Carbon Dioxide Concentration, Photosynthesis, and …
Rates of carbon dioxide supplementation are dependent on the crop response and economics. Flower and vegetable growers may take somewhat different approaches. In general, carbon dioxide supplementation of 1,000 ppm during the day when vents are closed is recommended. At 10% vent opening the CO2 supplementation can be shut off or reduced to 400600 ppm. In order to improve economic efficiency, CO2 levels can be set depending on light levels. The following is a recommended strategy for vegetable growers. On sunny days when the vents are closed, supplement with 1,000 ppm CO2 while on cloudy days when the light level is below 40 watts/m2 supplement with only 400 ppm CO2. However most flower growers will supplement with 1,000 ppm regardless of light levels. The environment computer can be set to adjust the CO2 level depending on the light measured but once the vents open beyond 10% or the second stage of exhaust fans becomes operational, the focus is to maintain a CO2 level in the crop canopy at 400 ppm.
The carbon dioxide molecule is linear and centrosymmetric
This is because carbon dioxide s
used the process and so, the more there is, the more chance of the
reaction taking place, and so, the more frequently it does take place.
Today, most growers monitor and control the greenhouse environment with sensors linked to a central computer to allow integration of the different environmental factors. A carbon dioxide controller, usually an infrared gas analyser (IRGA) is used to monitor and maintain the minimum and maximum CO2 level in the greenhouse. Usually a single IRGA is used per operation. Multiple readings within individual compartments or from different zones can be obtained by using a scanner or a multiplexer. The IRGA unit can be stand-alone or, as in most cases, connected to the environment control computer. In the latter case the environment control computer is used to control the CO2 level, through integration with light levels, stage of ventilation, and wind speed. Infra red gas analysers require routine calibration to insure accurate measurement of the CO2 levels.
Carbon dioxide An increase in the ..
There are four things that are required by the plant before it can carry out photosynthesis, they are light, chlorophyll, carbon dioxide and water ....
Carbon Dioxide and Photosynthesis Essay - 783 Words
Place solution and leaves back into the cups and place
under the light source and record times of when each circle
floats to the top.
Independent variable: Amount of bicarbonate in solution (Carbon dioxide).
Dependent: Reaction rate of Photosynthesis
Control: Spinach leaves; # of circles; size of discs
The leaves within the baking soda solution raised at a much higher rate than that of the normal water solution cup.
Carbon Dioxide and Photosynthesis
Therefore, if there were to be an increase of the concentration of carbon dioxide, the rate of photosynthesis theoretically will increase as well, with the assumption of an unlimited water supply.
If the amount of carbon dioxide is increased, the rate of photosynthesis will increase as well.
If the concentration of carbon dioxide is increased, the photosynthesis reaction rate will be unaffected
and carbon dioxide removed by photosynthesis ..
Under moderate temperature conditions when C3 plants have sufficient water, the supply of carbon dioxide is abundant and photorespiration is not a problem. The CO2 concentration of the atmosphere as of 2004 was about 380 ppm and this CO2 freely diffuses through the stomata of leaves and across the membranes of the while water diffuses out through the stomata. But during hot and dry conditions, the stomata close to prevent excessive water loss and the continuing fixation of carbon in the dramatically reduces the relative concentration of CO2. When it reaches a critical level of about 50 ppm the rubisco stops fixing CO2 and begins to fix O2 instead. Even though the detoured process feeds some PGA back into the cycle, the photorespiration process causes rubisco to operate at only about 25% of its optimal rate.
Chemistry for Biologists: Photosynthesis
Through reading various books and web pages it was made clear that carbon dioxide is definitely one of the raw materials needed for photosynthesis, but I wanted to see whether this is actually true and if carbon dioxide is taken away completely will the plant photosynthesize at all.