"Chunchun autumn frozen method" produced in vegetable greenhouses

Vegetables have their optimum temperature and limit temperature at different growth periods. If Other growth and development conditions are suitable, the most suitable temperature conditions can make the vegetables in the best growth state and obtain higher production efficiency. The weather in winter is changing and the temperature is unstable, causing temperature fluctuations in the greenhouse. The use of other heat sources ensures the optimum temperature, but it is not used because of its high production costs. Utilizing the plasticity of vegetable adaptability to temperature, adopting the method of â€œspring chill and thawing and freezingâ€ to create the best temperature environment and improve the antifreeze ability of vegetables is a feasible way to increase production. Are introduced as follows: First, the autumn freeze 1, timing: before and after the frost. When the temperature in the greenhouse falls to vegetables, it is not suitable, but it can be implemented when it can adapt. 2. Purpose: To exercise the ability of vegetables to adapt to lower temperatures, so that they can withstand the sudden cold falling in the future and safely overwinter. 3, practice: In the temperature range of adaptation, as much as possible to reduce the temperature of the greenhouse. According to the changes in the outside temperature, the film release period will be appropriately delayed, the film will be released, the film will be removed every morning, the film will be released in the evening, and the cover period will also be postponed. The cover period will be released every morning and the lid will be covered overnight. 4. Effect: The ability of vegetables to resist low temperature is significantly improved. Take cucumber as an example, the lowest temperature it can adapt to is 8Â°C. Usually it can't resist the temperature lower than 8Â°C, but it can tolerate below 8Â°C to 5Â°C after autumn freezing. Even a short time near 0 Â°C low temperature. 5. Matters needing attention: (1) Grasp the timing of the implementation and the time of film release; (2) In the initial stage of film laying, it is not completely closed, ventilation is maintained, and the temperature of the canopy is adjusted flexibly to prevent freezing damage. Second, the Spring Festival 1, timing: the beginning of the spring to "five." After some time at this time the outside temperature but the climate is unstable. 2. Purpose: To reduce the difference between the temperature environment in the winter shed and the external environment in the spring, so that the tender tissue of the vegetables can adapt to the film removal better and faster. 3, practice: 1 is not in a hurry to uncover the film and large ventilation, 2 "five." After gradually increase the amount of ventilation until all the film removed. 4, the effect: vegetables do not flash seedlings, growth without fluctuations. 5, note: 1 film removal should be gradual, can not be rushed. 2 Ventilation should be timely to prevent the greenhouse temperature from burning too high. Greenhouse vegetables managed in accordance with the principle of "Spring and Autumn and Autumn Frozen" will not cause freezing damage in winter, and will not sprout in spring and grow stably. In short, â€œChunqiuqiu frozen methodâ€ is an important way to increase the stability of vegetable production in greenhouses.
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Posted on May 01, 2019