Science, Chinese Academy of Sciences, and director of the Research and Development Center for Non-point Source Pollution Control, found that the amount of nitrogen fertilizer used in paddy fields in China was 20% more than that in Japan and South Korea. Compared with Thailand and Vietnam, The amount is higher. Compared with the sparsely populated grain farmers, the large amount of chemical fertilizers on the other hand, less, because the big farmers to invest more consideration. A reasonable amount of urea is about 32 kg per mu, and now only