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The nutrient ratio of nitrogen, phosphorus and potassium contained in any compound fertilizer is fixed, and the amount of base fertilizer is calculated based on the content of phosphorus or potassium, and half of nitrogen fertilizer is required to be applied as top dressing in the middle and later stages.
Compound fertilizers are generally not suitable for top dressing or water flushing. The phosphate fertilizer, even if it is fully soluble, is rarely moved downwards on the soil surface, making it difficult to use the crop root system. Although friends of vegetable farmers in Guangdong are accustomed to using imported 45% (15%-15%-15%) of the compound fertilizer with water-soluble watered leaf vegetables as a significant fertilizer, their nutrient use efficiency is low, which not only wastes fertilizer. The cost is not worthwhile and needs improvement.
Specific application method of compound fertilizer
Compound fertilizer is suitable as base fertilizer. The application method of basal fertilizer: When cultivating the soil before sowing, the compound fertilizer containing various nutrients of nitrogen, phosphorus and potassium is applied to the soil in a certain depth. The depth of fertilization varies from crop to crop. The fertilization depth for grains and vegetables is generally 20 cm, and the fertilization depth for fruit trees is 30-40 cm. Only when the compound fertilizer is applied to a certain depth can the nutrients in the later stage of the crop be supplied. The basal compound fertilizer is applied to all phosphorus and most of the potassium needed for the growing period of the crop. Because of its lively nature, nitrogen can only be applied to the basal fertilizer through compound fertilizer. At least half of the nitrogen should be applied in the form of simple nitrogen fertilizer during the vigorous growth of crops. Therefore, compound fertilizer is suitable for basal fertilizer, and the proportion of nitrogen cannot be too high.