At present, it is a busy season for greenhouse vegetable production in the northern region. Vegetables, especially fruit and vegetables, have long growth periods and high yields. During the longer growing season, not only the atmospheric temperature outside the shed is low, but also ice, snow, and haze are frequent. These will change the supply of sunlight, temperature and moisture in the shed. Conditions, which affect the growth of vegetables, increase the difficulty of cultivation and management. In order to maintain a steady and steady growth of vegetables in the shed, water and fertilizer management is particularly important, in addition to regulating and maintaining suitable temperatures. To do this, make the following prompt: Pay attention to the application of organic fertilizer in the rapid development of greenhouse vegetable cultivation area, many new vegetable fields should pay more attention to the application of organic fertilizer. Only a large amount of organic fertilizer is mixed into the soil to improve the root soil properties, and the structure is good. After buffering performance, it will be conducive to the extension of vegetable roots, increase the soil's water retention and fertilizer retention capacity, and reduce nutrient loss and increase caused by frequent irrigation. Fertilizer utilization. The amount of organic fertilizer applied can not be small, the general dosage is 5 to 10 square meters per mu. The types of organic fertilizers should also be emphasized. For example, common chicken manure contains large amounts of phosphorus and nitrogen nutrients, but the proportion of carbon and nitrogen is relatively narrow. Straw compost has a low content of nitrogen and phosphorus and a wide ratio of carbon and nitrogen. It can be used by mixing the two. Applying a large amount of mixed organic fertilizer can provide nutrients to the vegetables and improve the soil in an all-round and smooth manner. The effect will be more obvious. Water management See seedlings in the greenhouse Seedlings in winter greenhouses require seedlings. Drying of the topsoil can promote root barbling. Therefore, less irrigation is required, water control stabilizes the growth rate, and the seedlings are not leggy. If the weather is properly ventilated, the seedlings will be properly cultivated. Can cultivate strong seedlings. After the result period, irrigation is very important. Every irrigation time needs to look at the sky. No water is poured on cloudy days, and cold flow attacks no irrigation, because irrigation can significantly reduce soil temperature, affecting the growth of vegetables and the release of soil nutrients. Irrigation must be done before the sun comes out on the same day. The irrigation during the result period is generally synchronized with topdressing to achieve water and fertilizer integration. Base fertilizer top dressing with the application of base fertilizer should be deep. On the basis of organic fertilizer, appropriate amount of ternary compound fertilizer (about 30 kg/mu) is applied. The proportion of N, P, and K in the compound fertilizer should be moderate, and nitrogen fertilizer should not be outstanding. Even in the absence of organic fertilizer, do not choose high-nitrogen compound fertilizer because high nitrogen will not only make the seedlings less strong, but it may also cause tomato umbilicus. Rot and other symptoms. In addition to compound fertilizers, a single type of nitrogen fertilizer may be used to add calcium and potassium sulfate or potassium chloride. The slightly acidic soil area can use calcium magnesium phosphate fertilizer, which is better than other phosphate fertilizers. Fruit and vegetable collection period is long, you need to supplement the nutrients while harvesting, in order to meet the need for continuous flowering results. Therefore, topdressing is also very important. Topdressing should be based on the principle of a small number of times, mainly nitrogen and potassium fertilizers. Nitrogen does not exceed 5 kg at a time, and fertilizer and water are combined to achieve integration. During the top-dressing period, the first fruit was inflated and the fruit fertilizer was promoted, and the second and third fruit fruits were in the period of fruit enlargement. After entering the full fruit period, the ability of the roots to weaken and suck up fertilizers decreased, and nitrogen and potassium fertilizers could be applied to the soil. Can be used outside the fertilizer to spray potassium dihydrogen phosphate, calcium nitrate or calcium chloride, borax and other components of the water-soluble fertilizer. In order to protect the future strong plants, reduce the occurrence of physiological diseases, improve fruit quality. Supplementary trace elements in the high yield and greenhouse vegetable production in new vegetable fields should pay due attention to the supplementation of trace elements in fertilizers, because the demand for calcium, magnesium, boron and other nutrients in fruit and vegetables is relatively large, in addition to the common tomato "umbilical rot" In addition, the incidence of cracked fruit has become increasingly serious in recent years. Vegetables in plastic greenhouses are prone to fruit cracking, soft rot, and other physiological problems that affect the quality of the product. Therefore, the appropriate application of trace element fertilizers in the middle and late stages of vegetable growth is feasible. Nutrients mainly include calcium, boron, magnesium and zinc. According to the difference in the degree of nutrient use, different methods of top dressing or soil application are adopted. Fertilizer varieties can be selected as single or composite fertilizers. However, they should not be selected as full-size supplements. Such fertilizers are poorly targeted and the effect is not obvious. The dosage form can be liquid or solid. Delafloxacin Intermediate,Delafloxacin Api,Delafloxacin Abt-492,Delafloxacin Cas 247069-27-8 Shandong Bolode Bio-technology Co., Ltd. , https://www.bldpharma.com