Speaking of greenhouses, some vegetable farmers may feel that this is nothing to say, and every day they let go of the wind and are too familiar with it. Instead of opening the straw curtain in the morning, open the air outlet to release moisture from the shed, and then close the air outlet after a while. Keep the shed temperature. However, during the interview, the reporter discovered that the farmers who have such ideas always control the environment of the sheds, and the vegetable production is not very high. It can be seen that the scientific and rational release of air has a great influence on the growth and yield of vegetables. Then, how can we promote the high yield of vegetables through ventilation? The reporter summarized the following contents for reference by farmers.
In the morning, the sun rises, and the straw curtain is opened. After an hour, the small mouth releases air for 7-8 minutes, and then the air is stopped.
After the curtains are opened, they will not be released within one hour. This involves the problem of carbon dioxide regulation. After covering the grass curtain at night, the vegetables in the greenhouse stopped photosynthesis and only a large amount of carbon dioxide was released through respiration. At the same time, the microorganisms in the soil decomposed the organic matter and released carbon dioxide. After the night, the carbon dioxide accumulated in the shed increased significantly, much higher than the outside atmosphere. Carbon dioxide content. Therefore, the next morning, when the straw was opened, the wind was not released and the vegetables began to undergo photosynthesis after receiving the light, fully absorbing the carbon dioxide in the shed and converting it into organic substances stored in the fruit. Studies have shown that: Photosynthesis efficiency of plants is high in the morning, and 70%-80% of photosynthetic products are synthesized in the morning. In the one hour before the release of the air, the organic matter accumulated by plants through photosynthesis will be several times the normal amount, and the yield of vegetables will certainly be greatly increased.
There are four main purposes of small mouth breathing: one is cooling, the other is evacuation, the third is to eliminate harmful gases, and the fourth is to add carbon dioxide. After the greenhouse is sealed overnight, the release of sulfur-containing gas from plastic films, slings, etc., and the production of ammonia and other harmful gases from the fermentation of organic fertilizers in the soil are eliminated in a timely manner. After one hour of photosynthesis, the carbon dioxide in the shed was gradually depleted, and it was necessary to supplement carbon dioxide by releasing air.
In addition, the release of air should also pay attention to, to adapt to the weather conditions, when the outside temperature is low, can be appropriate to postpone the release of air or not release the main greenhouse insulation, in order to avoid sudden drop in temperature, causing freezing damage.
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