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植株的生长发育所需的营养物质：水、无机盐和有机物

> 不同作物缺少不同无机盐，表现不同的症状：大白菜矮小瘦弱，叶色发黄；油菜只开花，不结果；向日葵杆细茎弱，易倒伏；玉米苗长得特别矮小，叶暗绿色．叶片出现紫红色．上述作物分别缺少的元机盐是（　　） ①硼②钾③磷④氮． A．①②③④ B．②①③④ C．③④①② D．④①②③

问题：

发布时间：2024-09-12

不同作物缺少不同无机盐，表现不同的症状：大白菜矮小瘦弱，叶色发黄；油菜只开花，不结果；向日葵杆细茎弱，易倒伏；玉米苗长得特别矮小，叶暗绿色．叶片出现紫红色．上述作物分别缺少的元机盐是（　　）
①硼②钾③磷④氮．

A．①②③④ B．②①③④ C．③④①② D．④①②③

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