Ferrous sulfate fertilizer refers to ferrous sulfate heptahydrate. Blue green monoclinic crystals or particles. No odor. Weathering in dry air. Oxidation of the surface to brown basic ferric sulfate in humid air. It becomes a tetrahydrate at 56.6 ºC and a monohydrate at 65 ºC. Soluble in water, almost insoluble in ethanol. Its aqueous solution slowly oxidizes in air when cold and rapidly oxidizes when hot. Adding alkali or exposure to light can accelerate its oxidation. Relative density (d15) 1.897. Half lethal dose (mouse, oral) 1520mG/kG. It is stimulating. Anhydrous ferrous sulfate is a white powder, and the crystal containing crystal water is a light green crystal, commonly known as "green alum". It dissolves in aqueous solutions and appears light green.
purpose
Used for chromatographic analysis reagents. Drip analysis is used to determine platinum, selenium, nitrite, and nitrate. Reducing agent. Manufacturing ferrites, water purification, and polymerization catalysts. It can be used as a pesticide in agriculture to prevent and control wheat smut, apple and pear scab, and fruit tree rot; Edible grade is used as a nutritional supplement, such as iron fortifier and fruit and vegetable coloring agent. It can also be used as fertilizer to remove moss and lichen from tree trunks. It is a raw material for manufacturing magnetic iron oxide, iron oxide red and iron blue inorganic pigments, iron catalysts, and polyferric sulfate.
The function of ferrous sulfate fertilizer:
1. With the application of ferrous sulfate fertilizer, plants can not only supplement iron elements in their bodies, but also promote their absorption of nitrogen and phosphorus elements. Because ferrous sulfate has strong reducibility, it can greatly regulate the redox process in plants and promote the absorption of various elements. The function of ferrous sulfate fertilizer
2. The application of ferrous sulfate based fertilizer and seed fertilizer can accelerate the decomposition of organic matter in the soil and prevent the problem of iron deficiency malnutrition in plants, such as the occurrence of yellow leaf disease in many flowers due to iron deficiency. The effect is better when used in conjunction with organic fertilizer.
3. A solution of ferrous sulfate is prepared and applied to the leaves (usually mixed with lime), which can also prevent many flies and insects from attacking flowers or crops and causing diseases such as rice fever, chlorosis, premature leaf wilting, cotton anthracnose, corner spot disease, plant death, etc.
4. A compound fertilizer made from 10% ammonium sulfate, 40% ferrous sulfate, and 50% plant ash can prevent harm to many crops while increasing yields significantly. Corn and rice can increase yields by 14.9% to 37.1%. In addition, soaking barley and wheat seeds in ferrous sulfate solution can prevent various harms such as black ear disease and stripe disease.
5. Due to the acidic nature of ferrous sulfate, it has the effect of improving soil acid balance, converting divalent iron in highly alkaline soil into trivalent iron that exists in the soil for a long time, reducing its alkalinity, especially for calcareous soil.
Ferrous sulfate is widely used as an iron fertilizer, but it also has some limitations. For example, if the soil itself is acidic and plants lack iron and need to apply ferrous sulfate fertilizer, an alkaline agent (such as lime) needs to be added during the application process to avoid causing the soil to become too acidic and affecting the plant growth environment. Secondly, it should not be applied together with elements such as calcium, magnesium, manganese, and copper that have an antagonistic effect on iron, as this can weaken or even render iron fertilizer ineffective.
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