专用肥的应用与其增产效果钟宝龙（浙江省农业厅土肥站）专用肥是根据土壤特性，植物需肥规律，因地制宜科学研制的适宜对象植物按预定目标生长不可替代的肥料。早在１９５０年，德、美等国就开始专用肥的实践，到１９８７年全美已有５０００个生产专用肥厂家，１．２万个... Application of special fertilizer and its effect Zhong Bell (Zhejiang Provincial Department of Agriculture Soil and Fertilizer Station) special fertilizer is based on soil characteristics, fertilizer laws of plants, according to local conditions, scientific research and development of suitable plants according to the intended goal of growing irreplaceable fertilizers. As early as 1950, Germany, the United States and other countries started the practice of fertilizer, to 1987 the United States has 5000 production fertilizer plant, 12,000 ...