Analysis of Venting and Co2 Use

The only specific venting condition showing a statistically significant effect on crop yield is manual venting, which appears to reduce yield. A couple of other interesting things should be noted. First, even if CO2 is not used and there is no active venting, this does not produce a statistically significant reduction in crop yield. Secondly, when CO2 is not used but constant venting occurs, the positive correlation with crop yield nearly approaches statistical significance, and this correlation (+0.145) is at least as strong as any of the correlations where CO2 is used in some fashion. This may suggest that supplemental CO2 may be a waste of money and effort, and that a one-time investment in a small, low-wattage exhaust fan may be just as productive as long as it is run fairly constantly (at least during the light phase).