1. General-purpose compound fertilizer:
The general-purpose compound fertilizer mainly has several ratios of 15-15-15, 16-16-16, 17-17-17, 18-18-18, and the total content of NPK is as high as 45-54%. Comprehensive nutrient, long-lasting fertilizer efficiency and high utilization rate are beneficial to balance soil nutrients and fertility, generally increasing yield by 20-30%.
General-purpose compound fertilizer is widely used in all kinds of soils and various crops. It is mainly based on base fertilizer, which is combined with ploughing and land preparation, and the soil layer is up to 15cm deep, which is beneficial to improve fertilizer efficiency, prolong fertilizer efficiency, and avoid burning seedlings. To prevent the seedling period from prolonging; when making the base fertilizer or the seedling fertilizer, care should be taken to keep the distance between the fertilizer granules and the seed or crop roots 8-12 cm, which is safer. The specific fertilization amount depends on the crop type and yield index. Take 15-15-15 as an example. The application amount of field crops per acre is 30-50 kg, the amount of vegetable crop per mu is 40-60 kg, and the amount of adult fruit trees per plant per plant. For 1.5-2 kg, the amount of fertilizer is generally determined by the yield, and the amount of fertilizer increases as the yield increases.
2. High nitrogen compound fertilizer:
The high-nitrogen compound fertilizer mainly has several ratios of 30-10-11, 25-10-16, 20-10-10, and 28-6-6. The product is smooth, high in water solubility, and high in nitrogen. Wide range and significant increase in production.
The content of nitrogen in high-nitrogen compound fertilizer is significantly higher than that of phosphorus and potassium. It is suitable for various field crops and economic crops, such as wheat, corn, rice, cotton, etc. It can be used as base fertilizer and top dressing. At 30-50 kg, it is especially suitable for topdressing of vegetables and fruit trees.
3. High nitrogen and high potassium compound fertilizer:
High-nitrogen and high-potassium compound fertilizers mainly have 17-6-22, 16-6-20, 22-5-13, 20-10-15, 15-10-15, 18-9-18 ratios. This product can be used as base fertilizer or top dressing, which can significantly improve crop disease resistance and lodging resistance, promote grain fullness, increase grain weight, increase yield and improve quality.
High-nitrogen and high-potassium compound fertilizers are mainly used in crops such as wheat, rice, corn and cotton in high-yield fields, and can also be used in sweet potato, tuber vegetables, fruit trees and other crops, especially in cotton flowering and bolling, fruit tree fruiting period. The effect is better.
4. High nitrogen and high phosphorus compound fertilizer:
The high nitrogen and high phosphorus compound fertilizers have relatively high nitrogen and phosphorus contents, mainly 15-20-10, 14-25-6, 12-22-14, 18-22-8 and so on. This product is mainly suitable for oil crops such as peanuts and soybeans, as well as fruits and vegetables, and is more suitable for promotion and application in medium and low-yield fields and phosphorus-deficient areas.
The choice of compound fertilizer can be flexibly controlled according to local crop types, soil fertility status and yield level. Zinc-powered compound fertilizer is suitable for crops such as wheat, corn, rice, cotton, etc. Nitrogen-based compound fertilizer is suitable for dry crops, especially for fruits and vegetables. It is particularly emphasized that fruit-based, vegetable, tobacco and other chlorine-sensitive crops and saline-alkali plots should not be applied with chlorine-based compound fertilizer, and pure sulfur-based compound fertilizer can be used to improve the quality of agricultural products and increase economic benefits.