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1982年4月至7月,我们在陕西、河南、甘肃、四川等省的18个县市对泡桐丛枝病发生情况与环境因子的关系进行了调查,对调查的土壤资料应用通径分析的方法进行了研究。结果发现土壤中磷钾含量与泡桐丛枝病感病指数有密切的关系,磷含量愈高,发病愈轻,含量愈低发病愈重,钾的影响与其相反,而且磷钾含量之比值(P/K)与感病指数成反相关。这就为泡桐丛枝病的防治提供了新的途径。
From April to July 1982, we investigated the relationship between the occurrence of Paulownia witches’ broom disease and environmental factors in 18 counties and cities in Shaanxi, Henan, Gansu and Sichuan provinces. From April to July 1982, we used the path analysis Methods were studied. The results showed that the content of phosphorus and potassium in soils was closely related to the susceptibility index of Paulownia witches’ broom disease. The higher the phosphorus content was, the less incidence was. The lower the content was, the heavier the disease was, the more the effect of potassium was. In contrast, the ratio of phosphorus to potassium / K) is inversely related to the susceptibility index. This provides a new way for the prevention and treatment of Paulownia witches broom disease.