DAP typically contains 18% nitrogen in the ammonium form and 46% phosphate. It is sometimes expressed as 18-46-0. DAP is made by the action of ammonia with phosphoric acid, the resulting salt is completely water-soluble.

Because the water-solubility of DAP is very high it is used in both solid and clear-liquid fertilisers. It is often more expensive than MAP, so it is not always imported into the UK in every season. MAP is much more commonly used.

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