Calcium magnesium phosphate fertilizer is primarily produced in southern China, where the availability of raw materials and a straightforward production process have led to its rapid development in recent years. This type of fertilizer typically appears as a gray, black-green, or brown glassy fine powder, containing complex components such as Ca₃(PO₄)₂, P₂O₅, CaO, MgO, SiO₂, and CaMg. The composition can vary depending on the source of the material, resulting in differences in product specifications.
Generally, the Pâ‚‚Oâ‚… content ranges from 14% to 20%, CaO from 25% to 30%, MgO from 10% to 15%, and SiOâ‚‚ from 25% to 40%. As a result, calcium magnesium phosphate fertilizer is considered a multi-nutrient fertilizer that provides phosphorus, calcium, magnesium, silicon, and other essential elements. It is insoluble in water, non-toxic, non-corrosive, and does not absorb moisture or clump, making it a chemical alkaline fertilizer. It is suitable for all types of crops and particularly effective on phosphorus-deficient acidic soils, especially in southern regions with acidic red loam where calcium and magnesium are more prone to leaching.
Its application features include:
1. **Deep basal application**: Since the phosphorus in this fertilizer is only soluble in weak acids, it requires a conversion process before being available to plants. Therefore, it acts as a slow-release fertilizer. For best results, it should be applied deeply during plowing and mixed evenly into the soil layer, allowing it to interact with soil acids and improve nutrient absorption by crops.
2. **Root dipping in paddy fields**: In southern rice paddies, applying about 10 kg per mu (approximately 667 square meters) to the roots is safe for seedlings and improves growth effectiveness.
3. **Mixing with organic fertilizer**: When combined with high-quality organic fertilizer in a ratio of more than 10 times and left for over a month, it can serve as a base fertilizer, seed fertilizer, or root treatment.
When using calcium magnesium phosphate fertilizer, certain precautions should be taken:
1. **Avoid mixing with general nitrogen fertilizers**: Although it works well with calcium-based nitrogen fertilizers, it should not be mixed directly with them.
2. **Do not combine with acidic fertilizers**: Mixing it with acidic fertilizers may reduce its effectiveness.
3. **Use appropriate amounts**: Typically, the amount should be controlled between 15 to 25 kg per mu. Excessive use can lead to diminishing returns. A recommended application rate is 35 to 40 kg every other year.
4. **Best suited for specific crops**: This fertilizer is most beneficial for crops with strong phosphorus uptake capabilities, such as rapeseed, radishes, leguminous green manure, legumes, and melons.
By following these guidelines, farmers can maximize the benefits of calcium magnesium phosphate fertilizer while ensuring sustainable and efficient crop growth.
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Probiotics' structure, such as peptidoglycan, lipoteichoic acid, and other components, can act as antigens to directly activate the immune system, or stimulate the host immune system through autocrine immune activators, thereby improving the immunity of animals, enhancing the activity of the body's innate immune cells and natural killer cells, activating dendritic cells, and stimulating the body to produce cytokines. And stimulate B cells to secrete antibodies, probiotics can stimulate the gut to produce secretory globulin A (SIgA), and protect body health.
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