1. General-purpose compound fertilizer: The general-purpose compound fertilizer is mainly composed of 15-15-15, 16-16-16, 17-17-17 and 18-18-18. The total content of NPK is as high as 45- 54% This product has a reasonable formula, comprehensive nutrition, long-lasting fertilizer effect and high utilization rate, which is conducive to the balance of soil nutrients and fertility, and can generally increase production by 20-30%. General-purpose compound fertilizer is widely used in all kinds of soils and all kinds of crops. It is generally based on basal fertilizers, that is, it is applied in combination with ploughing and soil preparation. Soil depths of up to 15 cm will help improve fertilizer efficiency, extend fertilizer efficiency, and avoid seedling damage. In order to prevent seedlings from prosperous; when doing base fertilizers or seedlings, care should be taken to keep the distance between the fertilizer particles and the seeds or crop roots 8-12 centimeters away. This is safer. The specific fertilization amount depends on the type of crops and yield indicators. Take 15-15-15 as an example, the application amount of field crops per acre is 30-50 kg, the usage amount of vegetable crops is 40-60 kg, and the amount of each adult fruit tree per plant is used. For 1.5-2 kilograms, the amount of fertilizer is generally set by production, and the amount of fertilizer increases with the increase of yield. 2. High-nitrogen compound fertilizer: High-nitrogen compound fertilizer is mainly composed of 30-10-11, 25-10-16, 20-10-10, and 28-6-6. The product has smooth and water-soluble particles. High rate, high nitrogen quick effect, wide application range, significant increase in production. The content of nitrogen in high-nitrogen compound fertilizer is obviously higher than that of phosphorus and potassium. It is suitable for application to various field crops and economic crops, such as wheat, corn, rice, cotton, etc., and can be used as base fertilizer and top dressing, and the average amount per acre is generally. At 30-50 kg, it is especially suitable for top-dressing vegetables and fruit trees. 3. High Nitrogen and Potassium Compound Fertilizers: High nitrogen and high potassium compound fertilizers mainly include 17-6-22, 16-6-20, 22-5-13, 20-10-15, 15-10-15, 18 - 9-18 Several ratio formulas, this product can be used as a base fertilizer or top dressing, can significantly improve the crop resistance to disease, lodging resistance, promote full grain, increase grain weight, increase production and improve quality. High nitrogen and potassium fertilizers are mainly used in crops such as wheat, rice, corn and cotton in high-yielding fields, but also in sweet potatoes, tuber vegetables, fruit trees and other crops, especially in the flowering and fruit-blowing period of fruit trees. The effect is good. 4. High-nitrogen and high-phosphorus type compound fertilizer: The high-nitrogen and high-phosphorus type compound fertilizer has relatively high nitrogen and phosphorus content, mainly 15-20-10, 14-25-6, 12-22-14, 18-22-. 8 and so on. This product is mainly suitable for peanut, soybean and other oil crops and fruits and vegetables vegetables, more suitable for promotion in the low-yielding fields and phosphorus-deficient areas. The selection of compound fertilizer can be flexibly controlled according to the local crop species, soil fertility status and yield level. Zinc-powered compound fertilizers are suitable for crops such as wheat, corn, rice, and cotton. Nitrate-sulfur compound fertilizers are suitable for dryland crops and are particularly suitable for fruits and vegetables. Special emphasis is that fruit trees, vegetables, tobacco and other chlorine-sensitive crops and saline-alkali plots should not be applied chlorine-based compound fertilizer, pure sulfur-based compound fertilizer can be used to improve the quality of agricultural products and increase economic efficiency.