Planting off-season vegetables, not only plastic greenhouses, solar greenhouses and other hardware facilities should be in place, fertilization technology is also critical. After practice, the key points of anti-season vegetable fertilization technology are now introduced in a targeted manner:
1. To determine the amount of economic fertilization, select suitable fertilizer varieties, determine the appropriate fertilization period, fertilization methods and so on. According to the premise of determining the amount of fertilizer to meet the demand of vegetables, it should be calculated according to the yield level and soil fertility level. For example, if the supply of nitrogen, phosphorus and potassium nutrients in the soil can meet the needs of vegetables, in order to ensure the fertilization intensity, according to the amount of vegetables carried out 20 % to 40% of the amount of fertilizer applied. At present fertility level should be controlled by nitrogen, phosphorus, potassium, and targeted application of micro-fertilizer as the principle of fertilization.
It is generally not advisable to use chlorine-based fertilizers. It is not advisable to use volatile nitrogen fertilizers and try to control nitrate-nitrogen fertilizers. When determining fertilization, the length of the vegetable growth period and the harvesting site should be considered. Generally, vegetables with short growth period or roots, stems and leaves are harvested. 1/2~l/3 of nitrogen fertilizer, all phosphorus, potassium and micro-fertilizer can be used as base fertilizer, and other nitrogen fertilizers can be used for topdressing in the growth stage. Apply. For melons and fruits, 1/3 nitrogen fertilizer, 2/3 phosphorus potassium fertilizer and all micro-fertilizer can be used as base fertilizer, and other nitrogen fertilizer and phosphorus potassium fertilizer are applied as top dressings. If the salt content is in O. 2% to 0.3%, it is not appropriate to apply fertilizer as a base fertilizer.
2. Re-apply organic fertilizer and deep-plow the soil in a year-round manner. The fertilized high-quality organic fertilizer is selected for the base fertilizer application about 1 month before the shed, and the application amount is generally l~1.5 times that of the field, that is, 3000-10000 kg per 667 square meters, and deep ploughing year by year, thickening cultivation Layers, to achieve soil and fertilizer, improve the physical and chemical properties of the soil.
In order to prevent poisoning of ammonia and nitrous acid gas, the application of organic fertilizer should be decomposed, especially chicken manure, requiring high degree of maturity and early application. It is strictly forbidden to use long-term piles in the shed. It can be combined with inorganic fertilizers. If a part of inorganic fertilizer is extracted and sprayed, it is more economical.
3. For better soils, choose a better irrigation method. Different vegetables have different requirements on soil moisture. The roots are shallow vegetables such as cucumber, pepper, broccoli, celery, lettuce, etc.: like moist soil, the amount and frequency of irrigation are increased appropriately, and the roots are deep into the soil such as watermelon, melon, loofah, Tomato and zucchini have strong drought tolerance, and the amount of irrigation and the number of irrigation should be minimized. Different growth periods have different requirements on soil moisture. The roots have weak water absorption capacity at seedling stage. It is required to have higher soil moisture. The roots should be controlled by water and seedlings to promote roots. At the peak of the period, the wet vegetables should be watered and the topsoil should be relatively The humidity is maintained at about 85%; for drought-tolerant vegetables, it is not advisable to supply too much water during this period.
In the plastic greenhouse, how to determine the appropriate irrigation period, irrigation temperature, irrigation amount and irrigation method is the key to achieve reasonable irrigation. For greenhouse irrigation water, the water temperature should be maintained at 20 ~ 25 ° C, more than 28 ° C will damage the vegetable roots, causing greenhouse vegetable diseases.
4. Practically solve the salt damage. For plots where salt damage has occurred, it can be solved by selecting organic vegetables such as cabbage, spinach, pumpkin, celery, broccoli and other salt-tolerant vegetables and vegetables. It is also a very effective method to remove soil or remove salt.
In greenhouses and plastic greenhouses, the concentration of salt in the soil is constantly rising due to excessive fertilization and no natural precipitation. Standardized fertilization is an effective way to prevent the accumulation of salt in the greenhouse.
Real Wood Ceiling Fan Without Light
The Ceiling Fan Light is beautiful in appearance, equipped with durable fan blades and lighting of different colors and styles, and has functions such as lighting, cooling, and decoration.There are much more Led Ceiling Fan styles in our website,such as DC Ceiling Fan ,Iron ceiling fan,Wooden Blades Ceiling Fan With Bulbs,Retractable Ceiling Fan Light,Simple Ceiling Fan Lamp,and best decoration Plywood Led Ceiling Fan.And there are more items are not showing on the website,please feel free to contact us directly for more information.
Big Ceiling Fan,Large Ceiling Fan,Ceiling Fans With Remote Control,Large Industrial LED Ceiling Fan,Industrial Ceiling Fan Light
JIANGMEN ESCLIGHTING TECHNOLOGY LIMITED , https://www.esclightingfan.com