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Ammonium Phosphate

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Ammonium Phosphate, also known as triammonium Phosphate, inorganic compound, molecular formula (NH4) 3PO4, is an Ammonium Salt of phosphoric acid, containing anhydrous substances and hydrates. Ammonium phosphate is a colorless crystal or gray white powder, sometimes particles, soluble in water. Ammonium phosphate contains nitrogen and phosphorus. It is a compound fertilizer.


When ammonium phosphate is used as fertilizer in agriculture, special attention should be paid to its thermal decomposition and alkali decomposition. In calcareous soils with pH greater than 7.5, decomposition and volatilization of ammonia are easy to occur, and water-soluble phosphorus is transformed into Citric Acid-soluble phosphorus. The main chemical reactions were:

CaCO3+ (NH4) 2HPO4 - 2NH3+CaHPO4+CO2+H2O

Ammonium phosphate is a kind of high concentration and quick-acting compound fertilizer. Its content of N+P2O5 is about 64%, which is soluble in water and has a high salt index. The salt indices of monoammonium phosphate and diammonium phosphate are 30 and 34, respectively. Therefore, special attention should be paid to not contacting seeds directly when planting fertilizer, and the fertilization point should not be too close to the young roots and buds when making base fertilizer, so as to avoid the burning of ammonia released from the molecule. Ammonium phosphate can be used as base fertilizer and topdressing fertilizer, but because its molecule contains more phosphorus nutrients than nitrogen, its N:P2O5 ratio of monoammonium phosphate is about 1:5 and diammonium phosphate is about 1:2.5. In order to make the phosphorus contained in it play a full role in the early stage of crop growth, it is generally suitable to be used as base fertilizer, for those soils with higher available phosphorus or for rice. For crops with relatively less phosphorus, even as base fertilizer, a certain amount of nitrogen fertilizer should be applied to adjust the proportion of N:P2O5 to an appropriate level. Ammonium phosphate can be mixed with most fertilizers, but it should be avoided to mix with alkaline fertilizers, because it can promote the decomposition of ammonium phosphate and release ammonia.

In addition, using ammonium phosphate as raw material, a variety of compound fertilizers can also be prepared. The main varieties are: (1) ammonium thiophosphate. If the grade of ammonium thiophosphate produced by 32% monoammonium phosphate and 59% Ammonium Sulfate is 16-20-0, the product has good physical properties, the critical moisture absorption point is 75.8%, higher than that of monoammonium phosphate; 2. ammonium nitrate. The grade of representative varieties is 25-25-0, 28-14-0 and so on, which are products neutralized by mixed acid of phosphoric acid and nitric acid and ammonia; and (3) ammonium uric phosphate. This is a kind of high concentration solid compound fertilizer, which has N-P and N-P-K types, such as 28-28-0 and 22-22-11 varieties. It is generally made of ammonium phosphate slurry or granulated powder products and spraying granulated urea. The product has good physical properties and is suitable for a variety of soils and crops.

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