Anti-season vegetables pay attention to what?
When planting off-season vegetables, not only plastic facilities, greenhouses, and other hardware facilities are to be put in place, but fertilization technology is also crucial. After practice, the key points of the off-season vegetable fertilization technology are introduced in a targeted manner: Determine the amount of economic fertilizer. To determine the amount of fertilizer to meet the demand of vegetables, it should be calculated according to the level of output and soil fertility. For example, if the soil nutrient supply of nitrogen, phosphorus, and potassium can meet the needs of vegetables, in order to ensure the intensity of fertilizer supply, the amount of vegetables to be delivered is 20 % to 40% of the amount of fertilizer. At present, under the level of fertility, nitrogen control, phosphorus reduction and potassium stabilization should be adopted, and targeted fertilizer application should be the principle of fertilization. Chlorine-based fertilizers should not be used, and volatile nitrogen fertilizers should not be used. When determining the fertilization, the length of the vegetable growth period and the harvested parts should be taken into consideration. For vegetables with a short growing period or harvested with roots, stems and leaves, 1/2 to 1/3 of nitrogen fertilizer, all of phosphorus, potassium, and trace fertilizers can be used as base fertilizers, and other nitrogen fertilizers can be used as top dressings for growing seasons. Application. For fruits and vegetables, 1/3 nitrogen fertilizer, 2/3 phosphorus potassium fertilizer and all micro-fertilizers can be used as basal fertilizers, while other nitrogen fertilizers, phosphorus and potassium fertilizers can be used as top-dressing fertilizers. If the salt content of the plot is between 0.2% and 0.3%, it is not appropriate to use chemical fertilizer as base fertilizer. Re-apply organic fertilizer and deeply plough the soil every year. The selected good quality organic manure was applied to the basal fertilizer for about 1 month before the cover shed, and the application amount was generally 1 to 1.5 times that of Datian, ie 3000 to 10,000 kg per mu, and was deep-plowed year by year to thicken the tillage layer. Soil and fertilizer blending to improve the physical and chemical properties of the soil. In order to prevent ammonia and nitrous acid gas poisoning, the application of organic fertilizer to maturity, especially chicken manure, requires a high degree of maturity and early application. It is strictly forbidden to pile up in the shed for a long time. Organic fertilizers can be applied in combination with inorganic fertilizers. It is more economical to use part of inorganic fertilizers for foliar application. In greenhouses, how to determine the appropriate irrigation time, irrigation temperature, irrigation volume and irrigation method is the key to achieve reasonable irrigation. Greenhouse irrigation water, the water temperature is maintained at 20 ~ 25 °C is appropriate, more than 28 °C will damage the vegetable roots, causing greenhouse vegetable diseases. Effectively solve the salt damage. For the land where salt has occurred, it can be solved by applying organic fertilizers such as cabbage, spinach, pumpkin, celery, broccoli and other salt-tolerant vegetables. Changing soil to remove salt or water is also a very effective method. Sunlight greenhouses and plastic greenhouses often suffer from leaching due to excessive fertilization and no natural precipitation, causing the concentration of salt in the soil to rise continuously. Standardized fertilization is an effective way to prevent the accumulation of greenhouse salt. Face Masks,Medical Facemask,Filtration Isolation Medical Facemasks,Anto-Bacteria Face Masks Zhende Medical Co.,Ltd , https://www.zdmedicalproduct.com