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Does anyone recognize this leaf issue?

I recently increased CO2 to 800 ppm. I've used much higher levels in the past, but this time, an apparent magnesium deficiency developed almost immediately. My first theory was the increased transpiration caused the plant to pull up a nutrient that blocked the magnesium. But magnesium is...

I'm sure someone has asked this question before but I can't find the thread. I've found research (this for example: https://horttech.ashspublications.org/content/8/4/495.short) that shows that using pots that are too small hurts plant health (depending on the plant). But I have not found...

Does anyone have any insights or references related to impact of the relative length of the veg period on the final $/sqft of a harvest? For instance, suppose the harvest cycle for a particular strain lasts 12 weeks, and the recommended veg period were 4 weeks. I could reduced the veg period...

As the length of the flowering period increases, the high gets less cerebral and becomes more of a body high. If you believe that is true, then what mechanism is causing that? For instance, I've heard the explanation that as the flowering period increases in length, the THC:CBD ratio decreases...

Would anyone mind sharing experiences they have had with trying to either reduce the length of their harvest cycle or increase yields by increasing light intensity? The reason I ask is that we are designing an experiment where we increase yields or decrease harvest time with increased light...

I often hear from growers that if a grow room becomes too small or too large climate control becomes less efficient. This is a separate issue from the potential cost of a pest or mold outbreak increases with room size. For instance, one grower told me that when the room gets relatively small...

A plant can increase 2 or 3 times in size during the flowering period. But does that multiple depend on the amount of time the flower stays in veg? For instance, imagine the genetics is the same, and you keep the strain in veg for 5 weeks. After you switch it to flower for 10 weeks and it...