缺氮:植株生长缓慢,全株呈淡绿色甚至黄绿色,继而老叶周围部分呈淡黄色,以至于干枯脱落。
缺磷:植株的叶片、叶柄和叶片边缘均向上坚起,叶片萎缩变少,叶色暗绿,植株矮小或细长,早期脱落,块茎内可能出现锈褐色的疮痕或斑点。
缺钾:植株生长减缓,节间变短,植株弯曲下垂,叶片卷缩、叶面缩小、叶脉下陷,叶尖及叶缘由绿色变为暗绿,有时叶面出现紫纹,植株基部几个叶片同时枯干,而心叶则仍呈正常状态。且植株很容易受寄生虫病菌的侵害,块茎内部呈灰色。
缺钙:幼叶变小,颜色淡绿,叶缘卷起,其后枯死。
缺镁:基部老叶的叶尖缘发生失绿现象,逐渐沿叶脉间扩展,最后叶脉间的组织填满褐色的死斑,向上卷起,叶脉间部分突出,厚而暗,病叶最后死亡脱落。
缺硼:顶尖枯死,侧芽迅速生长,节间缩短,从而使植株呈矮丛状;叶片增厚,叶缘上卷,叶中组织累积大量淀粉,长期缺硼时根部短粗呈褐色,根类死亡,块茎矮小,维管束变褐,表皮有裂痕。
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