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不同作物或作物生育期不同,需要养分的种类、数量及其比例各不相同。单施一种肥料,常不能满足作物的要求。根据作物需要和土壤供肥特点,配制各种复混肥,是夺取作物丰产的一项重要措施。我国复混肥的研制始于五十年代中期,起步不算很晚,但发展不快。1983年的化肥产量以有效成份N、P_2O_2、K_2O计共1378.9万吨,居世界第二位,品种几乎全是单一肥料,高浓度复肥只占化肥总产量的1.8％,且主要靠进口。其中低浓度氮肥碳酸氢铵(简称碳铵)占氮肥总产量的58％,磷肥的70％是过磷酸钙(简称普钙)。由于化肥生产的这种情况,当前农业生产上还是以施用单一肥料为主,使用高浓度
Different crops or crop growth period, the types of nutrients needed, the number and proportion of different. Single application of a fertilizer, often can not meet the requirements of the crop. According to crop needs and soil for fertilizer characteristics, the preparation of a variety of compound fertilizers, is an important measure to seize crop yield. Development of China’s compound fertilizer began in the mid-fifties, the start is not too late, but the development is not fast. In 1983, the output of chemical fertilizers accounted for 13,789,000 tons of active ingredient N, P_2O_2 and K_2O, ranking second in the world. The varieties were almost all single fertilizers. The high-concentration compound fertilizers only accounted for 1.8% of the total output of fertilizers, and mainly relied on imports. Among them, low concentration of ammonium bicarbonate (referred to as ammonium bicarbonate) accounted for 58% of total nitrogen production, 70% of phosphate fertilizer is superphosphate (referred to as calcium). Due to this situation of fertilizer production, the current agricultural production is still based on the application of a single fertilizer, the use of high concentrations