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鉴于我国大多数省份氮肥施用量过高,致使肥料中氮的利用率全国平均约35%,有的省份仅20%左右,个别蔬菜大棚不到10%,造成养分大量损失,污染环境。为提高氮肥利用率,国外普遍采用在水溶性氮肥表面包上一层有机聚合物薄膜,以延缓或控制氮的溶出速度,称为包膜肥料。而郑州大学工学院
In view of the excessive nitrogen fertilizer application in most provinces in China, the utilization rate of nitrogen in fertilizers is about 35% of the national average, only about 20% in some provinces and less than 10% in individual greenhouse. As a result, a large amount of nutrient is lost and the environment is polluted. In order to improve the utilization rate of nitrogen fertilizer, foreign countries generally adopt a layer of organic polymer film coated on the surface of water-soluble nitrogen fertilizer to delay or control the rate of nitrogen dissolution, which is called coated fertilizer. Zhengzhou University Institute of Technology