Outside temperatures are low, and sometimes lighting conditions are not good. To ensure the greenhouse temperature, many vegetable farmers are not willing to ventilate. After the unveiling of the haystacks, it will be used to supplement carbon dioxide inside the shed, promote photosynthesis, discharge harmful gases accumulated in the shed, and be ventilated and ventilated under the premise of ensuring no cooling. The length of ventilation time can be determined by the temperature conditions in the booth.

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