小麦黑点病影响因素的研究

通过对各项试验小麦黑胚率的调查分析可知 ,土壤对小麦黑点病的发生有较大的影响 ,以淤土黑胚率最高 ,两合土、砂姜黑土较低。在施用一定的P、K条件下 ,拔节期追施氮肥小麦黑胚率降低 ,且随总施氮量的增加而降低 ;孕穗期及其以后追肥小麦黑胚率增加 ,且随施氮次数和施氮量的增加而提高 ;尤其扬花期叶面喷施氮肥会较大幅度地提高黑胚率。扬花期喷施杀菌剂 ,以三唑酮效果较好而且稳定。小麦黑胚率随播期的推迟而提高 ,呈显著正相关 ;播量增加黑胚率提高 ,但相关不显著。

Studies Factors of Affecting Wheat Black Point Disease

Investigation on the wheat's rate of the dark embryo shows that the soil has great influence on the occurrence of the dark point disease,with the highest rate of dark embryo silt and a lower rate in two-combined soil and sand plasm soil. Under the condition of some amount of using P and K,the rate of dark embryo will decrease while spraying the nitrogen fertilizer in jointing stage the rate will be the lowest,with the increase of the nitrogen fertilizer.Any other agricultural chemicals may raise the rate. A spray of antiseptic triadimefon will be more effective and stable in flowering stage. The rate of dark embryo raises with the delay of seeding stage and their the mutuality is significantly positive.The increase of seeding rate will cause the raising of the rate, but the mutuality is negative.