Indoor Yield-O-Rama

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).

Cypher 4 - Co2 and Venting
Correlation Significance
C=CO2 NOT used, no active venting
-.082 .311
D=CO2 NOT used, constant venting
.145 .073
E=CO2 NOT used, automatic or timed venting
.013 .875
F=CO2 NOT used, manual venting
-.226** .005
I=CO2 Generator, flame
.036 .658
O=CO2 Generator, chemical, auto vent
-.063 .437
S=CO2 Tank, manual release
.117 .150
U=CO2 Tank, flow ctrl, sol release
.131 .106
V=CO2 Tank, Flow ctrl, sol release, auto vent
.094 .246
_-Not Available
-.181* .025

** Correlation is significant at the 0.01 level
* Correlation is significant at the 0.05 level
Number of records=153



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