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How to fertilize greenhouse vegetables
Greenhouse vegetable fertilization has the same features as common vegetable fields and Daejeon, but the technical requirements are relatively strict. Some farmers’ friends have improperly applied fertilizers, causing vegetables to aggravate diseases and suffer loss of production. According to Sun Shuyun, an extension researcher at the Vegetable Technology Promotion Station in Tianjin, it is important to pay attention to the application of basal fertilizer when applying fertilizer to plastic greenhouses. The basal fertilizer is mainly organic fertilizer, and the basal fertilizer per acre (fully composted and composted) is 4000-5000 kg. If an insufficiently cooked organic fertilizer is applied, the heat generated during the continuous fermentation process will cause the crop to burn roots, and the pathogenic eggs in the manure will be easily brought into the shed. Manure will cause harmful gases in the fermentation process to harm the vegetables. In addition, in order to increase the content of nitrogen, phosphorus, potassium and trace elements in soil, diammonium phosphate, superphosphate, potassium sulfate and ternary compound fertilizer can be used as base fertilizer. After the basal fertilizer is applied, it must be turned into the soil and blended with the soil. Second, topdressing and basal fertilizer are equally important. The time and frequency of top dressing depends on the type of vegetables and other conditions. The number of top dressings in fruit and vegetables is more than that of leafy vegetables. Usually, the top dressing is 3-4 times, and the cucumber is 5-10 times. After dressing, the top dressing can be properly topdressed, especially after the fruit starts to expand, and then top dressing is applied to promote early maturation and high yield. Appropriate topdressing to increase total production. In top dressing categories, chemical fertilizers generally use urea or ammonium sulfate, organic fertilizers use decomposed manure or hemp sauce powder, bean cake powder and so on. In addition to nitrogen, phosphorus, potassium and trace elements with the application. At present, the promotion of formula fertilization and balanced fertilization in the cultivation of nuisanceless vegetables is based on the nutritional characteristics of vegetables, the characteristics of soil fertilization, and the effect of fertilizer production, and quantification of fertilization. In the fertilization, we must adhere to the principles of fertilizing organic fertilizers and chemical fertilizers, so that the supply of nitrogen, phosphorus and potassium nutrients must be balanced, and a large number of elements and trace elements must be balanced. In addition, the top dressing in the greenhouse can be properly used foliar spray method, such as urea, potassium dihydrogen phosphate and calcium nitrate, borax, zinc and other trace elements, generally sprayed after 24 hours, 80% will be absorbed.