1、A comparison of calcium
Fused calcium magnesium phosphate and superphosphate were compared as fertilizers for subterranean clover growing on four phosphorus deficient soils in a pot culture experiment.
2、superphosphate_百度百科
Superphosphate（过磷酸钙/过磷酸盐）是英语名词，指由磷酸二氢钙、硫酸钙及其他磷酸盐组成的混合物，主要作为补充土壤磷元素的化肥使用。
3、Coupling phosphate type and placement promotes maize growth and
On calcareous soil, the effect of calcium magnesium phosphate fertilizer on maize yield increase was significantly better than that of superphosphate and diammonium phosphate (Hongbin et al., 2014).
4、Differences Between Superphosphate and Other Phosphate Fertilizers
This article explores the key differences between superphosphate and other types of phosphate fertilizers. It highlights the chemical composition, nutrient availability, and efficiency of superphosphate compared to alternatives.
Phosphorus fertilizer sources: What are the differences and which one
One interesting fact is that, even with calcium present versus ammonium, triple superphosphate can produce a solution pH ranging from 1 to 3, which is lower than the solution pH of MAP (4 to 4.5).
A comparison of calcium
Fused calcium magnesium phosphate and superphosphate were compared as fertilizers for subterranean clover growing on four phosphorus deficient soils in a pot culture experiment.
Superphosphates
Single superphosphate is a principal phosphate fertilizer. It also supplies two secondary elements, namely sulphur and calcium as it contains 21 % calcium. Monocalcium phosphate of single superphosphate dissolves in soil moisture and in that form the roots absorb phosphoric acid.
钙镁磷肥（矿物质元素）_百度百科
钙镁磷肥（外文名：fused calcium-magnesium phosphate fertilizer），是以磷矿与硅酸镁矿物为原料，经1350~1500℃高温熔融后水淬骤冷、干燥磨细制成的硅铝酸盐玻璃体，主要成分包括Ca3 (PO4)2、CaSiO3及MgSiO3，含有效磷（P2O5）12%-18%及钙、镁、硅等元素，水溶液呈碱性，适用于改良酸性土壤，可作基肥促进植物缓慢吸收养分。 该肥料采用高炉、电炉或平炉熔融法生产，占中国磷肥总产量的17%，2021年列入《实行铁路优惠运价的农用化肥品种目录》享受运价优惠。 2020年建成首条年产20万吨砂性肥料造粒生产线，突破砂性肥料造粒关键技术并实现颗粒钙镁磷肥的产业化生产。
Superphosphate
Almost all superphosphate produced today is triple superphosphate. The available phosphorus from superphosphates comes from monobasic calcium phosphate [Ca (H2 PO 4) 2], which is sufficiently soluble to nourish crops.
Effects of calcium magnesium phosphate fertilizer, biochar and spent
Calcium magnesium phosphate fertilizer is an alkaline bismuth soluble phosphate fertilizer, which has a mild fertilizer effect, high phosphorus utilization rate and low price, can be used as a soil conditioner.
Superphosphate and calcium-magnesium phosphate fertilizer are two common types of phosphate fertilizers, but they differ significantly in composition, usage, and application methods. Below is a detailed comparison of these two phosphate fertilizers:
1. Composition Differences
Superphosphate (Chemical Formula: Ca(H₂PO₄)₂)
- Main Components: Contains a higher proportion of calcium oxide (typically over 50%), with lower levels of calcium dihydrogen phosphate.
- Other Elements: May include trace amounts of silicates, aluminates, and other microelements.
Calcium-Magnesium Phosphate Fertilizer (Chemical Formula: CaMg(PO₄)₂)
- Main Components: Contains significant amounts of both calcium oxide (30%-70%) and magnesium oxide (10%-60%).
- Other Elements: May include trace amounts of silicates, aluminates, and other microelements.
2. Usage Differences
Superphosphate
- Primary Use: Mainly used in the production of phosphate fertilizers, such as monoammonium phosphate (MAP) and diammonium phosphate (DAP).
- Secondary Use: Can also be used for soil amendment to increase phosphorus content.
Calcium-Magnesium Phosphate Fertilizer
- Primary Use: Primarily used to produce calcium-magnesium phosphate fertilizers, such as calcium-magnesium phosphate fertilizer and calcium-magnesium-potassium phosphate fertilizer.
- Secondary Use: Can also be utilized to manufacture phosphogypsum, a raw material for cement production.
3. Application Method Differences
Superphosphate
- Application: Typically mixed with nitrogen fertilizers and applied as base fertilizer or topdressing.
- Precautions: Avoid mixing with sulfur-containing fertilizers to prevent chemical reactions that cause calcium sulfate precipitation.
Calcium-Magnesium Phosphate Fertilizer
- Application: Can be applied alone or mixed with other phosphate fertilizers.
- Precautions: The dosage and timing should be adjusted based on crop requirements and soil conditions.
4. Economic Differences
Superphosphate
- Cost-Effectiveness: Lower production costs due to its primary component being calcium oxide.
- Market Demand: Stable demand due to its role in producing phosphate fertilizers.
Calcium-Magnesium Phosphate Fertilizer
- Cost-Effectiveness: Higher production costs due to its dual components (calcium and magnesium oxides).
- Market Demand: Comparatively smaller demand, mainly limited to specific fertilizer production.
5. Environmental Impact Differences
Superphosphate
- Environmental Risks: Excessive use may lead to soil acidification, affecting soil structure and microbial activity.
- Mitigation: Neutralize soil acidity through chemical reactions or reduce environmental impact by enhancing plant absorption.
Calcium-Magnesium Phosphate Fertilizer
- Environmental Risks: Overapplication may cause soil salinization, harming crop growth.
- Mitigation: Control salt levels by adjusting dosage and timing, or cultivate salt-tolerant crop varieties.
While both superphosphate and calcium-magnesium phosphate fertilizer are phosphate-based, they differ in chemical composition, usage, application methods, economic viability, and environmental impact. When selecting and using these fertilizers, agricultural needs and soil conditions should be carefully considered.
