Zinc is mainly used as a metal activator of enzymes in plants. The earliest discovered zinc-containing metalloenzyme was carbonic anhydrase, which was widely distributed in plants and was found mainly in chloroplasts. It catalyzes the hydration of carbon dioxide and promotes the fixation of carbon dioxide in photosynthesis. Deficiency of zinc reduces the activity of carbonic anhydrase. Therefore, zinc is important for the formation of carbohydrates. Zinc is also involved in the synthesis of auxin (indole acetic acid) in plants. In the absence of zinc, the content of auxin in the plant is reduced, the growth and development appear stagnant, the stem segments are shortened, the plants are short, and the extension and elongation of the leaves are blocked. , forming leaflets, and clustered. A pale green, yellow or white rust appears between veins, especially on old leaves. In the field, it can be seen that the plants are uneven, the maturity period is delayed, and the fruits are poorly developed. Zinc-deficient plants in China have been reported to include "rice-seeded seedlings", "stuck-up seedlings", "sitting worms" of rice, "bladder blight" of corn, "lobule disease" of fruit trees such as citrus, and "bronze disease of tung tree". "Wait. The zinc content of crops is generally 20-100 mg/kg, and zinc deficiency may be less than 20 mg/kg. Different plants have different sensitivities to zinc deficiency. Some plants are particularly sensitive to zinc deficiency in soil and can be used as indicator plants in zinc-deficient areas. Among the fruit trees, citrus and peach are particularly good indicator plants. In field crops, corn and flax are particularly sensitive to zinc deficiency. The ragweed is a zinc accumulative, and its zinc content can be as high as 4000mg/kg, which is an indicator of natural zinc excess. According to the sensitivity of plants to zinc deficiency can be divided into three. Sensitivity of plants to zinc deficiency is not sensitive, moderately sensitive, highly sensitive barley, sorghum, corn, wheat, alfalfa, sweet corn, cherry oat, clover, rice, nectarine rye, potato, buckwheat, apple pea tomato, Soy beans, avocado carrots, sugar beets, cotton, pear mustard, edible beets, flax, plum mint, sudan grass, ramie, apricot, cocoa, tobacco, citrus, bamboo, onions, sunflowers, grapes, pasture, hops, Walnut, tung tree, pecan cabbage, mango, lettuce, pomegranate, celery, papaya, spinach, coffee. Protective Gown,Disposable Sms Gown,Surgical Isolation Gowns,Protective Gowns Disposable Taizhou huangyan Yiman industry & trade limited , https://www.yimancoverall.com