How to use calcium magnesium phosphate fertilizer?

How to use calcium magnesium phosphate fertilizer? Please introduce the main producing area of calcium magnesium phosphate fertilizer in China. Because of its wide source of raw materials and simple production process, it has developed rapidly in phosphate rock producing areas in southern China in recent years. The appearance of this kind of fertilizer is gray-white, black-green or brown glassy powder, which contains complex ingredients, mainly Ca3 (PO4) 2, as well as P2O5, CaO, MgO, SiO2, CaMg and so on. Due to different producing areas, product specifications vary greatly. Generally, the P2O5 content is between 14% and 20%, the CaO content is between 25% and 30%, the MgO content is between 10% and 15%, and the SiO2 content is between 25% and 40%. It can be seen that calcium magnesium phosphate fertilizer is a kind of multicomponent fertilizer which mainly contains phosphorus and contains calcium, magnesium, silicon and other components at the same time. Calcium magnesium phosphate fertilizer is insoluble in water, non-toxic, non-corrosive, non-hygroscopic, non-caking, chemical alkaline fertilizer. It is widely used in all kinds of crops and phosphorus-deficient acid soil, especially in the acid red soil with serious calcium and magnesium leaching in the south. The specific characteristics are as follows: (1) it is most suitable for deep application of base fertilizer. After calcium magnesium phosphate fertilizer is applied to the soil, phosphorus can only be dissolved by weak acid and can only be used by crops after a certain transformation process, so the fertilizer effect is slow, so it belongs to slow-acting fertilizer. In general, combined with deep ploughing, fertilizer is evenly applied to the soil and mixed with the soil layer, so as to facilitate the dissolution of soil acid and its absorption by crops. (2) Paddy fields in the south can be used to touch the roots of seedlings. The dosage per mu is about 10 kg, there is no harm to the seedlings, and the effect is better. (3) mixed with more than 10 times high-quality organic fertilizer for more than one month, the compost can be used as base fertilizer, seed fertilizer, and can also be used to touch seedling roots. In the use of calcium magnesium phosphate fertilizer, we should pay attention to the following aspects: (1) the effect of combined application of calcium magnesium phosphate fertilizer, common calcium fertilizer and nitrogen fertilizer is better, but it can not be mixed with them. (2) calcium magnesium phosphate fertilizer can not be mixed with acid fertilizer, otherwise it will reduce the effect of fertilizer. (3) the amount of calcium magnesium phosphate fertilizer should be appropriate, and the amount of calcium magnesium phosphate fertilizer should be controlled between 15kg and 25kg per mu. Excessive application of calcium magnesium phosphate fertilizer will not only not increase the fertilizer efficiency, but also lead to the problem of diminishing returns. Usually, when applying calcium magnesium phosphate fertilizer 35kg to 40kg per mu, it can be applied every other year. (4) calcium magnesium phosphate fertilizer is most suitable for crops with strong ability to absorb citrus soluble phosphorus, such as rape, radish, legume green manure, legume crops and melons. Click to get more nitrogen, phosphorus, potassium application techniques click to get more chemical fertilizer application techniques