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Rock phosphate is a naturally occurring mineral used primarily as a source of phosphorus in agriculture. It is mined from deposits of sedimentary rocks and consists mainly of calcium phosphate along with various impurities. This mineral is crucial for plant growth, as phosphorus is one of the three primary nutrients required by plants, alongside nitrogen and potassium.
| Chemical composition | Calcium phosphate (Ca3(PO4)2) with varying impurities |
| Phosphorus content | Typically 25% to 30% P2O5 |
| Granule size | Usually ranges from 0.1 mm to 5 mm |
| Solubility | Low solubility in water, higher solubility in acidic soils |
| Form | Available in powder or granulated form |
When selecting rock phosphate, buyers should consider the phosphorus content and the specific needs of their crops. It is important to specify the desired granule size and whether a powder or granulated form is preferred. Additionally, understanding the soil's pH and nutrient profile can help determine the appropriate application rates. Buyers may also inquire about the source and any certifications related to the mining and processing of the phosphate.
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It is primarily used as a phosphorus source in fertilizers for crops.
It can be applied directly to the soil or mixed with other fertilizers.
Yes, it is often used in organic farming as a natural source of phosphorus.
It improves soil fertility and promotes healthy plant growth.
It is most effective in acidic soils where its solubility increases.
It is a natural mineral with lower solubility compared to processed fertilizers.