土壤肥力对板栗枝干病害的影响

通过对土壤肥力与板栗枝干病害关系的研究表明，在土壤物理因素中，土壤类型以粘土、石砾土的栗园发病较重，壤土、沙壤土、黄棕壤的栗园发病较轻；土壤容重与感病指数呈正相关；土层厚度与感病指数呈负相关。在土壤化学因素中，有机质、速效磷与病情呈负相关；pH值、全氮和钾含量与病情关系不显著，并通过对土壤肥力因素与病情关系的逐步回归分析，筛选出土层厚度、土壤容重、粘性土、有机质和速效磷5个因素对病情贡献较大。以此建立了病情预测的回归模型，根据这一模型，可以预测研究范围内的任一给定条件下病害可能发生的水平，该研究将为今后的板栗生产和管理提供指导。

Effect of soil fertility on chestnut stem diseases

Studies on the relationship between soil fertility and chestnut stem disease showed that in soil physical factors, the disease index in the chestnut orchards with clay soil and stone soil was higher than that with loam, sand loam and yellow-brown loam soil. It was increased with the increasing soil bulk density, and decreased with increasing soil depths. In soil chemical factors, the disease index negatively associated with the contents of organic matter and available phosphorus, and not with total nitrogen, K and pH value. Based on the above factors and stepwise regression, five factors such as soil depth, bulk density, clay soil, organic matter and available phosphorus were regarded as important to the disease , and a linear multiple regression model that predicts the development level of the diseases was derived, which could assist in manageming the particular stand against chestnut stem diseases in Anhui Province.