Hi Peter, Thanks for these comments and link: > Please check the number 10% CO2 with a reliable source, I think it is off by > a factor of 100, and I cannot find any references on the net that come > anywhere close to it.
Cannot remember the first time we got that figure for a project in Tasmania, but I obtained it myself in direct communication with Massey University in New Zealand, later,around 1985-6. We were at that time, looking at using the exhaust gas in those plastic tunnels they put over winter row crops, but the client never took his demonstration project to that next level. I remember the guy wanted to do trials to see if increased CO2 from a cheap source, could be introduced via the growing medium, rather than the atmospherics. Temperature was not discussed, as the CO2 had to be first cooled before going through a compressor. Not sure if he was looking at root or foliage growth back at that time. The projects stick out in my memory, as not many seek to utilise gasified electrical generation with agriculturally linked activities. >Normal air contains about 300ppm (0.03%) CO2. General consensus is optimum >levels for many plants is 2x-3x higher (600ppm - 1000ppm or 0.06% to 0.10%). >If you increase >temperature and provide sufficient light and nutrients, >large improvements in growth are possible. Plants which are classified as C4 >photosynthesis (corn for example) do not respond as well. > > For more info, this link lists some reference studies : > > http://www.co2science.org/subject/g/summaries/temp+co2ag.php Will certainly read this over the holidays, and thanks for the trouble of digging these links out, as I'm sure it will have use to someone growing stuff. Doug Williams, Fluidyne. _______________________________________________ The Gasification list has moved to [email protected] - please update your email contacts to reflect the change. Please visit http://info.bioenergylists.org for more news on the list move. Thank you, Gasification Administrator
