Shelf vegetables fertilize science
Greenhouse cultivation of vegetables is different from conventional open-field cultivation of vegetables. If fertilization is not scientific, it will not only affect the yield and quality of shed vegetables, but also cause shed soil salinization. Therefore, greenhouse vegetable fertilization is very stressful, mainly should pay attention to the following five points:
First, increase organic fertilizer organic fertilizer can improve soil structure, increase soil organic matter content, decomposition can also produce carbon dioxide, is very conducive to greenhouse vegetable growth and development, increase production and improve quality. In general, high-quality organic fertilizer should be applied at a rate of not less than 5,000 kg per acre, and as much as possible, apply some hot fertilizers such as worm manure, horse manure, and sheep manure.
Second, the selection of a suitable type of fertilizer The greenhouse soil is not affected by the rainfall, salt can not be lost or leached into the deep soil to go. If ammonium sulfate, potassium sulfate, potassium chloride and other fertilizers are applied to the soil, sulfate ions, chloride ions, etc. will be decomposed. These ions are not easily absorbed by crops, but remain in the shallow layer of the soil and increase the concentration of soil solution. Affect the growth and development of vegetables, reduce quality. Therefore, when applying chemical fertilizers to greenhouse vegetables, diammonium phosphate, ammonium phosphate, ammonium nitrate, superphosphate, urea, and potassium dihydrogen phosphate should be used.
Third, do not apply fresh human excrement Fresh human waste is applied to the greenhouse, due to the high temperature inside the greenhouse, fresh human waste will quickly decomposed Wanjie, the initial generation of urea and inorganic salts will increase the concentration of soil solution High, which affects the absorption of moisture and nutrients by vegetables. Fresh human excreta can also produce large amounts of ammonia, poisoning vegetables and causing burning. In addition, fresh human waste also contains pests that are harmful to the human body and direct use can affect human health. Therefore, human excreta can only be applied after 8 to 10 days of fermentation.
Fourth, nitrogen fertilizer to deep nitrogen fertilizer should be deep and cover soil, so that you can reduce the chance of contact with the air and avoid the volatilization of nitrogen fertilizer. At the same time, the deep application of nitrogen fertilizer can also reduce the accumulation of sulphate in vegetables and increase the utilization rate of nitrogen fertilizer. Generally, the depth of nitrogen fertilizer application should be less than 10 to 14 cm, and require immediate soiling after application.
Fifth, the application of fertilizer to the right amount of greenhouse vegetables once excessive fertilization, not only cause waste, but also will increase the concentration of soil salinity, nutrient reflux, endanger the vegetables. The fertilizing amount of shed vegetables should be flexibly controlled according to the type of soil and the variety of vegetables. The amount of chemical fertilizer applied once per acre is: 15 kg of ammonium nitrate sandy loam, 18 kg of loam or clay, 10 kg of urea sandy loam, 12 kg of loam or clay ; Kirsch superphosphate calcium sandy loam 40 kg, loam and clay 15 kg; diammonium phosphate sandy loam 25 kg, loam and clay 35 kg.
Our Special Intermediates are mainly a combination of our own actual product structure and product properties, including: 1. The product does not belong to any other product of our company intermediates, 2. Chemical reaction type is more special 3. Can be used to synthesize two or more kinds of API which roles is almost equivalent and difficult to separate the level. 4. This intermediate is somewhat less used for actual production or less practical use. We summarized the above four cases of intermediates temporarily as a special intermediate, if the special intermediate application is enlarge, we will adjust it according to the actual situation to change its "identity."
Special Intermediates
Special Intermediates,Tofisopam Intermediates,Amisulpride Intermediates,Antithrombotic/Blood thinners
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