Water Soluble Phosphate Fertilizer
Water soluble phosphate fertilizer refers to the phosphorus element in the form of water-soluble form (such as calcium phosphate, calcium dihydrogen phosphate, etc.) exist in the phosphorus fertilizer, this kind of fertilizer in the phosphorus can be directly dissolved in water, by the root system of the plant to quickly absorb and use. It is a kind of high efficient phosphorus fertilizer commonly used in agriculture, especially suitable for crops or soils that need phosphorus urgently.
Product Features & Applications
Main Characteristics
Fast absorption and rapid fertilizer effect
Phosphorus in water-soluble phosphate fertilizer exists in ionic state (such as H₂PO₄-, HPO₄²-), which can be directly absorbed by the plant root system without decomposition and transformation of soil microorganisms, so the effect is fast, and it is suitable to be used as a follow-up fertilizer or emergency phosphorus supplement.
Soluble in water and highly mobile
When dissolved in water, phosphorus ions can migrate with water in the soil, but the range of movement is limited (usually only a few centimeters), so it needs to be applied close to the root system.
Easy to be fixed by the soil
Phosphorus in water-soluble phosphate fertilizer is easy to combine with calcium, iron, aluminum and other ions in the soil to form insoluble phosphate (such as calcium phosphate, iron phosphate), resulting in a reduction in fertilizer efficiency. Therefore, the application needs to pay attention to the method.
Common types of water-soluble phosphate fertilizers
1. Calcium superphosphate:
Composition: Mainly contains monocalcium phosphate monohydrate, the effective P₂O₅ content is generally about 12-20%. It also contains about 50% gypsum and a small amount of free acid, iron, aluminum, manganese and other impurities.
Features:
One of the most traditional and widely used phosphorus fertilizers.
Contains free acid, is acidic and somewhat corrosive.
In addition to providing phosphorus, it also provides sulfur (from gypsum) and calcium.
It is susceptible to iron and aluminum fixation in acidic soils and calcium fixation in calcareous soils, which reduces effectiveness (a common problem faced by all water-soluble phosphorus fertilizers in soils).
Appearance: Usually off-white, light gray or dark gray powder or granule with sour smell.
2. Heavy calcium superphosphate:
Composition: Contains mainly monocalcium phosphate monohydrate with a very high effective P₂O₅ content of 40-50%. Almost free of gypsum.
Features:
It is a concentrated version of calcium superphosphate, with 2-3 times the effective phosphorus content.
Contains no gypsum, so no sulfur can be provided.
The free acid content is also high and acidic.
Transportation and application costs per unit of phosphorus are relatively low.
Appearance: Similar to calcium superphosphate, but may be darker in color.
3. Ammonium phosphate fertilizer (nitrogen-phosphorus compound fertilizer):
Key Representatives:
Monoammonium phosphate: chemical formula NH₄H₂PO₄, containing about 11-12% N and 48-61% P₂O₅.
Diammonium phosphate: chemical formula (NH₄)₂HPO₄, containing about 16-18% N and 46-48% P₂O₅.
Features:
Highly concentrated compound fertilizer, providing both fast-acting nitrogen and fast-acting phosphorus. Excellent water solubility, very suitable for water fertilizer integration. Good physical properties, mostly granular, not easy to absorb moisture caking. It is an important product of modern fertilizer industry and widely used.
Appearance: usually gray, brown or light yellow granules.
Our Factory
Monband adheres to customer-centric, striver-based, and strives for global specialty fertilizers.
Monband, committed to improve global crop quality and yield, saving defective soil, improving soil fertility, improving plant root growth environment, improving fertilizer utilization, reducing fertilizer use, and thereby increasing farmers'income.
Based on social responsibility and environmental protection, Monband has passed scientific innovation and quality management system lS09001: 2015, environmental management system lS014001:2015 occupational health and safety management system lS045001:2018 certification. To provide growers with high quality and environmentally friendly products, and with systematic nutrition solutions, to serve global growers, and strive for human safety, crop health, a better life.
Our Certificate
Five products have been certified by EU REACH
Member of International Fertilizer Industry Association (lFA)
Frequently Asked Questions (FAQ)
Q: What is the difference between water-soluble phosphate fertilizers and ordinary phosphate fertilizers (e.g. calcium-magnesium phosphate fertilizers or phosphate powder)?
A: The key difference between water-soluble phosphate fertilizer and ordinary phosphate fertilizer (such as calcium-magnesium phosphate fertilizer or phosphate powder) is that the phosphorus nutrients (usually expressed as phosphorus pentoxide P₂O₅) can be directly dissolved in water, which makes the phosphorus can be rapidly absorbed by the root system of the plant or utilized by plants through the soil solution, and therefore has the characteristics of strong quick-acting; whereas ordinary phosphate fertilizer, such as calcium-magnesium phosphate fertilizer, can be dissolved in weak acid (beryllium-soluble), and phosphorus powder can be dissolved in strong acid (difficult to soluble), which makes it difficult for the plant to use the phosphorus. Strong acid (insoluble), they release phosphorus slowly, belonging to the slow-acting or late-acting fertilizers.
Q: Why is it said that water-soluble phosphate fertilizer is easily "fixed" by the soil? What can be done to reduce the loss of this fixation?
A: The reason why water-soluble phosphate fertilizer is easily fixed by soil is mainly related to soil acidity and alkalinity: in acidic soil, dissolved phosphate ions are easily combined with iron and aluminum ions to form insoluble iron phosphate or aluminum phosphate compounds; while in alkaline (calcareous) soil, it is easy to be combined with calcium ions to form insoluble calcium phosphate precipitation. In order to reduce the fixed loss, you can take concentrated application (such as hole, strip or furrow) to reduce the contact area between fertilizer and soil, mix water-soluble phosphorus fertilizer with organic fertilizer to make use of the protective effect of organic matter on phosphorus, apply small amounts of phosphorus in small portions to avoid one-time excess, or give priority to the use of water-fertilizer integration technology such as drip irrigation, sprinkler irrigation and foliar spraying bypassing the soil to supply the plant directly.
Q: Which crops or growth stages are particularly suitable for using water-soluble phosphate fertilizer?
A: Water-soluble phosphorus fertilizer is particularly suitable for scenarios that require rapid phosphorus supplementation in a short period of time due to its quick-acting nature, such as the seedling stage of crops (e.g., rice, wheat, corn) to promote root development and alleviate the phenomenon of early phosphorus deficiency and purple, the critical period of crop blossoming and fruiting (e.g., tomatoes, chili peppers, and fruit trees) to support the differentiation of flower buds, blossoming and fruiting, and the economically valuable economic crops, such as vegetables and flowers, used for precision fertilization to improve quality and yield, and any crop grown on phosphorus-deficient soils that exhibits significant symptoms of phosphorus deficiency.
Q: Are all water-soluble phosphate fertilizers suitable for foliar spraying?
A: Not all water-soluble phosphate fertilizers are suitable for foliar spraying. Water-soluble phosphate fertilizers suitable for foliar spraying must meet two key conditions: first, high purity and low salt index to avoid burning leaves, such as potassium dihydrogen phosphate (KH₂PO₄) is the most commonly used foliar spraying of phosphorus and potassium fertilizers; secondly, the concentration of spraying solution must be strictly controlled, and it is usually recommended to use a low concentration of solution of 0.1% to 0.3% (i.e., 1g to 3g of fertilizer dissolved in 1 liter of water). Low-concentration solutions are usually recommended. Foliar sprays bypass the soil and are rapidly absorbed by the leaves within 5 to 48 hours, and are particularly suitable for situations where root uptake is reduced or soil fixation is too strong.
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