种植密度和肥力对大蒜叶枯病的影响

Effects of Planting Density and Fertility on Garlic Leaf Blight

[目的]了解种植密度和肥力对大蒜叶枯病的影响,为大蒜的优质高产提供参考。[方法]通过大田试验研究了成都温江地区种植密度和肥力对大蒜叶枯病的影响。[结果]大蒜叶枯病发生存在2个发病高峰期,分别在每年的1月和4月。病情指数随种植密度的增加而升高,平均最高病情指数为67.47,平均最低病情指数为32.07;各种植密度间病情指数差异极显著。各肥力水平下病情指数差异达极显著水平,与D9(CK)相比,最好的处理为D8(N100-K200-P100)处理,病情指数为31.10。[结论]低密度有利于减少叶枯病的发生;氮肥过多会导致病害发生偏重,而增施磷肥和钾肥有利于提高植物的抗病能力,降低病害的严重度。

[Objective] Effects of planting density and fertility on garlic leaf blight were understood to provide reference for quality and high yield of garlic. [Method] Effects of planting density and fertility on garlic leaf blight were studied through field test in Wenjiang area. [Result] The epidemic dynamics of garlic leaf blight had two peaks,annually in January and April respectively. The disease index was positive correlation with planting density,along with the increase of planting density,the average highest disease index was 67. 47 and the average lowest disease index was 32. 07. The disease index of different fertility levels referred to significant difference,and compared with CK,the best treatment was D8（ N100-K200-P100）,and the disease index was 31. 10. [Conclusion] The density was helpful to reduce the severity of garlic leaf blight. Too much nitrogen fertilizer would lead to disease more serious,but increasing the application of phosphorus fertilizer and potassic fertilizer was beneficial to improve the disease resistance of plants and reduce the severity of the disease.