For objective factors such as inadequate lighting condition and low temperature of shed vegetables, in order to promote the healthy growth of vegetables, it is reasonable to apply more fertilizer in shed vegetable production than in open field vegetables. However, the current status is that the amount of fertilizer is generally too large, and the proportion of nutrients is not balanced. This not only affects the normal growth, yield and quality of vegetables, but also shortens the useful life of greenhouses. Therefore, in the fertilization of vegetables, pay attention to the following points:
First, pay attention to proper fertilization and balanced fertilization. Save on fertilizer costs and control the excessive application of nitrogen and phosphorus fertilizers to ensure the high yield, quality, efficiency and sustainability of vegetable production.
Second, to cooperate with irrigation and fertilization. The irrigation of greenhouses is a small number of times. If large-water irrigation is used, it will inevitably carry a large amount of fertilization. Irrigation water will take away the fertilizers applied and the nutrients such as calcium and magnesium in the surface soil, substitution ammonium, etc., which will accelerate the greenhouse. Soil acidification and compaction.
Third, shed vegetables should be flushed with fertilizer. Fertilization can achieve the combination of water and fertilizer, fertilizer efficiency. However, to master the fertilizers used for fertilization must be fully water-soluble, nutrient types should be dominated by nitrogen and potassium, phosphorus less red; in order to prevent vegetable salt stress, try not to use ammonium chloride, potassium chloride. At the same time, we must also control the amount of fertilization each time. Taking nitrogen fertilizer as an example, the amount of pure nitrogen should be 3 to 5 kg/mu, preferably not more than 5 kg. In the flushing technique, it is required that the amount of water and fertilizer be distributed in a uniform manner without burning roots. Phosphorus topdressing vegetables do not use flushing, can use a small amount of root irrigation methods, with phosphorus, potassium Irrigation can promote root development, but also can be combined with avermectin and other components to reduce the incidence of double eyelid disease.
Fourth, apply carbon dioxide fertilizer. It is an auxiliary production increase measure for greenhouse vegetables. Increase the yield of vegetables by increasing the principle of photosynthesis. In the application of technology to grasp the fertilization time and the concentration of carbon dioxide and so on.
Fifth, the use of trace element fertilizers should be applied in late-stage vegetables. In recent years, shed vegetables are prone to fruit cracking, soft rot and other physiological diseases that affect the quality of the product. Therefore, it is recommended to use trace element fertilizers in the middle and later stages of vegetable, especially fruit and vegetable vegetables. The main ingredients are calcium, boron and magnesium fertilizers. Using the method of dressing fertilizers outside the roots, fertilizers can be selected as single or complex fertilizers, and do not use liquid fertilizers.
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