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12 days, @ 100ppm. Then I stopped. 4 weeks later, looks promising.

Doubled E.C.

FLIR might provide insight into the heat distribution? more visual than an IR gun. The key point. VPD is only one factor. But try and get it in the zone I think It’s been helpful to me, combines transpiration energy (cooling power, evaporation + photosynthesis ? ), humidity & temperature...

So My thinking is. Under LED, where IR doesn’t add 2deg, either ; Above 26 LST is bad, or; Ambient/LST differential below 2 is bad. Because, photosynthesis is compromised at the hot location, not because of the light. In my case, low EC, pumped water through plant, drinking loads, but tip...

I guess the vpd information and calculating it told me how I could back the “pressure” off the plants while I figured out a better E.C. Or what the problem was. The FLIR showed up hot grow points, very close to ambient. I’m not sure how vpd relates to plant parts, but it’s calculated higher when...

Great thanks, theres a bit of an ambient temperature gradient too. And humidity. 28.8 measured top canopy level. FLIR calcs from manual circles in the scene. They’re not quite growing right. Thin, salted tips.

Salmonetin compiled a great selection of reference. Thanks again.

Great idea, I’ll try it. I’ll also try pics of a few different environments. Bottom leaves freezing, hot tops... what does that mean? In dwc it is low nutrient? the difference in leaf surface indicates low vpd in lower canopy leaves, high at top. More food?

May I ask enviro temp/hum? pls.

Where are you finding your e.c. Sweet spot?

The measured ambient air temperature at canopy height was measured with a thermister @ 28.8 deg C. FLIR is measuring leaf temperature, I was concerned with high temp tips, I think transpiration was being inhibited at those points?

Anything red or white is exceeding recommended vpd.

Wondering people’s thoughts on what information a FLIR image can give in relation to humidity, light, EC or temperature adjustments. This photo @ ambient 28.8, 65% humidity, led600w ec.7 dwc After this photo I raised the light a little and turned off a couple of fans, slowed extractor to let...

Ambient 28.8c Rh 65. Led. 600. Thoughts from experience on vpd? Just had to flush after a dehumidifier mishap. EC .7 Dried tooo much.

It’s got a baffle, credit to the Thingiverse designer, not mine. I put on each 5mm air line close to pump. Stopped the buckets singing the air pumps tune.

Resin 3D print Airline silencers, they work a treat.

Check microbe diversity is high. Sponge filter.

Poor results with cyco & low humidity. Excellent results Canna Aqua. No additives.

You may be feeding dissolved carbon to citric acid loving Cyanobacteria. They’ll eat it up in about two hours and dump enough bicarbonate to fizz.