Compound fertilizer refers to a fertilizer containing two or more nutrients. It is a fertilizer produced by a fertilizer machine such as a
granulator machine. In addition to the granulator, the
NPK compound fertilizer production line requires a series of other mechanical equipment.
NPK fertilizer has the advantages of high nutrient content, less auxiliary components and good physical properties. It plays an important role in balancing fertilization, improving fertilizer utilization rate and promoting high yield and stable yield of crops. However, it also has some shortcomings, such as its nutrient ratio is always fixed, and the types, quantities and proportions of nutrients required for different soils and different crops are diverse. Therefore, it is best to conduct soil testing before use to understand the texture and nutritional status of the soil in the field.
At present, the development of compound fertilizer has three major trends: the first is the specialization of multiple varieties. Different crops have different special fertilizers, and special fertilizers are developed according to the law of crop growth and development and the amount of fertilizer absorbed. When selecting compound fertilizer, farmers should choose the corresponding special fertilizer according to different crops. If it is not special, it will violate the law of crop absorption, so that the potential for crop yield increase will not be realized, and some nutrients will be wasted. The second is multi-functional medicinalization. The combination of pesticides and fertilizers eliminates the pesticide dressing procedure. Once applied, it can ensure the nutrients needed for crops and prevent underground pests and seedling diseases, which can have multiple effects. The third is long-term high concentration. With the development of agricultural production, high-concentration and long-acting compound fertilizer is more and more popular among farmers. The application of this type of fertilizer reduces the amount of fertilization, facilitates farming, eliminates the problem of topdressing, and reduces the labor.
It should be applied in combination with various fertilizers. Although most of the compound fertilizers are now diversified, they still cannot completely replace organic fertilizers. Where conditions permit, the application amount of decomposed organic fertilizers should be increased as much as possible. NPK fertilizer combined with organic fertilizer can improve fertilizer efficiency and nutrient utilization. The application of
organic fertilizer not only improves the soil, activates beneficial microorganisms in the soil, but more importantly saves energy and reduces environmental pollution. The use of some bio-organic fertilizers not only eliminates the cumbersome process of traditionally making organic fertilizers, but also provides a large number of beneficial microorganisms for the soil, activates soil nutrients, and reduces continuous cropping obstacles.
Although some special NPK fertilizers have determined the appropriate nutrient-distribution ratio according to the fertilizer characteristics of the crops and the fertilization characteristics of the soil, it is difficult to fully meet the requirements of actual crop growth on soils with different fertility levels. Therefore, it is necessary to use some single fertilizers according to the actual growth of the crops. For example, in the nitrogen-deficient soil, some nitrogen fertilizers should be used for leafy vegetables that require more nitrogen. In the potassium-deficient soil, some potassium fertilizer should be used in the later stage of watermelons with more potassium.
