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Different strains may have slightly different requirements but they're all cannabis so a standard nutrient mix should cover what the plants need. Part of what you're seeing is the change in VPD. If EC is rising, I'd add back a bit of RO. Re. light levels - increased light will tend to...

Not seeing anything that looks like too much light but it's hard to say from the pictures. When posting photos, it's helpful to show a picture of the entire grow environment as well as a large portion of the plant. Closeups can be helpful step back a bit. Re the EVO 4 - can you send the link...

Those are nice looking plants. Let's make them big, nice looking plants! Not heat stress. LED's get warm but they don't give off heat the way HPS does. At 1100µmol, you'll kill a seedling. Check the manufacturer's recommendations and/or if you tell me the make and model of the light, I can...

Gotta love PG&E but, in their defense, the CA government has control over a lot of what PG&E does. I'm in Orange County so I get to pay ~50¢ per KwH in that evening price band. It's brutal. Even though the cost of electricity is very high, the value of the increase in crop size will probably...

You have had a nutrient imbalance for some time. Conditions in your grow have changed because 73° and 50% ≠ VPD of 1.9 VPD of 1.9 is tough on a plant. That's ~35% more water going through the plant than at 1.5 so there's lots of opportunity for a Ca deficit. I wouldn't try to correct that by...

Mg isn't radioactive unstable but my recollection is that pure magnesium will catch "combust easily". IIRC, when I was in high school, it was stored in oil but that was a bit over half a century ago so take that for what it's worth (I graduated from high school in 1972). [time passes] Just...

That looks to be a fox tailed and bleached bud. Re. changing light levels? Could be. Post pictures of the grow as well as pictures of the other colas. If that's the only bud that's been impacted and if that one is markedly closer to the light, there may be no reason to change light levels. On...

I found detailed information at this product page. The spectrum appears to have a fair amount of blue based on the spectrum chart. Looking at the chart, I see almost a "dual spike" of red and blue. My preference is for a higher % of red and less blue but there's a reason why people who design...

Artillery and tanks had white phosphorus (Willie Pete) will burn but the primary use was for smoke/marking rounds. Magnesium is really unstable. Further upthread was a comment about green tipped rounds. Ours were red tipped. "green garbage cans" were Soviet rounds.

I'll toss these in the mix. One of them is the paper by Saloner, Sacks, and Bernstein but the others are "new".

Love the big tent! I grow in a 2' x 4' so I'd get lost in a tent that size. And there's a chair in it—why not?! :-) Your plants look great. Keep up the good work. I'm a hydro grower so I can't offer any help in that area other to say that it is often an issue, based on my reading grow...

F. Mitchell Westmoreland is the name on his thesis (attached). The basics are important ("don't fuck it up") and will get about 75% of the way there. The other 25% comes from turning up the dimmer switch. :-) Attached are a copy of Chandra and what I refer to as "the Frontiers" paper. One...

Agreed. That's a great looking grow!

At 31°C and 80%RH, VPD is 0.6. That temperature is high enough that photosynthesis is starting to drop (per the graphic from Chandra) and that VPD is so low that water uptake, which is responsible for ~90% of the amount of nutrients that are taken up, will plummet. If the plant is subjected to...

I'm (re)reading Westmoreland's thesis and, in the section of phasic temperature change he mentions the difference in the number of colas between the plants grown at low temps at the outset and plants that were grown in higher temps. The temps were 18.5, 22, and 26.5. My grows are at high temps...

At 30 days, cannabis has almost matured its ability to process light (via photosynthesis). 18" and 40% is quite low but "observe growth" is the most important thing. A meter tells you how much light is falling on your plant but only your plant will tell you how much light it can use. I use an...

If you give a cannabis plant too much light, it will let you know. When I increase light levels, I'll turn up the dimmer a bit and then check the plant 30 minutes later. If the leaves are curling, I'll turn the dimmer back down or raise the light an inch or two. If everything's looking good...

Screenshot of your tent volume and the capacity of the 4" fan. Your tent is 54 cubic feet and the fan will move 165 cubic feet per minute. On a setting of 4/10, the fan will move 66 cubic feet so you'll be replacing the air in the tent in just under 60 seconds. If you want to change the...

I wish I could walk you through it but my tent is down for the summer. Best advice I can give is to call AC Infinity tech support and get them to walk you through it. I'm in a 2' x 4' tent so I just use their 4" inline fan. Running it at 4/10 gives me good air exchange (the air in the tent is...

Looking good!