As the main varieties of pollution-free vegetable production in our county in recent years, broccoli production has attracted more and more attention. Improve the quality of cauliflower, comply with the strict requirements of market standardization on the quality of cauliflower, prevention and control due to improper fertilization measures, resulting in cauliflower, nitrate, nitrite and cadmium, chromium and other heavy metals exceed the standard, product quality can not meet the requirements. Therefore, in order to make broccoli high quality and high yield, the balance of formula fertilization, give full play to the economic and effective fertilizer effect, overcome the habits of fertilization caused by high and unstable production of cauliflower. This set of formula fertilization technology is formulated. First, the principle of fertilization. The so-called broccoli formula fertilization technology is a fertilization technique in the cultivation of cauliflower, from the traditional experience of fertilization method to scientific quantification. According to the law of fertilizer demand of broccoli crops, soil fertilizer performance and fertilizer effect before the crop sowing put forward the reasonable ratio of organic fertilizer, NPK fertilizer and various trace fertilizer, the amount and the corresponding fertilization techniques. 1. Fertilizer requirements: Due to the long growing season, broccoli requires large amounts of nutrients. Nitrogen and potassium are the most needed, and more phosphorus is needed during the formation of flower bulbs. In addition, the demand for boron, magnesium, calcium, and molybdenum is also large. According to the research, cauliflower produces about 7.70-10.80 kilograms of pure nitrogen, 2.10-3.20 kilograms of phosphorus pentoxide, and 9.20-2.20 kilograms of potassium oxide per 1000 kilograms of flower bulbs. Before bud emergence, the absorption of nutrients is low, and the demand for nutrients after budding is gradually increased. It is necessary to have the most nutrients and the fastest absorption rate until the flower buds are inflated and flourishing. Therefore, in the process of flower bud differentiation and flower bulb development, phosphorus must be ensured. The full supply of potassium nutrition. 2. Requirements for soil: The soil grown by broccoli is rich in organic matter, with a ph value of 5.50-6.60. Sandy loam and loam soil with strong water retention and fertility retention capacity are the most suitable soils. The soil moisture requirement is 70%-80%, and the air relative humidity is 80-90%. 3. Fertilization techniques: 1 Basal fertilizer: The growth period of early-maturing varieties is short and rapid, and the nutrient requirements in the early stage are high. The organic manure is dominated by livestock and manure, and NPK fertilizer is applied; the middle and late-maturing varieties are dominated by compost and manure. With phosphorus and potassium fertilizers. The dosage per acre is 1000-2000 kg for human and animal manure or 3000-5000 kg for manure and 20-25 kg for 45% compound fertilizer. 2 Top-dressing: seedling stage combined with watering for the first time to apply 15 kg/mu of ammonium sulfate, 20 days after the second top-dressing, apply rot or dried chicken manure 400-500 kg/mu and watering, bud diameter of 2-3 When the first 3 centimeters top dressing, apply 4-25 percent compound fertilizer 20-25 kg. In the later stage, depending on the specific conditions, 0.2% potassium dihydrogen phosphate and 0.20% borax were sprayed on the foliage. Second, the principle of fertilization 1. Mainly organic fertilizer, supplemented by chemical fertilizer: The single application of chemical fertilizer in broccoli field is higher than the residual nitrate in organic fertilizer. Therefore, the pollution-free broccoli production fertilizer must be dominated by organic fertilizer, supplemented by mineral chemical fertilizers and trace element fertilizers, and vigorously strengthen formula fertilization. 2. Limited use of nitrogen fertilizers: Nitrogen fertilizers are used in cauliflower production and are necessary throughout the growing season. When the nitrogen fertilizer is sufficient, the plants grow lushly, the leaves are dark green and high in yield. If there is a lack of nitrogen fertilizer, the stems and leaves of the plants will be narrow and the color of the leaves will be yellow, and the yield and quality will be reduced. However, over-application of nitrogen fertilizer can also lead to a dramatic increase in nitrate content in the vegetables, which is prone to pests and diseases. 3, the implementation of balanced fertilization: in cauliflower cultivation, different sowing date cauliflower different elements of the need to focus on different, often nitrogen fertilizer for leaf fertilizer, phosphate fertilizer for fruit, potassium fertilizer as a root fertilizer, if a simple application of a fertilizer, will Cauliflower grows badly as a whole. 4. Prohibit the listing of broccoli immediately after applying nitrogen fertilizer: After the last application of nitrogen fertilizer to cauliflower, there must be a safe interval until the product is harvested and marketed. It should be listed on the 8th day after the last application of nitrogen fertilizer. 5. It is strongly advocated to apply top dressings outside the roots. Plants mainly rely on roots to absorb nutrients, and leaves and tender stems can also directly absorb nutrients from the solution sprayed on the surface. It should be strongly advocated. Urea and superphosphate and potassium dihydrogen phosphate, as well as trace elements, are suitable as top-dressing fertilizers. 6, according to the physiological characteristics of cauliflower to determine the fertilization period. Cauliflower needs less nutrients at the seedling stage, and more nutrients are needed during vigorous growth and product formation. Organic fertilizers and phosphate fertilizers are generally used as basal fertilizers before broccoli sowing and planting. Available nitrogen and potassium fertilizers can be top-dressed in the middle of broccoli growth. The frequency of topdressing can be determined based on the growth and development of broccoli. Usually, 1-2 times of fat are collected every 15-20 days. Third, broccoli uses fertilizer types. In the production of non-polluting broccoli, the fertilizers allowed for cauliflower are basically divided into four categories: (1) Organic fertilizer: including human and animal manure, compost, manure, biogas fertilizer, green manure, crop straw, mud fertilizer, cake fertilizer, grass ash, slag, etc. Except for grass ash and slag, the rest should be thoroughly cooked before application. (After high-temperature fermentation, organic manure can kill 100% of pathogenic microorganisms such as E. coli, and can reduce the volume and weight by 1/2-1/3, which is convenient for field transportation. In addition, the organic manure is not cooked after it is applied to the field. Fermentation, easy to burn the roots.) (2) Biological bacterial fertilizer: including humic acid fertilizers, rhizobia fertilizers, phosphorus bacteria fertilizers, composite microbial fertilizers. (3) Inorganic fertilizers: such as ammonium sulfate, urea, superphosphate, potassium sulfate, etc., which contain neither chlorine nor nitrate nitrogen, nitrogen fertilizers, and broccoli fertilizers produced locally. (4) Trace Element Fertilizers: Fertilizers mainly formulated with trace elements such as copper, iron, boron, zinc, molybdenum, and beneficial elements. The general principle of broccoli formula fertilization is based on the need for fertilization during growth, what nutrients are missing, what fertilizers are applied; how much is lacking, and how much fertiliser is applied; broccoli formula fertilization techniques should be promoted throughout the country and broccoli-specific fertilizers should be promoted. This will not only harmonize the supply and demand of nutrients between soil and crops, reduce the waste caused by excessive nitrogen fertilization, but also avoid phosphorus enrichment and excessive potassium consumption in the soil, which will help maintain soil nutrient balance and improve soil fertility. , laying the foundation for sustainable development of cauliflower production. Bambermycin Antibiotics,Bambermycin Granular,Bambermycin Powder,Bambermycin Animal Feed Shandong Shengli Bioengineering Co., Ltd , https://www.shenglipharm.com