What kind of fertilizer is calcium magnesium phosphate? Detailed explanation of its characteristics and uses
What is calcium magnesium phosphate? What nutrients does calcium magnesium phosphate contain? We ask knowledgeable readers to help explain. Calcium magnesium phosphate is a relatively common fertilizer variety, but what exactly is calcium magnesium phosphate? Many farmers still do not understand it; therefore, Zhongdiwang has compiled information on calcium magnesium phosphate, listed in detail below for readers...
What is calcium magnesium phosphate? What nutrients does calcium magnesium phosphate contain? We ask knowledgeable readers to help explainCalcium magnesium phosphate is a relatively common fertilizer variety, but what exactly is calcium magnesium phosphate? Many farmers still do not understand it; therefore, Zhongdiwang has compiled information on calcium magnesium phosphate, listed in detail below for readers' reference.
What is calcium magnesium phosphate:
Calcium magnesium phosphate is made by melting phosphate rock and an appropriate amount of magnesium-containing silicon ore at high temperature, quenching in water to form glassy crushed particles, and then ball-milling them into fine powder. Therefore, it is also called fused magnesium phosphate fertilizer, or fused phosphate fertilizer for short, and is currently one of the main varieties of phosphate fertilizer in China. The main components of calcium magnesium phosphate are high-temperature-type tricalcium phosphate and calcium orthosilicate. Calcium magnesium phosphate not only provides low-concentration phosphorus, but also provides large amounts of silicon, calcium, and magnesium.
Components contained in calcium magnesium phosphate:
Generally, calcium magnesium phosphate contains 12%~20% available phosphorus, and also contains 25%~30% calcium oxide, 15%~18% iron oxide, 10%~15% magnesium oxide, and 25%~40% silicon dioxide. Calcium magnesium phosphate also contains small amounts of aluminum, manganese, and other salts.
Characteristics of calcium magnesium phosphate:
Calcium magnesium phosphate is insoluble in water but soluble in a 2% citric acid solution. It belongs to citrate-soluble phosphate fertilizer, is insoluble in water, is alkaline, its available phosphorus is not leached away, and it is non-corrosive, does not absorb moisture, and does not cake.
The phosphate contained in calcium magnesium phosphate must be dissolved before it can be absorbed and used by crops, and its solubility is greatly affected by soil pH. After calcium magnesium phosphate is applied to acidic soil, it helps the phosphate in the fertilizer gradually dissolve and release for crop absorption and use. At the same time, during the conversion process, calcium magnesium phosphate can also neutralize part of the soil acidity, thereby improving the availability of phosphorus in the soil and fertilizer. When calcium magnesium phosphate is applied to neutral and calcareous soil, under the acid action of soil microorganisms and crop root secretions, it can also gradually dissolve and release phosphoric acid, but the release rate of calcium magnesium phosphate is slower than in acidic soil, and the fertilizer effect is relatively longer.
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