Thread Content
Fertilizers made by chemical methods or (and) mixed methods, containing any two or three of the crop nutrient elements nitrogen, phosphorus, and potassium. Its role is to meet the comprehensive needs and achieve balance for various nutrients required in agriculture under different production conditions. Their specifications are indicated by the percentage levels of N-P2O5-K2O; for example, 15-15-15 means that this compound fertilizer contains 15% each of N, P2O5, and K2O. Compound fertilizers can also contain one or several medium and/or trace nutrient elements; for example, 12-12-12-5(S) indicates that the compound fertilizer contains 12% each of N, P2O5, and K2O, as well as 5% S. In the United States, compound fertilizer and blended fertilizer are synonyms. In some European countries, the two have different meanings; compound fertilizers undergo significant chemical reactions during their production, such as ammonium phosphates, phosphate nitrates, potassium nitrate, and potassium phosphates ； Mixed fertilizers involve only simple mechanical mixing during the production process. Development Overview: Due to the needs of agriculture, compound fertilizers, especially those with high concentrations, represent an inevitable trend in the development of fertilizer types. Most of the early fertilizer industries focused on producing single-element fertilizers (fertilizers containing one nutrient element). As early as the early 20th century, the United States used superphosphate as a base, mixing it with Peruvian guano, Chilean nitrate, potassium salts, and various organic wastes (sometimes in granular form). Currently, in the United States, Western Europe, Japan, and other countries, 40%–50% of the total nitrogen consumption, 80%–85% of P2O5 consumption, and 85%–90% of K2O consumption is met through compound fertilizers. With the development of soil fertility science and agricultural fertilization techniques, agriculture has moved toward scientific fertilization. Scientific fertilization requires determining the type and amount of fertilizer to be used based on factors such as different soil types and properties, fertility levels, crop types, and climate conditions. This helps to avoid waste resulting from an excessive application of certain nutrients or a deficiency of one or several of them in the soil. Raw materials: The raw materials for producing compound fertilizers are some basic fertilizers and intermediate products. The main ones include *ao acid, sulfuric acid, urea, superphosphate, double superphosphate, ammonium phosphate fertilizers, potassium chloride, potassium sulfate, ammonia, various nitrogen-containing solutions, and phosphoric acid, etc.