Compound chemical fertilizers refer to chemical fertilizers containing two or more nutrients such as nitrogen, phosphorus, and potassium. A compound fertilizer containing two nutrients is called a binary compound fertilizer, and a compound fertilizer containing three nutrients is called a ternary compound fertilizer. Compound fertilizers are generally represented by the corresponding percentage contents of N, P2O5, and K2O. According to different production methods, it can be divided into two categories: chemical compound fertilizers and mixed compound fertilizers. Currently, the commonly used compound fertilizers

There are several types of chemical fertilizers: first, binary compound fertilizers

Nitrogen phosphorus compound fertilizer ammonium phosphate: It is a popular binary compound chemical fertilizer of nitrogen and phosphorus among the masses. Its properties are relatively stable, generally gray white or gray particles, non hygroscopic clumping, easily soluble in water, and the pH value of the aqueous solution is 7.0 to 7.2. It is a chemical neutral fertilizer. Both nitrogen and phosphorus are easily absorbed and utilized by plants. Application method: Ammonium phosphate is a nitrogen phosphorus compound fertilizer mainly composed of phosphorus. Suitable for phosphorus deficient soils and plants with high phosphorus requirements. Granular ammonium phosphate is suitable for strip application as seed fertilizer and base fertilizer. The general usage of base fertilizer is around 7.5 kilograms per mu; The amount of seed fertilizer used is generally 2.5 to 3 kilograms per mu, and it should not be directly touched when used as seed fertilizer; Topdressing is generally applied at a rate of 10 to 15 kilograms per acre. It should be noted that ammonium phosphate should not be mixed with alkaline fertilizers such as plant ash and lime to avoid volatilization of ammonia and reduction of phosphorus.