Affected by the low temperature in winter, some fertilizers are more suitable for application, while some fertilizers are not suitable. It is suitable to apply ammonium bicarbonate in winter. The temperature is low and ammonium bicarbonate is not easy to volatile and decompose, which is beneficial to improve fertilizer utilization. Ammonium bicarbonate is an ammonium nitrogen fertilizer, which can be directly absorbed and used by crops after being applied to the soil. The fertilizer is fast and belongs to a typical "quick fertilizer". , Can provide nitrogen nutrition for crops in time. According to experiments, topdressing ammonium bicarbonate in winter wheat fields can increase the fertilizer efficiency by 1 to 1.5 times in the hot season. Do not apply urea Urea belongs to acylammonium nitrogen fertilizer. After it is applied to the soil, it cannot be directly absorbed and utilized by crops. It needs to be converted into ammonium nitrogen under the action of urease secreted by urea bacteria in the soil to be absorbed by the roots. The rate of urea conversion mainly depends on the soil temperature. If all the urea applied to the soil is converted into ammonium nitrogen, it will take 7 to 10 days at a ground temperature of 10°C, 4 to 5 days at 20°C, and only 2 to 3 days at 30°C. It can be seen that topdressing crops in winter or early spring, if urea is applied, will often affect crop growth due to slow fertilizer effects. Increased application of phosphorus and zinc fertilizers The absorption of phosphorus and zinc by crops is significantly affected by temperature and light. Low temperature in winter and insufficient light can easily induce phosphorus and zinc deficiency in over-wintering crops. Phosphate and zinc fertilizers should be appropriately increased. In addition, phosphorus can enhance the cold resistance of plants, and increased application of phosphorus fertilizer is beneficial to prevent and control crop freezing damage. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone API Powder (Active Pharmaceutical Ingredient) Active Pharmaceutical Ingredients refer to the raw materials used in the production of various preparations. They are the effective ingredients in the preparations. They are various powders, crystals, extracts, etc., prepared by chemical synthesis, plant extraction or biotechnology, but Substances that the patient cannot take directly.
According to its source,Active Pharmaceutical Ingredients are divided into two categories: synthetic chemical 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 (extremely elements), such as aluminum hydroxide and magnesium trisilicate used to treat gastric and duodenal ulcers; organic synthetic drugs are mainly composed of basic organic chemical raw materials, through a series of organic Drugs made by chemical reactions (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 made by microbial fermentation, which belongs to the category of biochemistry.In recent years, many semisynthetic antibiotics are the combination of biosynthesis and chemosynthesis.Among APIs, organic synthetic drugs account for the largest proportion in variety, yield and output value, which is the main pillar of chemical pharmaceutical industry.The quality of API determines the quality of preparation, so its quality standards are very strict. All countries in the world have formulated strict national pharmacopoeia standards and quality control methods for its widely used API
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