At present, what we usually refer to as medium-element element fertilizers are calcium, magnesium, and sulfur fertilizers. These elements are stored in large amounts in the soil. At the same time, they can be supplemented when certain large amounts of elemental fertilizers (nitrogen, phosphorus, and potassium fertilizers) are applied. The situation can meet the needs of crops. However, some crops are in great demand. In the case of insufficient soil supply, external supplies are needed. Commonly used varieties:
1. Commonly used varieties of calcium fertilizer are lime, gypsum, calcium phosphate, calcium superphosphate, calcium magnesium phosphate fertilizer and other calcium-containing substances;
2. Magnesium fertilizer has calcium magnesium phosphate fertilizer, magnesium sulfate, magnesium oxide, dolomite powder;
3. The main varieties of sulfur fertilizer are calcium phosphate, ammonium sulfate, magnesium sulfate and potassium sulfate.
Therefore, some fertilizers contain a variety of elements required by the crop, and the application of a fertilizer can simultaneously meet the demand for various elements of the crop.
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