Project Description

Diammonium Phosphate ( DAP)

DAP is a high concentration of fast-acting fertilizer for a variety of crops and soil, offen used in basic fertilizer for all kinds crops.
Physical properties: This product is soluble in water, less dissolved solids, suitable for a variety of crops that need nitrogen, phosphorus, particularly suitable for drought areas as basic fertilizer, seed fertilizer,etc

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Product Description

Diammonium Phosphate(DAP) 21-53-0 is a product with high solubility in water, which ensures a rapid response to fertilization.As reaction fertilizer in the soil around a granule acidicication is generated that improves the utilization of phosphorus applied and available in the rhizosphere. Due to its nitrogen content ( present as ammonia), Diammonium phosphate(DAP) is good for crops that require these nutrients in its initial phase.

Diammonium phosphate (DAP) is the world’s most widely used phosphorus fertilizer. It’s made from two common constituents in the fertilizer industry, and its relatively high nutrient content and excellent physical properties make it a popular choice in farming and other industries.

Ammonium phosphate fertilizers first became available in the 1960s, and DAP rapidly became the most popular in this class of products. It’s formulated in a controlled reaction of phosphoric acid with ammonia, where the hot slurry is then cooled, granulated and sieved. DAP handles and stores well. The standard nutrient grade of DAP is relatively high, at 18-46-0, so fertilizer products with lower nutrient content may not be labeled DAP.

The inputs required to produce one ton of DAP fertilizer are approximately 1.5 to 2 tons of phosphate rock, 0.4 tons of sulfur (S) to dissolve the rock, and 0.2 tons of ammonia. Changes in the supply or price of any of these inputs will impact DAP prices and availability. The high nutrient content of DAP helps reduce handling, freight and application costs. DAP is produced in many locations in the world and is a widely traded fertilizer commodity.

The advantages of Diammonium phosphate(DAP)

(1)Fully water-soluble
(2)Consists of 100% plant nutrients
(3)Highly-concentrated source of phosphorus and nitrogen (as ammonia ) for plants
(4)Free of chloride, sodium and other detrimental elements for plants
(5)Excellent for low pH or alkaline soils
(6)Suitable for the fertigation, foliar application and production of fertilizer blends and nutrient solutions

Specification of Diammonium Phosphate

Component Range Typical
Main content 99%min 99%
P2O5 53%min 53%
NasNH4 20.8%min 21.0%
Moisture 0.2%max 0.2%
Insoluble 0.1%max 0.1%
As 0.0003%max 0.0003%
Pb 0.001%max 0.001%
F 0.002%max 0.002%

Benifit of Diammonium Phosphate

DAP fertilizer is an excellent source of P and nitrogen (N) for plant nutrition. It’s highly soluble and thus dissolves quickly in soil to release plant-available phosphate and ammonium. A notable property of DAP is the alkaline pH that develops around the dissolving granule.

As dissolving DAP granules release ammonium, the seedlings and plant roots nearest the volatile ammonia can be harmed. This potential damage more commonly occurs when the soil pH is greater than 7, a condition that often exists around the dissolving DAP granule. To prevent such damage, users should avoid placing high concentrations of DAP near germinating seeds.

The ammonium present in DAP is an excellent N source and will be gradually converted to nitrate by soil bacteria, resulting in a subsequent drop in pH. Therefore, the rise in soil pH surrounding DAP granules is a temporary effect. This initial rise in soil pH neighboring DAP can influence the micro-site reactions of phosphate and soil organic matter.


As a high concentration nitrogen and phosphorus compound fertilizer, it is a kind of high efficiency fertilizer widely used in vegetables, fruits, rice and wheat.

For industrial grade,It can be used as a flame retardant and Used in rubber.