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玉米叶发紫色是什么原因
玉米叶发紫色可能是温度偏低导致的,应选在温暖时间播种,低温时覆盖薄膜保温。也可能是缺少磷元素导致的,可增施农家肥或磷肥,喷施含磷元素的叶面肥。还可能是感染紫红叶病导致的,应蚜虫预防,染病后可喷药处理。或可能是感染玉米螟导致的,可提前做好预防,用氰戊菊 ...
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