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前言近年来我国化肥工业除小化肥厂生产碳酸氢铵外,高浓度氮含量的尿素化肥工业逐渐兴建,尿素将是氮素化肥的重要品种之一。尿素与其它常用氮肥不同,它是
Preface In recent years, China’s fertilizer industry in addition to a small fertilizer plant to produce ammonium bicarbonate, the high concentration of urea nitrogen fertilizer industry gradually built, urea will be one of the important varieties of nitrogen fertilizers. Urea and other commonly used nitrogen fertilizer is different, it is