The concept of compound fertilizer

A chemical fertilizer that contains two or more components of major nutrients such as N, P, and K at the same time is called a compound fertilizer. Those containing two main nutrient elements are called binary compound fertilizers, those containing three main nutrient elements are called ternary compound fertilizers, and those containing more than three nutrient elements are called multi-compound fertilizers. Compound fertilizers are customarily represented by the corresponding percentage content of N-P2O5-K2O. If a certain compound fertilizer contains 10% N, 520% P2O, and 10% K2O, the compound fertilizer is expressed as 10-20-10. Some are also marked with S after the K2O content number, such as 12-24-12 (S), which means it contains K2SO4. Compound fertilizers can be divided into three categories according to their manufacturing processes: chemical compound fertilizers, formulated compound fertilizers and mixed compound fertilizers. Chemical compound fertilizers are compound fertilizers made through chemical methods, such as potassium dihydrogen phosphate. Formulated compound fertilizer is a compound fertilizer containing multiple elements that is re-granulated from two or more elemental fertilizers through a certain processing technology at a fertilizer manufacturer. Partial chemical reactions occur during the processing. What is commonly referred to as compound fertilizer is compound fertilizer. Mixed fertilizer mostly refers to this kind of compound fertilizer. Mixed compound fertilizer is a compound fertilizer made by mechanically mixing several fertilizers. During the processing, it is simply mechanically mixed without chemical reaction. For example, ammonium chloride and ammonium phosphate are mixed together.