The repeated planting rate of greenhouse vegetables is high, the yield is high, and the amount of fertilizer is large. The fertilizer has a great influence on the yield, quality and soil properties of vegetables. The application of base fertilizer can be said to be the most basic link in fertilization. The application of base fertilizer to vegetable crops Growth and development is quite critical. Therefore, the base fertilizer must be applied reasonably, and the following problems should be noted when applying the base fertilizer: To determine the amount of fertilizer applied to the greenhouse, it is necessary to comprehensively consider the amount of fertilizer required for vegetables and the size of soil fertility. Generally 30% of total nitrogen fertilizer, 80% of phosphate fertilizer, and 50% of potassium fertilizer are used as base fertilizer, and biological fertilizer and micro-fertilizer need to be applied once. For example, the yield of tomato in autumn is generally 8000-9000 kg. In this production range, 4.4 kg of nitrogen, 1.1 kg of phosphorus pentoxide and 4.8 kg of potassium oxide should be absorbed for each 1000 kg of tomato produced. The ratio of nitrogen, phosphorus and potassium is 1:0.25. : 1.1, more calcium, boron, etc. are needed. Among them, the high-phosphorus fertilizer should be selected as the base fertilizer, and the low-phosphorus fertilizer should be used as the top dressing. The amount of base fertilizer is preferably 40-50 kg, the ratio of nitrogen, phosphorus and potassium is 1:1:0.75; the application rate is 75-85 kg, and the ratio of nitrogen, phosphorus and potassium is 1:0.2:0.85. Organic fertilizer (including farmyard manure, manure and cake fertilizer) is most suitable for base fertilizer application. For old greenhouses, bio-organic fertilizer should be used as base fertilizer and appropriate application should be applied. To maintain soil fertility and organic matter in the shed without reducing or slightly increasing, organic fertilizer must be added to the greenhouse soil. According to the change of soil organic matter in greenhouse, please apply the fertilizer. Please remember that the ratio of organic nitrogen to inorganic nitrogen is 1:0.4~1, the highest yield. The organic matter in the greenhouse should be kept above 2% to ensure high yield. The fertilizer is not less than 2000 kg/mu, and the organic matter content is recommended to be 30%. 3. Determine the application method of the base fertilizer according to the weather and growth characteristics The application of base fertilizer should be based on large-volume crude organic fertilizer, such as decomposed soil and fertilizer, manure, etc. It is recommended to use 6-8 cubic meters per acre to increase soil organic matter and carbon material, and at the same time with a small amount of high quality bio-organic fertilizer. (General dosage: 100-150 kg) and sustained-release potassium sulfate compound fertilizer 75-100 kg. Controlled release fertilizer is used to regulate the release rate of nitrogen fertilizer in the base fertilizer, to avoid the occurrence of high temperature and prevent root diseases. After fruit setting, the whole element fertilizer containing nitrogen, phosphorus and potassium should be applied with water. Tetanus Toxoid Vaccine,Toxoid Vaccine,Hep B Immune Globulin,Immunoglobulin Injections FOSHAN PHARMA CO., LTD. , https://www.full-pharma.com
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