双株定向栽培模式对玉米弯孢菌叶斑病发生流行及玉米产量的影响

通过两年田间小区试验,观察比较双株定向栽培模式和常规栽培模式下玉米弯孢菌叶斑病发生流行动态及对玉米产量的影响。结果表明,双株定向栽培模式下玉米弯孢菌叶斑病的病情重于常规栽培模式,适合病害发生的环境条件下病情差异更为明显。应用Logistic模型推导两种栽培模式下病害的流行时期,双株定向栽培模式的指数增长期及衰退期较常规栽培模式短,而逻辑斯蒂增长期则长4~5 d,说明双株定向栽培模式更适合病害的发生与流行。双株定向栽培的玉米产量高于常规栽培,但随着两者病情差距的扩大,增产优势会降低。

Effects of Two-plants Orientation Cultivation Pattern on the Maize Yield and Occurrence and Epidemic of Curvularia Leaf Spot

Through the field experiments for two years, influences of two-plants orientation cultivation pattern and conventional cultivation pattern on the occurrence and epidemic and maize yield of curvularia leaf spot were studied. The results showed that the disease was even more severe under two-plants orientation cultivation pattern than that of conventional cultivation pattern and the disease differences was more obvious under suitable environmental conditions. Epidemic phases under the two cultivation patterns derived from the Logistic models showed that the exponential growth period and recession period under two-plants orientation cultivation pattern were more shorter than those of conventional cultivation pattern and the logistic growth phase was 4 to 5 days longer accordingly which indicated that two-plants orientation cultivation pattern was more favorable to disease epidemic. Maize yield under two-plants orientation cultivation pattern was higher than that of conventional cultivation pattern, but with the expansion of the disease differences, this will reduce the yield advantage.