Compound fertilizer refers to chemical fertilizer containing two or more nutrient elements. Compound fertilizer has the advantages of high nutrient content, few by-products and good physical properties, and plays a very important role in balancing fertilization, improving fertilizer utilization rate and promoting high and stable yield of crops.
However, it also has some shortcomings, such as its nutrient ratio is always fixed, while the types, quantities and proportions of nutrient elements needed by different soils and crops are diverse.
Therefore, it is best to test the soil before use to understand the texture and nutritional status of the soil in the field, and at the same time, pay attention to the application with unit fertilizer, and the effect is better.
In the production of compound fertilizer, soil testing formula is often used to determine soil nutrients. What is the basis of soil testing and formula fertilization? Based on the field experiment of soil testing and formula fertilization, according to the law of crop fertilizer demand, soil fertility and fertilizer effect, and on the basis of rational application of organic fertilizer, the application amount, application period and application method of nitrogen, phosphorus, potassium and trace elements were put forward. Generally speaking, it is the scientific application of formula fertilizer under the guidance of agricultural science and technology personnel.