NPK compound fertilizer how to apply
1. Ammonium phosphate
Ammonium phosphate is made of ammonia and phosphoric acid. Due to the different content of ammonia, it can produce monoammonium phosphate, diammonium phosphate and triammonium phosphate respectively. It contains N14% – 18% and P2O5 46% – 50%. Pure ammonium phosphate is gray and dark gray due to impurities. Ammonium phosphate is soluble in water and has certain hygroscopicity. It is usually made into granules by adding anti humidity agent to facilitate storage, transportation and application.
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Ammonium phosphate is suitable for all kinds of crops and soils, especially for the crops that need more phosphorus and the soils that lack phosphorus. The amount of phosphorus should be considered first in the application of ammonium phosphate. Insufficient nitrogen can be used as nitrogen supplement, and ammonium phosphate can be used as base fertilizer, flour fertilizer and seed fertilizer.
As base fertilizer and flour fertilizer, generally 10-15kg per 667m2 can be applied in furrow or hole, 2-3kg per 667m2 can be used as seed fertilizer, but it is not suitable to contact with seeds to prevent affecting germination and causing seedling burning. 5 kg per plant, surface fertilizer can be applied outside the root, the concentration is 0. 5-1%. Ammonium phosphate can not be mixed with plant ash, lime and other alkaline substances or stored. In order to avoid the loss of nitrogen volatilization and reduce the availability of phosphorus, it is necessary to apply ammonium phosphate every 4-5 days when applying lime on acid soil.
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Classification characteristics and application of ammonium phosphate and ammoniated superphosphate compound fertilizer.
2. Ammoniated superphosphate
In order to remove the adverse effect of free acid in superphosphate, a certain amount of ammonia is usually injected into superphosphate to produce ammoniated superphosphate. Its main components are NH4H2PO4, CaHPO4 and (NH4) 2SO4, containing N2% – 3% and P2O5 13% – 15%. Ammonium superphosphate is dry, loose, soluble in water (phosphorus is weak acid soluble), free acid, non corrosive, weak hygroscopicity and agglomeration, good physical properties and relatively stable performance.
The fertilizer effect of ammoniated superphosphate is slightly better than that of superphosphate, which is suitable for all kinds of crops. The best effect was applied to acid soil. It should not be mixed with alkaline substances to prevent ammonia volatilization and phosphorus degradation. Due to the low nitrogen content, the application method of other nitrogen fertilizers should be the same as that of SSP.