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:

1. To determine the amount of economic fertilizer, select the appropriate fertilizer species, determine the appropriate fertilization period, fertilization methods and other content. 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 in general and volatile nitrogen fertilizers should not be used. Nitrates should be controlled as much as possible. 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-l/3 nitrogen fertilizer, all phosphorus, potassium, and trace fertilizers can be used as base fertilizers, and other nitrogen fertilizers can be used as top-dressing fertilizers 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. Such as salt content in O. 2% to 0.3%, it is not appropriate to use chemical fertilizer as a base fertilizer.

2. 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 l-1.5 times that of Datian, ie 3,000-10,000 kilograms per 667 square meters, and deep plowing was applied year by year. Layer, do the soil compatibility, 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 in the shed for a long time. 'Organic fertilizers can be used in combination with inorganic fertilizers. If a part of inorganic fertilizer is extracted and sprayed, it is more economical.

3. For different soils, choose a better irrigation method. Different vegetables have different requirements for soil moisture, and the roots of shallow vegetables such as cucumbers, peppers, cauliflower, celery, lettuce, etc.: like moist soil, the amount and frequency of irrigation should be appropriately increased, roots deeper into the soil such as watermelon, melon, loofah, Tomatoes, zucchini, etc. are more resistant to drought, and irrigation and irrigation times should be minimized. Different growth periods have different requirements for soil moisture, and the water absorption capacity of the root system at the seedling stage is weak. It is required that the soil moisture is higher and the water seedlings are needed to promote rooting at the height of the rooting stage; during the prosperous period, the wet vegetables must be frequently watered and the top soil layer must be relatively The humidity is kept at about 85%; for drought-tolerant vegetables, it is not appropriate to supply too much water during this period.

In plastic 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.

4. Effectively solve the salt damage. For the land where the salt has occurred, it can be solved by selecting the vegetables, vegetables such as cabbage, spinach, squash, celery, broccoli and other organic fertilizers. Changing soil to remove salt or water is also a very effective method.

Sunlight greenhouses and plastic greenhouses are often over-fertilized and no natural precipitation is showered, causing the concentration of salt in the soil to rise. Standardized fertilization is an effective way to prevent the accumulation of greenhouse salt.

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