The counter-season cultivation of greenhouses is common in modern agriculture. The lack of carbon dioxide has a great impact on the yield of vegetables. Appropriate and appropriate application of CO2 in greenhouses has significantly improved the growth, yield and quality of vegetable crops. And improve. The application of carbon dioxide in greenhouses requires the use of carbon dioxide detectors for effective detection and analysis, and for the effective analysis of changes in greenhouse co2, so as to develop reasonable fertilizer measures.
CO2 detector detection found that, in the absence of CO2 supplementation, the law of change is roughly the same as the outside world. In winter, greenhouses for insulation are often in a confined state. The growth of tomatoes in greenhouses is strong. CO2 fertilization is performed. The maximum concentration of CO2 in greenhouses is 1250 mg Pkg. Under good weather conditions, photosynthesis of tomato consumes a large amount of CO2, and the concentration of CO2 decreases sharply. Even in the case of CO2 supplementation, a lower concentration of 200 mg Pkg has appeared.
There is also a clear daily change in the CO2 concentration in the greenhouse. The general rule is that before sunrise, the concentration of CO2 in the greenhouse gradually accumulates, and the concentration reaches the maximum before and after sunrise. After sunrise, the tomato undergoes photosynthesis and gradually consumes CO2 in the greenhouse. From 10 am to 2 pm, the CO2 concentration dropped to its lowest point, and around 4 pm, it gradually increased with the decrease of photosynthesis, and CO2 concentration gradually accumulated at night.
Through the CO2 detector, it was found that the economical and effective concentration of CO2 in the growth and yield of vegetable crops was 600-1000 mg Pkg. Above this concentration, the yield can be increased, but it is economically uneconomical. Therefore, the upper limit of concentration of CO2 emitted from soilless cultivation tomatoes in modern greenhouses should be 1000mgPkg. When the light intensity is strong, the concentration should be higher; on cloudy days or weak light, the concentration should be reduced.
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