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Entry Date
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Nick Name
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Location
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Thursday, July 04, 2019
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Matt D.
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Connecticut
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Entry 130 of 210 |
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Sunny Day PAR Readings
The photosynthetic rate can be limited by the ppm of CO2 that is present (assuming temperature is optimum). Note: Ps = Photosynthesis
For example setting the theoretical Ps rate at 100% under ideal conditions (temperature being consistent, and the amount of carbon dioxide and light intensity changing) presented here is a summary of when CO2 concentration increases so does the light intensity to maximize Ps activity…
400ppm CO2: Ps peaks at around 20% of the theoretical maximum @ 450 umoles/m2/s
800ppm CO2: Ps peaks at around 60% of the theoretical maximum @ 850 umoles/m2/s
1400 ppm CO2: Ps peaks at around 95% of the theoretical maximum @ 1050 umoles/m2/s
*However, levels of CO2 above 1200ppm are considered to offer little benefit overall despite what this data may suggest related to relative Ps %
Link to Data (see Figure 5 on page 8): http://fluence.science/wp-content/uploads/2016/09/High-PPFD-Cultivation-Guide-9.27.16.pdf
Even on what looks like a fully sunny day there can be continually change the exact amount of PAR, so median readings are shown in the images. There is a large difference to the cloudy day, and while the plant can not necessarily use all of this energy it is interesting seeing the difference the weather and 6mil plastic can make.
Indoor Structure = PAR 1464
Outdoor = PAR 1831
The Indoor plant is receiving 80% of the PAR the outdoor plant is. However, both readings indicate an excessive amount of light energy which is more than the plant can use/process.
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