我们在1964—1965年曾进行甘薯施用磷肥的效果和方法的试验,结果以用5％过磷酸钙液蘸苗的方法最为经济简便有效,小区平均亩产(小区面积0.03亩,重复3次)此对照增加476斤,增产18.3％。每亩用过磷酸钙40斤施于苗床、作基肥、进行根外追肥等处理仅比对照增产1—7.7％。 We conducted experiments on the effect and method of applying phosphate fertilizer in sweet potato in 1964-1965. The results showed that the method of dipping the seedlings with 5% superphosphate was the most economical, simple and effective, and the average mu plot area (plot area 0.03 mu, repeated 3 times) This control increased 476 pounds, an increase of 18.3%. Per acre 40 kg of superphosphate applied to the seedbed, as a base fertilizer, top dressing and other treatment only increased 1-7.7% compared with the control.