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长效氮素化肥的设想并不新奇,但是过去由于成本过高,无法普遍使用。几年来经过研究已有可能使这种化肥在普遍使用上合乎经济原则。制造长效的氮素化肥不外有几种途径,其一是制造一种溶解缓慢的化合物如尿
The concept of long-term nitrogen fertilizer is not new, but in the past due to high costs, can not be used universally. Research over the years has made it possible to make this fertilizer economically viable for general use. There are several other ways to create long-lasting nitrogen fertilizers. One is to make a slow-dissolving compound such as urine