How many kinds of calcium fertilizer do you have?

How many kinds of common calcium fertilizer are there? What are the characteristics of calcium fertilizer? What are the characteristics of common calcium fertilizer? The following farming help planting network is briefly introduced for netizens' reference. First, lime is the most important calcium fertilizer, including quicklime, cooked lime and carbonate lime. Lime is strongly alkaline, which can not only supplement crop calcium nutrition, but also regulate soil acidity and alkalinity, improve soil structure, promote soil beneficial microbial activity, and accelerate organic matter decomposition and nutrient release. Lime can reduce the fixation of phosphorus by iron and aluminum ions in soil and improve the availability of phosphorus. Lime can also kill germs and eggs in the soil as well as weeds. 1, quicklime: also known as burnt lime, the main component is calcium oxide, the chemical formula is CaO. It is usually fired with limestone and contains 90% calcium oxide 96% calcium oxide. If it is fired with dolomite, it is called magnesium lime, which contains not only 55% calcium oxide 85%, but also 10% magnesium oxide 40%, which also has the effect of magnesium fertilizer. Shellfish contains a lot of calcium carbonate, which is also the raw material for making lime. The shell ash in coastal areas is made from shellfish. The content of calcium oxide in spiral shell ash is 85%-95%, and that of clam shell ash is about 47%. Quicklime has a strong ability to neutralize soil acidity and can quickly correct soil acidity. In addition, it has insecticidal, herbicide and disinfection effects. 2, hydrated lime: also known as hydrated lime, the main component is calcium hydroxide, the chemical formula is Ca (OH) 2. It is made by absorbing moisture or adding water to quicklime, which gives off a lot of heat energy. The ability of hydrated lime to neutralize soil acidity is also very strong. Its content varies with the type of raw materials, which can be calculated according to the content of calcium oxide in quicklime. 3. Carbonate lime: the main component is calcium carbonate, and the chemical formula is CaCO3. Made from limestone, dolomite or shellfish. Its solubility is small, and its ability to neutralize soil acidity is mild and lasting. Second, there are three kinds of agricultural gypsum: raw gypsum, cooked gypsum and phosphogypsum. The solubility of calcium sulfate is very low, and the aqueous solution is neutral, which belongs to physiological acid fertilizer. It is mainly used in alkaline soil, eliminate soil alkalinity, improve soil and provide calcium and sulfur nutrition for crops. 1. Raw gypsum: ordinary gypsum, commonly known as white gypsum, is mainly composed of CaSO4 2H2O and contains about 23% calcium (Ca). It is directly crushed from gypsum ore, in the form of powder, slightly soluble in water, fine particles are conducive to dissolution, sulfur supply capacity and soil improvement effect is also high, usually 60 mesh sieve hole is suitable. In addition to calcium, it also contains 18.6% sulfur (S). 2. Cooked gypsum: also known as alabaster, its main component is CaSO4 ·1 / 2H2O, which contains about 25.8% calcium (Ca). It is formed by heating and dehydration of raw gypsum. Strong hygroscopicity, after water absorption into raw gypsum, physical properties become worse, inconvenient to apply, it is appropriate to store in a dry place. In addition to calcium, it also contains 20.7% sulfur (S). 3. Phosphogypsum: the main component is CaSO4 2H2O, accounting for about 64%, of which calcium (Ca) is about 14.9%. Phosphogypsum is the residue after sulfuric acid decomposes phosphate rock to produce phosphoric acid, and it is a by-product of ammonium phosphate production. Its composition varies from place of origin, generally containing sulfur (S) 11.9% and phosphorus pentoxide about 2%. Third, other calcium-containing fertilizers, in addition to the above-mentioned lime fertilizers, calcium nitrate and calcium chloride are soluble in water and are often used as topdressing fertilizers outside the roots, and they and calcium sulfate (gypsum) and calcium hydrogen phosphate are also often used as calcium sources of nutrient solution. In addition, a variety of phosphate fertilizers (such as calcium superphosphate, phosphate rock powder, precipitated calcium phosphate, calcium magnesium phosphate fertilizer, steel slag phosphate fertilizer, etc.) are also important sources of calcium fertilizer. Calcium nitrate, calcium chloride and calcium hydroxide can be used for foliar spraying, and the concentration varies with fertilizers and crops. The concentration of calcium nitrate sprayed on fruit trees and vegetables is 0.5% 0.1%. Calcium chloride is generally 0.3% 0.5% (sometimes 0.7% for Chinese cabbage). Above is the planting help planting network to introduce the common varieties and characteristics of calcium fertilizer. If you have a better supplement, please leave a message below and let us know.