Diammonium phosphate is a compound fertilizer containing both nitrogen and phosphorus nutrients. It is a high concentration quick acting fertilizer with less solid after dissolution, suitable for various crops and soils, especially for crops that prefer nitrogen and phosphorus. It can be used as a base fertilizer or topdressing. When applied to acidic soil, it can reduce the fixation of iron and aluminum on phosphorus, maintain high effectiveness of phosphorus, and should be applied deeply. It can be used as a feed additive for ruminants in animal husbandry.