Hydroponics & CO2
Roland.Gronroos at sgen.slu.se
Mon Jan 4 05:33:58 EST 1993
In article <1993Jan03.232313.1313548 at zeus.calpoly.edu>,
mffowler at zeus.calpoly.edu (Michael Francis Fowler) wrote:
> Oh...Since I am here- I am curious what the effects
> of supplementing Carbon Dioxide to my greenhouse
> crop of flowers and vegetables. Any suggestions
> about this is also greatly appreciated.
Carbon dioxide (CO2) fertilization is a common way to increase growth in
I have tested the effect of CO2 on pine seedlings (Pinus sylvestris) there
was an increase in growth (DW increase) up to about 3500 ppm.
The following examples is cited from a brochure from (snail mail adress)
AGA GAS AB, S-17282 Sundbyberg, SWEDEN. They sell gas and equipment for CO2
Plant ppm CO2 comment
Tomato 1000-1500 faster growth, earlier and larger yield (25-30%)
Cucumber 1000-1500 faster growth, earlier and larger yield (25-30%)
Roses 1000 Larger yield, better stem and flower quality
Saintpaulia 1000-2000 Faster growth (24-62%), 1-2 weeks earlier flowering
, more flowers
Atmosperic concentration is 300-400 ppm CO2.
In a closed greenhouse will the CO2 concentration drop to about 100-150 ppm
this retards growth.
Effects on man can be observed at 20000-30000 ppm CO2 after some hours
exposure. The authorities in Sweden regard 5000 ppm as safe for workers
spending all their working-hours in greenhouse.
Swedish University of Agricultural Sciences
Dr. Roland Gronroos Tele: +46 18 67 32 37
Department of Forest Genetics Fax: +46 18 67 32 79
Box 7027 E-mail/Datorpost:
S-750 07 Uppsala Roland.Gronroos at sgen.slu.se
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