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First, farmyard fertilizers must be matured. Greenhouse vegetables should be fully cooked when applying farmyard fertilizers. Because there is no decomposed farmhouse fat and bacteria 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 burn vegetable seedlings will be produced. Therefore, the farmyard fertilizer must be fully decomposed and then fertilized.
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 7-10 cm away from the plant ditch or hole chase, top dressing immediately after dressing, watering, do not sprinkle fertilizer directly on the ground or plants, so as not to volatilize fertilizer or burn vegetable seedlings. Fertilizers outside the root should be in the peak season of vegetables and fertilizers, and it is best to choose the time of cloudy or late evening. Spray the fertilizer solution to the back of new leaves and leaves as much as possible to facilitate the absorption of vegetables.
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. Micro-fertilizer is used as base fertilizer 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.
The fifth is to use plant growth regulators properly. The use of good plant growth regulators will promote the production of vegetables. However, each type of conditioner has a certain range of conditions and scope for its application. In particular, it is necessary to grasp the time and concentration of use, and it cannot be sloppy, otherwise the effect of increasing the yield of vegetables cannot be achieved.
The "Five Factors" of Fertilization in Greenhouse Vegetables
According to experts, when farmers apply fertilizer to shed vegetables, they need to grasp the following five technical links: