The first step is to see where the symptoms appear: if the symptoms first appear on the old leaves, it means that the lack of nitrogen, phosphorus, potassium, magnesium, zinc; if the symptoms first appear on the new tissue, it means that the lack of calcium, iron, Boron, sulfur, manganese, molybdenum, copper.
The second step is to see if the symptoms of the old leaves have lesions, and whether the symptoms of the new leaves are topped out: in the case of symptoms of the old leaves, there is no lesion, and may be deficient in nitrogen or phosphorus; if the lesions may be deficient in potassium or Zinc and magnesium. Symptoms start from the new leaves, if the top buds die, it may be calcium or boron deficiency;
If the top bud is not easy to die, it may be iron, sulfur, manganese, molybdenum and copper.
The third step is to determine the lack of elements according to the specific symptoms: yellow deficiency, yellow leaves, scorch, fresh green leaves, early maturity; and phosphorus deficiency, dark green leaves or stems and leaves are purple-red, delayed maturity; Potassium spots appear first on the tip and edge of the old leaves, and the pathological condition is aggravated with the growth and development process, leading to premature aging. The zinc-deficient leaves are narrow, the spots appear in the middle and lower parts and the whole leaves, the apical vertebral veins are chlorotic, and the growth period is prolonged; the magnesium deficiency and old veins are chlorotic, and there are reticular veins, but it is generally difficult to organize necrosis. Boron stems and stems become thicker, brittle, easy to crack, less or less fruity, and prolonged growth period; when calcium deficiency, the leaves are bent and hooked and adhere to each other. The new iron deficiency leaves are yellow, and the veins are chlorotic. In severe cases, the whole leaves are yellowish or white; the new leaves with sulfur deficiency are relatively light green, and the growth period is prolonged; the new leaves are deficient in molybdenum, and spots are scattered on the leaves; The young leaves lacking copper wilted, white plaques appeared on the leaves; the chlorosis between the manganese-deficient veins was fine, and the tissues were easy to be necrotic. There is also an elemental chlorine, which is mainly obtained from air or water, so it is not easy to lack, but when it is lacking, it will cause crop roots to be short and less lateral roots.
There are also various crops that respond differently to different trace elements, with different degrees of sensitivity and different requirements. Therefore, trace elements should be applied to crops that require more (ie, sensitivity). For bees, rapeseed, kale, cauliflower, radish, apples, etc., which require more boron, corn, rice, tomatoes, grapes, etc., which require more zinc, have legumes, cruciferous crops, and manganese. There are many potatoes, sweet potatoes, spinach, etc., there are many copper, wheat, onions, lettuce, etc., iron deficiency occurs in fruit trees, such as apples, peach trees, citrus and so on. In short, after understanding the above methods, it is necessary to make judgments based on other situations and rationally apply fertilizers.
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