First, use ammonium bicarbonate and ammonium sulfate in winter greenhouses. After the application of ammonium bicarbonate, many ammonia emissions will be announced, and the vegetables will grow into radon. The ammonium sulfate is a physiological acid fertilizer that will add acidity to the soil after application. Ammonium bicarbonate is a fast-acting fertilizer for top-dressing vegetables in winter greenhouses. Even at a soil temperature of 5°C, it can be transformed and used by crops. However, deep application should be paid attention to when applying it. Generally, it is opened 8 to 10 cm away from the roots of vegetables. The ditch with a depth of centimeters, after the application of the earth, can be used to cover 10% to 30%.
Second, the application of diammonium phosphate in winter. Vegetables demand a lot of nitrogen and potassium, and less phosphorus is needed. For example, the ratio of NPK required by eggplant is 3:1:4, cucumber is 3:1:10, tomato is 6:1:12, and so on. Diammonium phosphate contains 18% nitrogen and 46% phosphorus. It does not contain potassium. Therefore, it is not suitable to use more diammonium phosphate in greenhouses. In addition, it should be noted that diammonium phosphate must not be mixed with alkaline fertilizers such as grass ash to avoid ammonia evaporation and ammonia damage.
Third, scattered fertilizer application of phosphate. Phosphorus is easily absorbed and solidified by the soil and loses its fertilizer effect. Phosphorus fertilizers are therefore suitable for cooperation with basal fertilizers or are applied to the roots of densely populated soils in the early stage of vegetables. Generally, 8 cm deep trenches are planted in transplant lines, and 4 to 5 cm of soil is thrown into phosphorus fertilizers. Transplanting vegetables in shallow trenches shortens the distance between phosphate fertilizers and crop roots to compensate for the low mobility of phosphorus.
Fourth, top-dressing potassium fertilizer. Vegetables generally require more potassium before and after flowering, and will gradually decrease in the future. The use of potash fertilizer at the later stage will reduce the use of potassium and waste fertilizer.
Fifth, urea topsoil shallow Shi. The development stage of vegetable crops has more demand for fertilizers and waters. When dressing, open 8~10 cm deep ditch. After application, cover the soil tightly. The vegetable with a large row spacing can be deep-opened with a hole, and sprinkle water on the basis of the greenhouse temperature for 5~7 days to allow sufficient time for ammoniating in the soil. To facilitate the use of absorption. During the growing period of the vegetables, the leaves can be sprayed with 0.3% urea solution once every 7 days, and 75-100 kg of fertilizer solution per acre can be sprayed for 2 or 3 times.
6. Apply fertilizer under drought conditions. Greenhouse vegetables are hi-water crops. When the soil is dry, it becomes fat. Not only can the fertilizer effect not be fully exerted, but also the concentration of soil solution can suddenly increase, making it easier for the vegetables to burn. Therefore, the fertilizer on the shed must be combined with irrigation, and the fertilizer should be developed on the ditch, and the fertilizer should be buried in the future, or the water should be top-dressed and the small-water irrigation combined.
An active substance is the main active ingredient in a drug. Take a simple aspirin for example. Acetyl salicylic acid is synthesized through chemical process and purified to a specified purity. The synthesis of acetyl salicylic acid is made by adding various excipients, such as fillers, adhesives, disintegrating agents, etc., and then pressing it into tablets. The production of apis is generally either pure chemical synthesis, biological fermentation, or semi-synthesis, with biological fermentation followed by extraction followed by synthesis. Not all pharmaceutical enterprises make API by themselves, and many manufacturers do not have the scale to produce API. Even if there is large-scale production, the cost of production may be much higher than that of procurement. Therefore, most manufacturers buy bulk drugs, and then make preparations, so that the production of drugs can be completed without a very large scale. At present, China and India have become the two largest API producers in the world. Many European and American pharmaceutical companies, even some of their own original drugs, will give up the production of API as the patent expires and the market matures, and turn to purchase apis from China and India,API production generally go through laboratory, generated through laboratory bottle container canister, taking after successful, pilot magnification, which is to enlarge the quantity of the production, then no problem tends to be faced with a lot of small scale experiment, a very simple example, the heating process, due to the relatively small amount in the laboratory, uneven heating cases is less, But if it is scaled up to a few tons of pot, at this time the heating may be not hot in this place, where the paste pot, at this time you need to stir, but the speed of mixing is appropriate, this process needs to calculate or grope. Finally from the pilot test, and then to the formal production, the volume of further amplification, and will face a lot of new problems. Therefore, although some drugs are generic, the research and development of the whole process from small test, pilot test to the final mass production is indispensable, so even generic drugs have very high research and development costs.
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