内蒙古燕麦叶斑病的发生及其影响因素

为探究内蒙古田间影响燕麦叶斑病的因素，采用正交试验设计对燕麦品种、播期、种植密度、施氮量、施磷量和灌水量6个因素及其组合于2009—2011年进行连续3年的重复试验，运用逐步回归法对3年试验数据进行分析，探讨不同因素及其组合对燕麦叶斑病的影响。正交方差和分析表明，播期和品种是影响燕麦叶斑病的主要因素，方差贡献率分别为78.69%和12.20%；而施氮量、施磷量和灌水量对燕麦叶斑病发生程度均无显著影响。拟合分析获得燕麦叶斑病发生程度与播期(x₂)、品种(x₁)和种植密度(x₃)之间的非线性回归方程为y=51.99-6.45x2-0.39x₁x₃，表明适当推迟播期、选择抗性较高的燕麦品种且相对密植可减轻燕麦叶斑病的发生程度。

Factors affecting occurrence of oat leaf spot in Inner Mongolia

To identify the agricultural factors affecting oat leaf spot in the field in Inner Mongolia, effects of six elements(varieties, sowing date, planting density, nitrogen amount, phosphorus amount and irrigation amount) were analyzed using an orthogonal experimental design in three successive years from 2009 to 2011. The orthogonal ANOVA showed that planting date and variety were the main influencing factors on oat leaf spot disease, accounting for 78.69% and 12.20% of total variance. Nitrogen,phosphorus, and irrigation amounts showed negligible impact on the severity of oat leaf spot disease.The fitting analysis results showed that varieties, sowing date, and planting density significantly affected the disease severity, which fit the nonlinear regression equation y=51.99-6.45x₂-0.39x₁x₃. Therefore,present study indicated that the severity of oat leaf spot disease could be controlled by planting resistant varieties with high density, as well as delaying the sowing date.