First, fertilizer and water management. Cauliflower is a kind of fertilizer and fertilizer-resistant vegetable crop. The demand for fertilizer during the bulbous expansion period is relatively large, accounting for more than 70% of the entire growth period. When the leaves grow out of the flower balls, topdressing should be repeated and appropriate phosphorus and potassium fertilizers should be added. In combination with watering, topdressing nitrogen, phosphorus, and potassium per acre (select low-nitrogen, high-phosphorus, high-potassium compound fertilizers) TWN 20 kg, and then pour small water once every 5 to 7 days so as to avoid drought causing scattered flowers. ball. In addition, the use of top-dressing can greatly improve the quality of cauliflower, cauliflower is relatively sensitive to boron, copper and other trace elements, can be combined with disease prevention and pest control spraying potassium dihydrogen phosphate, green leaf treasure, borax and other highly efficient liquid fertilizer 2 to 3 times.
Second, beam shading. Cauliflower grows under the strong light to make the flower ball yellow, in order to ensure that the flower ball is delicate and white, and to improve the commercial quality, the flower ball should be shaded during production. When the diameter of the flower bulb reaches about 10 cm, the old leaves of the base are removed and the flower bulbs are covered to prevent the high temperature from causing the loose flower bulbs or the flower buds to be drawn. It is also possible to tie up 4 to 5 large leaves close to the flower ball to cover the flower ball and avoid direct sunlight, which affects the quality and appearance.
Third, disease prevention and pest control. Diseases mainly include viral diseases, downy mildew, black rot, and soft rot. Virus disease can be sprayed with 20% of virus A wettable powder 500 to 600 times; downy mildew can be sprayed with 68.75% silver silver; for soft rot and black rot 72% of streptomycin sulfate can be used 72% Liquid spray control. Insect pests mainly include aphids, cabbage caterpillars, diamondback moth, beet armyworm and Spodoptera litura. The aphids can be sprayed with 2.5% imidacloprid 1000-1500 times, and the rapeseed, diamondback moth, beet armyworm, Spodoptera litura, etc. can be sprayed with a 1000-fold solution of cypermethrin EC.
Fourth, timely harvest. It usually takes about 25 days from the appearance of flower bulbs to harvesting. The premature harvesting will affect the yield. If it is too late, it will cause loose flower balls and affect the quality and the commodity. In the production, the methods of phased harvesting should be used to sell in stages. Generally, the harvest is harvested when the curd is fully grown, the surface is round and the edges are not scattered, and harvested once every 2 to 3 days. 3 leaflets to protect the flower ball.
What is the API?
Active Pharmaceutical Ingredient (API) refers to the raw drug used in the production of various Pharmaceutical products. It is the Active Ingredient in a Pharmaceutical product, powder, crystal, extract, etc., prepared by chemical synthesis, plant extraction, or biotechnology, and used for medicinal purposes, but cannot be directly administered by patients.
So what is the use of an API?
Active substance (API) is fully defined in ICH Q7A as any substance or mixture of substances intended for use in the manufacture of pharmaceutical products and, when used in pharmaceutical products, as an active ingredient of pharmaceutical products. Such substances have pharmacological activities or other direct effects in the diagnosis, treatment, symptom relief, management or prevention of disease, or can affect the function or structure of the body. The active ingredient of a medicine. Only when an API is processed into a pharmaceutical preparation can it become a medicine for clinical application.
According to its source, apis are divided into chemical synthetic drugs and natural chemical drugs.
Chemical synthetic drugs can be divided into inorganic synthetic drugs and organic synthetic drugs. Inorganic synthetic drugs are inorganic compounds (very few are elements), such as aluminum hydroxide and magnesium trisilicate for the treatment of gastric and duodenal ulcer, etc. Organic synthetic drugs are mainly made of basic organic chemical raw materials, through a series of organic chemical reactions and drugs (such as aspirin, chloramphenicol, caffeine, etc.).
Natural chemical drugs can also be divided into biochemical drugs and phytochemical drugs according to their sources. Antibiotics are generally produced by microbial fermentation and belong to the category of biochemistry. In recent years, a variety of semi-synthetic antibiotics are the combination of biosynthesis and chemical synthesis products. Among apis, organic synthetic drugs account for the largest proportion of variety, yield and output value, which is the main pillar of chemical pharmaceutical industry. The quality of the API determines the quality of the preparation, so its quality standards are very strict. All countries in the world have formulated strict national pharmacopoeia standards and quality control methods for the widely used APIS.
Specific API after processing -- pharmaceutical preparations
The term API is used mainly in relation to the finished product. Mainly raw materials obtained by chemical processing means, supply raw materials for the production of finished drugs. For example, cefpirome sulfate for injection is a drug, then cefpirome sulfate is an API
alprazolam api powder,pregabalin api powder,buy api powder,api ingredients
Shaanxi YXchuang Biotechnology Co., Ltd , https://www.peptidenootropics.com