Younger leaves faded green and lusterless; older leaves marginal scorch, interveinal blotchy chlorosis, necrotic patches bleaching and withering; characteristic of some soil acidity conditions.

• 甜菜锰和铝合并中毒：幼叶褪绿失去光泽，老叶边缘枯黄，脉间有坏死褐色斑点，接着白化，枯萎。这是酸性土壤特有的。