在农业生产中，草木灰是一种常用的底肥．根据你所学知识，草木灰的主要作用是（）A．促进细胞分裂分化，使枝叶茂盛B．促进幼苗的生长发育，花的开放，果实和种子成熟C．促进糖类的-生物

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• 农作物栽培过程中，需要施用量最多的无机盐是（）A．含氮磷钾的B．含锰钼铜的C．含氮磷钙的D．含铁锌钙的-生物
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• 菜农描述了承包田里油菜生长的情况，请你查阅资料，帮他找出解决方法．（1）苗期植株生长特别缓慢，且叶片出现紫色，最好施加哪种无机盐肥料？（2）春天返青后，发现叶片发黄，应施-生物
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