我县甘薯施用磷酸二氢钾,1982年不到1,000亩,1983年扩大到4.7万亩,占春、夏薯种植面积的15.7%。在施用方法上不论是浸种、蘸秧,中期追施,裂缝期灌根或叶面喷施,均取得不同程度的增产效果。1982—1983年,我们还进行了磷酸二氢钾早期灌根试验,大面积示范的结果,比不灌根的增产23.8%,比裂缝期 I County potassium dihydrogen phosphate application, in 1982 less than 1,000 acres in 1983 to expand to 4.7 million mu, accounting for spring and summer potato acreage of 15.7%. In the application method, no matter soaking, dipping seedling, mid-term topdressing, irrigation or foliar spraying stage, all achieved different levels of yield-increasing effect. In 1982-1983, we also carried out the early irrigation experiments with potassium dihydrogen phosphate. The results of a large area demonstration showed a 23.8% increase over the non-irrigated roots,