The working principle of the DAP agricultural fertilizer production line is mainly based on the chemical synthesis process of diammonium phosphate (DAP). DAP is a binary high-efficiency compound fertilizer containing two nutrients, nitrogen and phosphorus. Its production involves a variety of processes and equipment.

As one of the three macronutrients, phosphorus is an essential nutrient in crop production. Phosphorus assists plants in developing strong stems and roots, warding off disease, and giving plants the opportunity to thrive.To provide plants with the best source of phosphorus, phosphate rock is typically converted into phosphate fertilizer, most commonly MAP and DAP.