NPK compound fertilizer

Due to the need of agriculture, compound fertilizer especially high concentration compound fertilizer is the inevitable trend of the development of fertilizer varieties. The early fertilizer industry in most countries was dominated by the production of unit fertilizers (fertilizers containing one nutrient element). In the United States, it was based on superphosphate, mixed (and sometimes granulated) with Peruvian guano, Chilean saltpeter, potassium salt, and some organic waste in the early 20th century. In the U.S., Western Europe, and Japan, 40 to 50 percent of N, 80 to 85 percent of P2O5, and 85 to 90 percent of K2O are supplied in the form of composite fertilizers. With the development of soil fertilizer science and agricultural fertilization technology, agriculture has been moving towards scientific fertilization. Scientific fertilization must be based on different soil types and properties, fertility levels, crop types and climatic conditions and other factors to determine the variety and amount of fertilization, so that the soil can avoid excessive application or shortage of one or several nutrients caused by waste.