MAP and DAP are commonly used ammonium phosphate fertilizers. Both supplement phosphorus and are important raw materials in NPK fertilizer production lines. After processing by fertilizer granulators, they are widely used in planting. Due to differences in nitrogen-phosphorus ratios and chemical properties, their applicable scenarios and fertilizer effects differ significantly. Accurate differentiation is crucial for improving fertilizer efficiency.

The core difference lies in the nitrogen-phosphorus ratio and chemical properties: MAP contains approximately 12% nitrogen and 52% phosphorus, with a nitrogen-phosphorus ratio of 1:4. It is acidic and can lower soil pH. DAP contains approximately 18% nitrogen and 46% phosphorus, with a nitrogen-phosphorus ratio of 1:2.5. It is alkaline, and long-term application can easily lead to soil alkalization, making it unsuitable for alkaline soils.

The fertilizer effects and suitable crops differ: MAP is suitable for alkaline and neutral soils, alleviating alkalization, and is suitable for acid-loving crops with high phosphorus requirements (such as vegetables and fruit trees); DAP has a high nitrogen content and rapid fertilizer release, suitable for neutral and acidic soils, and is suitable for field crops such as corn and wheat, providing both nitrogen and phosphorus supplementation.

Application precautions differ: MAP can be mixed with most fertilizers; DAP should not be mixed with acidic fertilizers, and when applied to alkaline soils, it needs to be combined with organic fertilizers to adjust the pH.

In summary, the core differences between the two lie in the nitrogen-to-phosphorus ratio and pH. As raw materials for NPK fertilizer production lines, after processing by a fertilizer granulator, MAP is chosen for alkaline soils and acid-loving crops; DAP is chosen for acidic-neutral soils and field crops.