In a modern greenhouse cultivated in the off-season, CO2 scarcity is a major factor affecting vegetable production. The timely and appropriate application of CO2 in greenhouses has significantly improved the growth, yield and quality of vegetable crops. The carbon dioxide detector attempts to analyze the changes in CO2 in the greenhouse and summarizes a set of applicable technologies for the application of CO2 gas fertilizers in greenhouses.
In autumn, due to the tomato's vegetative growth period, the photosynthetic intensity is low, and CO2 consumption is low. Therefore, the greenhouse CO2 concentration in the greenhouse during the early growth period of tomato is high, and the release effect is not large at this time. In summer, due to the large window opening rate and large ventilation and external ventilation, no The need to release CO2; in winter due to the greenhouse is often in a closed state, and the exchange of air flow with the outside world is small, while the crop grows vigorously, CO2 concentration often occurs at very low values, and therefore must add CO2. The period of CO2 replenishment in the greenhouse should be carried out shortly after sunrise to maintain a high level of CO2 in the greenhouse, and CO2 will cease to be released after 4:00 PM, at which time CO2 will gradually accumulate. The short-term application of CO2 is not effective. The practice requires that CO2 be added for 3 to 8 hours throughout the winter and spring season. At noon during ventilation, the CO2 supplementation is generally stopped after stable ventilation.
The carbon dioxide detector monitors the carbon dioxide content in the greenhouse and finds that the application of CO2 has a lot to do with crop varieties, light intensity, and temperature. It has been reported that the starch in tomato leaves accumulates with the increase of CO2 concentration; when the CO2 is increased to above 1500 mg Pkg, the accumulated starch in tomato leaves can cause chlorophyll damage and affect photosynthesis. Appropriate CO2 concentration control of tomato is about 1000mgPkg, the concentration is too high, the potential for increasing yield is not great. It is currently considered that the economically effective CO2 concentration for the growth and yield of vegetable crops is 600 to 1000 mg Pkg. Above this concentration, it can increase production, 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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