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The second is the application time, which can be started 0.5 hours after the curtain is opened every day, so that the greenhouse maintains a high carbon dioxide concentration within 1-3 hours. If ventilation is required, the application should be stopped 0.5 hours prior to ventilation.
The third is to adjust the application concentration according to the specific weather conditions. Set the concentration higher on sunny days, 1000-1500 mg / kg; lower on cloudy days, 500 ~ 1000 mg / kg. Low temperature, when the light is not strong, it is generally not applied to avoid side effects.
Fourth, carbon dioxide fertilization should be matched with other measures. When applying carbon dioxide gas fertilizer, the room temperature should be increased by 2 °C ~ 3 °C during the daytime, and the temperature should be lowered by 1 °C ~ 2 °C at night to prevent the lengthening of the soil and air humidity, so as to enhance the photosynthesis and increase the application of phosphorus. Potash.
Fifth, the application of carbon dioxide should not stop suddenly. In order to stop the application of carbon dioxide gas fertilizer in production, the application concentration should be reduced day by day in advance, until it stops, otherwise the plant may suddenly appear premature aging.
Greenhouse grape carbon dioxide precautions
One is the period of application. The application of carbon dioxide in the greenhouse is mainly carried out before and after flowering and in the growth period of young fruit, especially in the period of young fruit expansion, which should be continuously applied for 30 to 40 days.
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