The production of vegetables in greenhouses is basically in a closed condition. The carbon dioxide content in the shed is low, and photosynthesis is inhibited. Therefore, carbon dioxide must be added. Tests have shown that cucumbers can increase production of carbon dioxide by more than 35%. Leaf vegetables are better to use carbon dioxide in the early growth period, and fruits and vegetables should be applied from the initial flowering stage. Generally, the carbon dioxide topdressing is carried out at 9 to 11 o'clock in the sunny morning, and ammonium bicarbonate + sulfuric acid, or baking soda + sulfuric acid can be used to produce carbon dioxide after mixing, so that the carbon dioxide content in the shed reaches 1000 mg/kg. Do not ventilate when applying CO2, and ventilate it after 1.5 to 2 hours of application. If the application of solid carbon dioxide gas fertilizer, per acre need to apply 40 kilograms, can be directly applied or buried on the surface, valid for up to 45 days.
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