缺铁主要症状为“失绿病”。开始叶脉失绿黄化，以后完全失绿。因铁在体内不易移动，新叶失绿，而老叶仍为绿色。果树新梢叶片变白，形成“梢枯”现象。缺锰症状从新叶开始，双子叶植物新叶的叶肉缺绿变黄，叶脉仍绿色；单子叶植物出现灰色或褐色斑点，严重时叶色失绿而坏... The main symptom of iron deficiency is “chlorosis”. Veins lost chlorosis, completely lost the green after. Due to the iron in the body is not easy to move, the new leaves lost their green, while the old leaves are still green. Fruit shoots new leaves white, forming a “shoot dry” phenomenon. Manganese deficiency symptoms starting from a new leaf, dicotyledonous new leaf leaves lack of green yellow, veins are still green; Monocots appear gray or brown spots, severe leaf color green and bad ...