Diammonium Phosphate (DAP) 18 46 0

Diammonium phosphate is a granulated fertilizer, with granules in size 5-5 mm (min. 95%). Granules can be white, grey or black (with tones) DAP contains 18% of nitrogen in ammonia form and 46% of phosphours as ammonium phosphate (exact formula can differ slightly depending on producer) Ammonia nitrogen is not leached from soil, is slowly uptaken by plants and facilitates phosphorus uptake, limits excessive uptake of potassium. Phosporus form is easy available for soil, also in water deficiency conditions. DAP is commonly used universal fertilizer which can be applied for field crops and for vegetables and in orchards.
Diammonium phosphate (DAP) is the world’s most widely used phosphorus (P) fertilizer. It is made from two common
constituents in the fertilizer industry and it is popular because of its relatively high nutrient content and its excellent
physical properties
Ammonium phosphate fertilizers first became available in the 1960s and DAP rapidly became the most popular in this
class of products. It is formulated in a controlled reaction of phosphoric acid with ammonia, where the hot slurry is then
cooled, granulated, and sieved. DAP has excellent handling and storage properties. The standard grade of DAP is 18-46-0
and fertilizer products with a lower nutrient content may not be labeled as 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 is helpful in reducing handling, freight, and application costs.
DAP is produced in many locations in the world and is a widely traded fertilizer commodity.

DAP fertilizer is an excellent source of P and nitrogen (N) for plant nutrition. It is 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.

Agricultural Use
DAP fertilizer is an excellent source of P and nitrogen (N) for plant nutrition. It is 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 ammonium is released from dissolving DAP granules, volatile ammonia can be harmful to seedlings and plant roots in
immediate proximity. This potential damage is more common when the soil pH is greater than 7, a condition that commonly
exists around the dissolving DAP granule. To prevent the possibility of seedling damage, care should be taken to 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 effeect.
This initial rise in soil pH neighboring DAP can influence the micro-site reactions of phosphate and soil organic matter.
There are differences in the initial chemical reaction between various commercial P fertilizers in soil, but these dissimilarities
become minor over time (within weeks or months) and are minimal as far as plant nutrition is concerned.
DAP is used in many applications as a fire retardant. For example, a mixture of DAP and other ingredients can be spread
in advance of the fire to prevent a forest from burning. It then becomes a nutrient source after the danger of fire has passed.
DAP is used in various industrial processes, such as metal finishing.

Granulated universal highly concentrated nitrogen-phosphorus fertilizer. Value of nitrogen and phosphorus 18-47 increases the resistance of plants to adverse environmental factors (drought and frost), and also increases the resistance of plants to disease. High content of phosphorus contributes to the accumulation of sugar in the root crops and fruits. Suitable for all soils and under all kinds of cultures as the basic fertilizer and as feed in the spring and summer period to speed up the ripening of fruits and berries.
DAP is used to provide plants with the phosphorus they need. Because it also includes sulfur, it provides plants with their sulfur requirements. If it does not provide enough sulfur, it should be combined with the necessary amount of sulfur-containing fertilizer. The phosphorus in this fertilizer reacts more quickly than the phosphorus in other fertilizers. The effects last for several years. DAP is applied to grain crops at the time of planting. If an insufficient amount of DAP is used, the roots will remain weak, development will be insufficient, maturity will be delayed, the plants will remain small, the leaves will take on a purple or dark green color and yield will be low. If it is applied too early, the phosphorus in the fertilizer will mix with the lime and other elements in the soil and lose its effectiveness. If it is applied after planting, it remains on the surface and has no value to the plant.