I looked into that but this is more like part of the leaf is being eaten. There is no powdery residue or anything like that unless this is an early sign. This started in between the veins and the leaf dries out as these pop up.
That's why I abandon vpd in all honesty. Not risking mold, I've never noticed a big difference tracking and fighting with vpd. Sorry to side track, good luck! @Captspaulding has the knowledge ✌ he is legit
What is vpd?
I wouldn't even worry about it, vapor pressure deficit. It is the potential for air to accept moisture. It's advanced, if you get really good and bored check it out. But if you are not seasoned enough to realize when the correct vpd will cause mold issues. It could ruin your grow easily
Yeah man, dli, vpd and all of that stuff I don’t use. Only a ppfd meter when I’m laying out lights. I’m about keeping it simple.
Vapor-pressure deficit (VPD) is a calculated value in kPa (kilopascal) that is derived from temperature and humidity and other factors, such as leaf temperature. Some environment controllers can use it as a trigger. My controllers can do it, but I use temperature and humidity triggers, instead. Either provides about the same level of control. It's good to understand VPD, though, because it is an indicator of a plant's ability to transpire. A VPD close to 1.0 is best for young plants. As plants mature, a higher VPD is better, but seldom higher than about 1.4, IIRC without looking at a chart. VPD only matters when the light is on.
If you really want to dig into something you can learn, look into soil micro biology it's fantastic, also botany specifically annual flowers, it's all good stuff. It will really open your eyes. If your a youtube person look up dr. Elaine Ingram
Let me know how you like it!
