Gorilla Glue Autos, Three plants in tent. 3rd week of flowering
Looking at the leaves, wondering what may be the cause of the brown tips (nutrient deficiency or overfed?)
Using Foxfarm nutrients. Grow Light, VIPARSPECTRA Newest Pro Series P2500 LED Grow Light. Plants are roughly 16 inches or so from light (perhaps to close?)
Also, having issues with gnats (had a tomato plant in tent but removed it). Been using Diatomaceous Earth on top of soil. and spreading around floor a little. Have a few fans running as well. Plan on Friday night to scoop off the layer of Diatomaceous and water and then add some back (?)
Any comments welcome! - Leaves and gnats have me concerned during flowering.
Thanks!
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I also think it looks a lot like potassium deficiency. I wrote an article on that and also fungus gnats. 1. https://www.mrgrowit.com/post/potassium-deficiency-in-cannabis-plants 2. https://www.mrgrowit.com/post/fungus-gnats-on-cannabis-plants
A ppm and ph of medium would help. Being in flower that is common sign of potassium deficiency. I don't know the specs on your light but 16 inch seems a little close, you may want to find a grow chart for it. As for knats I use yellow sticky paper every grow, start to finish. That way when knats show up they "stick" around but aren't multiplying.