省农林科学院植保所薯病组继81年田间穴施磷肥防治红薯根腐病试验(本刊82年第四期已报道),今年又进一步作了盆栽观察试验.其方法是在病土内分别按照土重加入1%、5%、10%、20%的过磷酸钙,以不加磷肥作对照,分别装盆栽薯.经33天,冲根调查,防病效果极为明显.病情指数从施肥量1%到20%,分别为 Provincial Academy of Agriculture and Forestry Phytophthora paniculata group following 81 years of field application of phosphate fertilizer to prevent sweet potato root rot disease test (reported in the fourth quarter of 82) reported this year and further pot observation was made. The method is in soil According to soil weight, adding 1%, 5%, 10%, 20% of superphosphate, with no phosphate fertilizer as control, respectively, potted potato pot.After 33 days, red root investigation, the effect of disease prevention is extremely obvious. The amount of 1% to 20%, respectively