Greenhouse vegetables fertilizer tips

Scientific fertilization is an important measure to increase production of greenhouse vegetables. However, vegetable farmers often have problems in the process of greenhouse vegetable fertilization. The following greenhouse vegetable fertilization techniques are worth promoting:

First, limit nitrogen and phosphorus supplement potassium. Many greenhouse growers use large amounts of nitrogenous fertilizers such as urea and carbon ammonia in vegetable production. The amount of nitrogen applied far exceeds the required amount, resulting in a large amount of residual nitrogen in the soil. Too much nitrogen fertilizer can also cause the nitrate content of vegetables to increase and their quality decline. Nitrogen, phosphorus and potassium balanced fertilization of vegetables grow fast, individuals are robust and yields are high.

In general, vegetable crops are high in potassium, and most vegetable crops absorb more potassium than nitrogen (if the absorption of nitrogen is 100, the absorbed potassium is from 105 to the highest 250, with an average of 150-160). . Potassium fertilizer can enhance the resistance of vegetables, improve the photosynthesis and photosynthetic product running ability of vegetables. The amount of potash fertilizer is controlled between 150kg/mu and 250kg/mu. The use of solanaceous fruit and root vegetables is more, and the use of leafy vegetables is less. Potash is generally used as a base fertilizer, and if it is to be topdressed, it must be applied as early as possible. When applying potash fertilizer, it is necessary to deepen and concentrate.

Second, pay attention to foliar fertilizer. Foliar fertilization is an important means of fertilization. Foliar fertilization has the characteristics of rapid fertilizer effect, strong pertinence, convenient application and less consumption. Greenhouse vegetables are fertilized by foliage and can supplement potassium and trace elements. Vegetable growth requires more calcium, molybdenum and copper, and foliar sprays of calcium, molybdenum, and copper can balance vegetable nutrition, reduce vegetable disease, and increase vegetable yield.

Third, strict use of organic fertilizer. Pay attention to the application of organic fertilizer to ensure the nutrient balance of nitrogen, phosphorus, potassium and other nutrients, can improve the soil structure, increase soil water retention, fertility, but also increase the content of carbon dioxide in the soil. However, if the organic fertilizer is not properly applied, it may cause leaf roasting in cucumber leaves and tomato leaves, and it is also a major factor in polluting the environment and contaminating vegetables. There are many germs and parasite eggs in organic fertilizers that have not been decomposed, which can easily lead to diseases in vegetables, and may cause diseases and eggs to contaminate vegetables, especially leafy vegetables, and make people sick after eating them. Through the accumulation of decomposed fermentation, killing bacteria and parasite eggs can be applied to greenhouse vegetable production. In order to produce safe, pollution-free vegetables and prevent the spread of germs, decomposed human excreta and livestock excrement should be applied. The specific composting period is 1-2 months. In particular, raw chicken manure is not piled and it can cause vegetable diseases.

Fourth, the application of biogas fertilizer. The biogas residue is human feces and urine, livestock feces and plant residues in the biogas digester by microorganisms. The pathogens and eggs have been killed. Human fecal urine, livestock feces and plant residues have been decomposed and their fertilizer efficiency has been improved. According to the experimental results conducted by the Institute of Soil and Water Conservation of the Ministry of Water Resources of the Chinese Academy of Sciences in Yan'an City, Shaanxi Province, the application of biogas fertilizer, cucumber and tomato disease is light, and the yield is high. It is an ideal source of fertilizer for the production of pollution-free vegetables.

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