See also plate 32 manganese deficiency and plate 20 potassium deficiency 同样注意图32缺锰症和图20缺钾症。
2.
Leaf to right : same potassium supply with additional ( luxury ) iron supply ; symptoms of potassium deficiency delayed in older leaves and especially evident in later younger leaves finally becoming more severe with increased iron supply 从左到右：钾的供应伴随着铁的供应，缺钾症会延迟出现在老叶上，后期的幼叶尤其明显，最后随着铁供应的增多，缺钾症状更加严重。
