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作物缺氮一般是（）开始变黄。
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作物缺氮一般是（）开始变黄。
A、A、上部叶片；
B、B、中部叶片；
C、C、下部叶片；
D、D、茎上叶片。
时间：2021-12-25 23:17
关键词：
农学
林学
答案解析
C
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作物缺氮一般是（）开始变黄。
作物缺氮有什么症状？
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