This is a symptom of nitrogen deficiency. Nitrogen deficiency is common in plants that need nitrogen fertilizer: plants are light green, basal leaves turn yellow, brown when dry, short and thin stems, few branches and premature aging. When fruit trees lack nitrogen, there will be small fruits, few fruits and hard skins. Potassium deficiency: the stem is prone to lodging, the leaf edge is yellow, scorched and broken, necrotic spots appear between the veins, and the whole leaf is sometimes cup-shaped curled or shriveled, with brown roots. Boron deficiency: it is manifested by the phenomenon that the top stops growing, the young leaves deform and shrink, and the veins between leaves turn green irregularly. For example, the "flower without fruit" of rape, the "bud without flower" of cotton, the fruit shrinkage of apple and the heart rot of radish are all caused by boron deficiency. Zinc deficiency: characterized by small leaf clusters, spots on both sides of leaves, short plants, shortened internodes and delayed growth period. For example, lobular disease of fruit trees and gray seedlings of corn are all caused by zinc deficiency. Phosphorus deficiency: the plants are dark green, often green or purple, dark green when dry, the stems are thin and short, the basal leaves turn yellow, the flowering period is delayed, and the seeds are small but not full. Iron deficiency: the veins lose their green color and present a clear network. In severe cases, the whole leaves (especially young leaves) are pale yellow or even white. Manganese deficiency: small necrotic spots appear between veins, and dark green stripes and ribs appear in veins. Magnesium deficiency: the leaves turn yellow, although the veins are still green, but the veins turn yellow, sometimes purple, and necrotic spots appear.

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