Now that temperatures are gradually picking up, greenhouse vegetables are starting to grow, and management measures such as fertilizing and watering are about to start in full swing. Due to the large amount of fertilizer applied in greenhouses, the winter and spring seasons are tightly closed, and the temperature is low and the light is weak. The activity of nitrate reductase in vegetables is low and nitrates are easily accumulated. Only by applying scientific and rational fertilization can we reduce the accumulation of nitrate in vegetables. Now briefly introduce the main points of attention for greenhouse vegetable fertilization.
1. It is forbidden to use nitrate-nitrogen fertilizers such as ammonium nitrate, potassium nitrate and other nitrate-nitrogen fertilizers to make nitrate accumulation in vegetables easier. In addition, it is not suitable to apply chlorinated fertilizers such as potassium chloride, ammonium chloride, etc., because the chloride ions can reduce the starch and sugar content of vegetables, reduce the quality of the vegetables, reduce the yield, and cause soil compaction. Such as magnesium sulfate, ammonium sulfate and other fertilizers, applied to the soil, the decomposition of sulfate ions, not easily absorbed by vegetables and stay in the soil, endangering the growth of vegetables. Ammonium bicarbonate is forbidden to be used because of its high volatilization of ammonia, which can easily cause ammonia damage.
2. Appropriately control the amount of nitrogen fertilizer The amount of nitrogen fertilizer should be determined according to the amount of fertilizer required by different vegetables. Normally, it is appropriate to use 10~12kg pure nitrogen per acre. Nitrogen fertilizer should be applied deeply and applied in combination with phosphorus and potassium fertilizer, or ternary compound fertilizer. After the application, the soil should be covered in a timely manner to reduce the loss and increase the utilization rate. The top dressing should be stopped 20 days before the harvest.
3. Reapply organic fertilizer. Organic manure is mainly based on basal fertilizers, and generally 4,000-5,000 kilograms of organic fertilizer is fully cooked per acre. If an insufficiently cooked organic fertilizer is applied, the heat generated during the continuous fermentation process will cause the crop to burn roots, and the pathogenic eggs in the manure will be easily brought into the shed. Manure will cause harmful gases in the fermentation process to harm the vegetables.
4, nitrogen, phosphorus, potassium and trace elements with the application. At present, the promotion of formula fertilization and balanced fertilization in the cultivation of nuisanceless vegetables is based on the nutritional characteristics of vegetables, the characteristics of soil fertilization, and the effect of fertilizer production, and quantification of fertilization. In the fertilization, we must adhere to the principles of fertilizing organic fertilizers and chemical fertilizers, so that the supply of nitrogen, phosphorus and potassium nutrients must be balanced, and a large number of elements and trace elements must be balanced. In addition, the top dressing in the greenhouse can be properly used foliar spray, such as urea, potassium dihydrogen phosphate and calcium nitrate, boron, zinc, molybdenum and other trace elements.
Organic materials: also known as organic polymer materials, generally by C, H, O and other elements of the relative molecular weight of more than 100,000 (of course, there are other elements, such as S or P, etc.) generally speaking, solubility (divided into two kinds of swelling and dissolution), thermoplasticity (high temperature into the kind of viscosity) And thermosetting (seemingly low temperature and return to solid state), strength characteristics (than carbon or steel and other materials made of general strength is about twice its strength), electrical insulation, general organic materials have rubber, cellulose, protein, starch, high polymer, etc.
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Organic Raw Material,Organic Material,Phosphoric Acid Tripropyl Ester,1 2-Dihydroxypropane
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