When the grasshopper is pulled for 1 hour, the small mouth is released for 7-8 minutes. Generally, the air outlet is about 5 centimeters wide. Its purpose is to put in carbon dioxide, strengthen the photosynthesis of vegetables, discharge moisture and harmful gases. When the temperature of the greenhouse rises to the upper limit of the high temperature needed for the vegetables, one more wind is used to gradually reduce the temperature to a suitable range for vegetable growth. At noon time (12 am to 14 pm), the photosynthesis of vegetables is in a “midday break†state. To reduce their respiratory consumption, the temperature of the greenhouse can be reduced by about 2°C as appropriate. In addition, in the greenhouse, as the two gables of the greenhouse met the heat of light absorption, the temperatures at the two sides of the shed increased slowly, thus making the temperature at the two ends of the shed lower than the temperature in the middle of the greenhouse. When the wind is released, the vegetable grower should open the outlet at the two ends of the greenhouse slightly. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone
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The greenhouses in winter will not release air within an hour after the insulation or grass bedding is opened in the morning. Because the temperature in winter is low, after covering the straw curtain in the evening, the vegetables in the greenhouse will stop photosynthesis and release only a large amount of carbon dioxide through the respiration. At the same time, the microorganisms in the soil will release carbon dioxide by decomposing organic matter. After the night, the carbon dioxide content accumulated in the shed increases significantly. Higher than the outside world's carbon dioxide content. When the straw curtain is opened in the early morning of the next morning, sunlight begins to irradiate and the vegetables begin photosynthesis, which requires a large amount of carbon dioxide. At this time, the concentration is high enough to give vegetables sufficient raw materials to convert it into nutrients after photosynthesis. Vegetables. In the one hour before the release of the wind, the organic matter accumulated by the plants through photosynthesis will be several times the normal amount, which is conducive to the increase of vegetable yield.