The main origin of calcium magnesium phosphate fertilizer in China. Due to its wide source of raw materials and simple production process, phosphate minerals have developed rapidly in the south of China in recent years. The appearance of the fertilizer is gray, black green or brown glassy fines. Due to different origins, there is a big difference in product specifications. Generally, the content of phosphorus (P2O5) is between 14% and 20%, and the content of calcium oxide (CaO) is between 25% and 40%. It can be seen that calcium magnesium phosphate fertilizer is a kind of multi-element fertilizer mainly composed of phosphorus and containing calcium, magnesium and silicon.
Calcium magnesium phosphate fertilizer is insoluble in water, non-toxic, non-corrosive, not easy to absorb moisture, difficult to agglomerate, chemical alkaline fertilizer. It is widely applied to all kinds of crops and phosphorus-deficient acidic soils, and it is especially suitable for acid red soils with severe calcium and magnesium leaching in the south. The specific use is as follows:
(1) It is most suitable for deep basal application. After the calcium, magnesium, and phosphate fertilizers are applied to the soil, phosphorus can only be dissolved by weak acids, and after a certain conversion process, it can be used by crops, so the fertilizer effect is slow and it is a slow-acting fertilizer. In general, in combination with deep plowing, the fertilizer is uniformly applied to the soil so that it is mixed with the soil to facilitate dissolution and absorption of the crop.
(2) Southern paddy fields can be used to root roots. The dosage per acre is about 10kg. There is no harm to the seedlings and the effect is better.
(3) Mixing more than 10 times of high-quality organic fertilizer and mixing for more than one month, the retort fertilizer can be used as base fertilizer, seed fertilizer, and can also be used for rooting.
Matters needing attention in the application of calcium, magnesium and phosphate fertilizers:
(1) Calcium, magnesium, phosphate fertilizers and general calcium and nitrogen fertilizers have better effects, but cannot be mixed with them.
(2) Calcium, magnesium and phosphate fertilizers can not be mixed with acidic fertilizers, otherwise it will reduce the effect of fertilizers.
(3) The amount of calcium magnesium phosphate fertilizer should be appropriate, generally the amount per mu should be controlled between 15 ~ 20kg. Usually, when Mg, Mg, and P fertilizers are applied in 35 to 40kg per mu, they can be applied every other year.
(4) Calcium-magnesium-phosphate fertilizer is most suitable for crops with strong absorptive phosphorus-absorbing ability, such as rape, radish, legume green manure, leguminous crops and melons. In the absence of silicon in rice fields, calcium, magnesium and phosphate fertilizers are also effective.
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