Application characteristics and matters needing attention of calcium magnesium phosphate fertilizer

Calcium magnesium phosphate is insoluble in water, non-toxic, non-corrosive, non-hygroscopic, non-caking, chemical alkaline fertilizer. It is widely applicable to all kinds of crops and acid soil lacking phosphorus, especially to acid red soil with serious calcium and magnesium leaching in South China.

application characteristics

1. It is most suitable for deep application of basal fertilizer. After calcium magnesium phosphate fertilizer is applied to the soil, phosphorus can only be dissolved by weak acid, and can only be utilized by crops after a certain transformation process, so the fertilizer efficiency is slow and belongs to slow effect fertilizer. Generally combined with deep ploughing, the fertilizer is evenly applied to the soil, so that it is mixed with the soil layer to facilitate the dissolution of soil acid and to facilitate the absorption of crops.

2. Paddy fields in the south can be used to dip seedling roots. The dosage per mu is about 10 kg, which has no harm to seedlings and has a good effect.

3. Mix with more than 10 times of high-quality organic fertilizer for more than 1 month. The retting fertilizer can be used as base fertilizer, seed fertilizer, or used to dip seedlings.

precautions

1. The effect of calcium, magnesium and phosphorus fertilizer combined with calcium and nitrogen fertilizer is better, but it cannot be mixed with them.

2, calcium magnesium phosphate fertilizer usually can not be mixed with acid fertilizer application, otherwise it will reduce the effect of fertilizer.

3, calcium magnesium phosphate dosage should be appropriate, generally the dosage per mu should be controlled between 15~25 kg. Excessive application of calcium, magnesium and phosphorus fertilizer will not only increase the fertilizer efficiency but also reduce the return. Usually 35~40 kg of calcium, magnesium and phosphate fertilizer can be applied every other year.

4. Calcium magnesium phosphate fertilizer is most suitable for crops with strong ability to absorb soluble phosphorus, such as rape, radish, leguminous green manure, leguminous crops and melons.