Correct ventilation technology of greenhouse

The greenhouse was closed for an hour after the grass curtain was opened in the morning.

Because after covering the grass curtain at night, the vegetables in the greenhouse stop photosynthesis and release a large amount of carbon dioxide only by respiration. At the same time, the microbial decomposition of organic matter in the soil will also release carbon dioxide. The content of carbon dioxide accumulated in the greenhouse increased significantly after one night, which is much higher than that in the external atmosphere. So there was no air for an hour after the grass curtain was opened the next morning. After receiving the light, the vegetables began to photosynthesis, fully absorbing carbon dioxide in the greenhouse and converting it into organic matter stored in the fruit. 70% of the photosynthates in a day are synthesized in the morning, accounting for 80% of the photosynthates. Within an hour before the release, the organic matter accumulated by plants through photosynthesis will be several times higher than usual, and the yield of vegetables will be greatly increased.

So in the morning the sun rises, open the grass curtain, wait an hour later and then take a small breath for 7-8 minutes, and then stop the air, and wait for the temperature in the shed to rise to a certain extent, depending on the actual situation. The main purpose of small mouth ventilation is to cool down, the second is to drain moisture, and the third is to remove harmful gases. Correct ventilation management is an effective method for high yield in greenhouse, which can greatly increase the yield of vegetables and melons.