2026-07-07
Answer: No. Calcium magnesium phosphate fertilizer is an alkaline fertilizer. If mixed with ammonium nitrogen fertilizer, it will cause fertilizer loss through a chain reaction of "alkaline contact with ammonia volatilization - nitrogen escape". The core mechanism and risks are as follows:
1. Alkaline environment triggers "ammonia escape" of ammonium nitrogen. After ammonium nitrogen fertilizer (such as ammonium sulfate, ammonium chloride, ammonium bicarbonate, etc.) is applied to the soil, its effective component exists in the form of ammonium ions (NH₄⁺). When ammonium nitrogen fertilizer is mixed with alkaline substances such as calcium magnesium phosphate fertilizer, the pH value around the fertilizer increases sharply. In a high pH environment, ammonium ions (NH₄⁺) will combine with hydroxide ions (OH⁻) to convert into ammonia molecules (NH₃) and water (H₂O). Ammonia molecules are gaseous and easily volatilize from the soil into the air, causing a large amount of nitrogen loss. This process can be represented by the following chemical reaction: NH₄⁺ + OH⁻ → NH₃↑ + H₂O
2. Main Affected Fertilizer Types
Ammonium nitrogen fertilizers that will cause ammonia volatilization when mixed with calcium magnesium phosphate fertilizers mainly include: ammonium bicarbonate, ammonium sulfate, ammonium chloride, ammonium nitrate, and ammonium phosphate. In addition, although urea itself is not an ammonium nitrogen fertilizer, it will hydrolyze into ammonium carbonate ((NH₄)₂CO₃) under the action of urease after being applied to the soil. If mixed with calcium magnesium phosphate fertilizers, it will also cause ammonia volatilization loss due to local pH increase.
3. Effects on Human and Animal Excrement
The main component of human and animal excrement is also nitrogen. Mixing it with alkaline fertilizers such as calcium magnesium phosphate fertilizers will also cause it to become ineffective due to acid-base neutralization.
4. Production and Application Recommendations: To prevent nitrogen loss caused by the mixed application of calcium magnesium phosphate (MgP) and ammonium nitrogen fertilizers, the following measures are recommended:
Separate Application: Apply MgP and ammonium nitrogen fertilizers separately and at intervals to avoid direct contact.
Control Application Sequence: If application is necessary in the same plot, apply MgP first and till it into the soil, then apply ammonium nitrogen fertilizer 3-5 days later, or vice versa, to avoid direct contact between fertilizer particles in the soil.
Deep Application and Covering: Deep application and covering with soil effectively reduce the pathways for ammonia volatilization to the surface, lowering the risk of nitrogen loss.
Fertilizer Process Optimization: In compound fertilizer production, if the formula requires the simultaneous use of alkaline phosphorus and ammonium nitrogen sources, the two should be encapsulated in different layers of the same particle through granulation, or a coating slow-release technology should be used to isolate the alkaline material from direct contact with ammonium nitrogen, reducing the risk of ammonia volatilization during mixed application. The incompatibility of mixing calcium magnesium phosphate fertilizers with ammonium nitrogen fertilizers stems from the chemical incompatibility between alkaline materials and ammonium nitrogen. Understanding this principle and implementing appropriate isolation and application measures in fertilization program design and fertilizer production can effectively prevent nitrogen loss and achieve efficient fertilizer utilization.
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