What is the function of ferrous sulfate?

What is the function of ferrous sulfate? How to use ferrous sulfate? Also ask experienced netizens to help introduce the sky blue or green ferrous sulfate powder or crystal that is often seen in the agricultural market, but there are still many netizens who do not quite understand the function and usage of ferrous sulfate. Therefore, the farming network has sorted out the function and usage of ferrous sulfate, which is listed in detail below for netizens' reference. The role of ferrous sulfate: general ferrous sulfate contains 19% iron and 11.5% sulfur, which is a good iron fertilizer. Frequent use of acidophilic plants can prevent the occurrence of chlorosis. Because iron is necessary for the formation of plant chlorophyll, when iron deficiency, the formation of chlorophyll is blocked so that the plant chlorosis, leaves become yellowish. The aqueous solution of ferrous sulfate can directly provide iron that can be absorbed and utilized by plants and can reduce the alkalinity of the soil. At the same time, ferrous sulfate can also be used as a pesticide to control wheat smut, scab of apples and pears, fruit tree rot, and fertilizer to remove moss and lichens from tree trunks. The usage of ferrous sulfate: first, fruit trees can be sprayed with 0.2%-0.1% ferrous sulfate solution after leaf bud germination, spraying every 10 days or so for 2 or 3 times until the fruit tree leaves turn green, but the effect of spraying fruit tree leaves after aging is relatively poor. Second, iron deficiency in gramineous crops (such as rice, wheat, sorghum) can be sprayed with 3%-4% ferrous sulfate. Generally, the symptoms of chlorosis can be sprayed once at the seedling stage. If severe chlorosis is serious, it can be sprayed 2-3 times in a row, each time at an interval of 10-15 days. Ferrous sulfate solution should be used now, and a small amount of wetting agent can be added during spraying to increase the adhesion of the solution on the leaf surface and improve the spraying effect. Third, for iron deficiency in vegetables, 0.2%-0.5% ferrous sulfate can be sprayed, and appropriate amount of water should be sprayed during spraying to avoid leaf burning. The concentration of ferrous sulfate exceeding 0.5% is prone to drug damage. 4. Ferrous sulfate injection method: 0.3%-1% ferrous sulfate solution can be quickly injected into the tree trunk with a syringe, and then the infusion bottle can be hung on the tree to allow the tree to absorb slowly. This method is effective quickly and can be effective if it can not be wiped off in 3 days. Fifth, ferrous sulfate-based method: each adult tree is sprayed with 2-2.5 kg ferrous sulfate in 50-100 kg organic fertilizer, after fully mixing, dig 8-10 small holes along the periphery of the crown, apply organic fertilizer mixed with ferrous sulfate, and then cover the soil; such as wheat can be directly applied to the soil, the application amount is 30 kg per mu. The application of ferrous sulfate by basic application method can effectively supplement the content of iron in soil, control diseases and insect pests, loosen soil, prevent soil consolidation, and promote the development of crop root system, and the mixed application of ferrous sulfate and organic fertilizer can reduce the fixation of soil to iron and improve fertilizer efficiency. Matters needing attention in the application of ferrous sulfate: 1. Ferrous sulfate can be mixed with intermediate and acidic pesticides, and 0.1% neutral washing powder can be added during spraying, which can improve the effect. 2. Do not directly spray ferrous sulfate in fruit stage and vegetable seedling stage. 3. When spraying ferrous sulfate, we should avoid the hot sun and high temperature, and it is suitable to spray in the early morning or after 4 o'clock in the afternoon. What is the function of boron fertilizer? What is calcium magnesium phosphate fertilizer?