First, farmyard fertilizers must be matured. Greenhouse vegetables should be fully cooked when applying farmyard fertilizers. Because there is no decomposing farmhouse with fertilized pathogens and eggs, it is easy to spread the disease after it is applied to vegetables. In addition, if the farmhouse fertilizer is put into a greenhouse and then decomposed, ammonia burning burned seedlings will be produced.

Second, the fertilization method should be scientific and reasonable. Basal fertilizer is best applied one week before the colonization of vegetables, and it should be mixed well with the soil. Fertilizer can be planted at a distance of 7-10 cm from the plant or in a hole. Cover fertilizer and water immediately after top dressing. Never apply fertilizer directly to the ground or plants to prevent the fertilizer from volatilizing or burning the vegetable seedlings.

Third, the amount of chemical fertilizer should be appropriate. Since fertilizers in greenhouses are not easily lost, excessive application of chemical fertilizers can cause an increase in the concentration of salts in the soil, which can affect the normal growth of vegetables and cause secondary salinization. Therefore, fertilization before fertilization, formula fertilization must not be blindly applied.

Fourth, the application of trace fertilizer should be appropriate. Although the demand for trace element fertilizers on vegetables is small, its role in the metabolism of vegetables is very great. The commonly used micronutrients include boron, molybdenum, zinc, and iron fertilizers. Micronutrients are used as basal fertilizers and can also be used for seed dressing, soaking or top dressing. The range between the appropriate amount of fertilizer and excess fertilizer is relatively narrow, so the amount must be accurate to avoid causing fertilizer damage.

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