ISHS Acta Horticulturae 534: International Conference and British-Israeli Workshop on Greenhouse Techniques towards the 3rd Millennium
RECUPERATION OF «BIOCO2» TO INCREASE GREENHOUSE PRODUCTION |
| Authors: | L. Urban, L. Barthélémy, P. Bearez, P. Pyrrha, A. Jaffrin |
| Keywords: | Biogas, carbon dioxide, greenhouse, photo-inhibition, photosynthesis, rose, stomata, leaf temperature |
| Abstract:
Organic wastes from urban activities and the food industry represent a major source of pollution. Anaerobic fermentation produces biogas, mainly a mixture of methane and CO2. Most often biogas is burned. While in countries of Northern Europe energy is generally recuperated for heating purposes, the gages resulting from combustion of biogas are almost always released into the atmosphere. On the other hand, high CO2 concentrations are desirable in greenhouse production. While there is a general consensus that yield increases expected from extra CO2 in the earth atmosphere might not be observed, there are good reasons to believe that there are no limiting factors in soilless greenhouse conditions such as water and mineral availability, sink activity and absence of excessive UV-B. Conversely, rose greenhouses could be used for depollution purposes. But when temperatures are high, windows of greenhouses are kept wide open to allow the renewal of inside air by cooler outside air. Under such circumstances, the fixed on injected CO2 ratio cannot be very high. Present observations on rose leaf photosynthesis tend to indicate that rose plants can stand temperatures well above 35°C and do even better at higher CO2 concentrations, provided that water and mineral supply is effectively non-limiting. These observations suggest that roses may be an ideal crop for assimilating "bioCO2". | |
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