深松土壤病原真菌数量分布对玉米病害发生趋势的影响

取玉米深松田10～40 cm 4个土层深度的土样，分析玉米病原菌变化对玉米病害的影响。结果表明，深松田土壤中的玉米致病菌、非致病菌和有益菌数量较常规耕作农田有大幅度增加。玉米病原菌数量在耕层中呈上下两层少中间多的纵向分布趋势。深松年限越长，致病菌数量越多，使玉米病害呈逐年加重趋势，增幅在23.0%～36.8%。

Effects of Occur Tendency of Maize Diseases by Pathogenetic Fungi Distribution in Subsoiling Fields

Maize soil environments were changed by practicing the soil subsoiling technique for more years continuously. The types and numbers of the pathogenetic fungi of the stratified sampling from 10 cm to 40 cm in the subsoiling fields were analyzed. The results showed that the numbers of the maize pathogenetic fungi, non-pathogenetic fungi and useful fungi were increased significantly in the subsoiling soil than the conventional tillage. The distribution tendency in depth of the maize pathogenetic fungi numbers from the middle-level in the subsoiling soil were more than the top and bottom soil layers. The longer subsoiling time, the more the pathogenetic fungi numbers will be, and maize diseases were made or become heavier. The increased range of the maize diseases were in between 23.0% - 36.8%.