论文部分内容阅读
Effects of different forms of nitrogen application on nodule growth and nitrogen fixation in soybean
【机 构】
:
Northeast Institute of Geography and Agricultural Ecology,Chinese Academy of Sciences,150081,Harbin,
【出 处】
:
第八届世界大豆研究大会暨第九届全国大豆学术讨论会
【发表日期】
:
2009年12期
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燕麦叶斑病,是由燕麦内脐孺孢菌(Drechslera avenacea)(有性态为Pyrenophora avenae)侵染所致。是燕麦生产中常见的病害。在2009-2011年对内蒙古、山西、河北主要的燕麦种植区调查发现,该病发生普遍。病原菌主要为害燕麦的叶片和叶鞘,叶片上的病斑椭圆形或长椭圆形,中央灰白,边缘紫褐色。严重时病斑融合成片,从叶尖向下而导致叶片枯死,引起产量减少。
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