Ok, so it seems that
a lot has gone wrong in the past few days.
On one hand, the air-cooled hood has dropped temperatures significantly, and my babies are happy for that. On the other hand, however, it seems that I have completely misdiagnosed some problems. I mentioned 3 days ago that there were some burn spots from additives that had been left on the leaves when I put them back under the light after watering. Turns out that these blotches in the center of the leaves were related to the slight dark bluish/grey spotting I had noticed on the edges on one of the leaf sets on one of the other plants. Even after a day under the new air-cooled hood, on the worse plant, the spots expanded eventually covering almost 2/3 of the leaf drying it up completely with a very dark greenish color. (Note: I am slightly colorblind, so it's sometimes tough for me to discern between dark greys/blues/greens, so if coloring is a very acurate indicator of a spicific dificiency, don't take my word on the color 100%.) From the "Marijana Plant Problems and Cures" sticky in the general thread, the problem looks very similar to, if not exactly, like a
phosphorus deficiency. The spotting on the other plant looks like it's getting worse, and a spot is now visible on a third plant.
pH of my soil reads
6.8. The problem isn't heat or pH, so I have to assume that it is a nutrient deficiency. I haven't used any nutes to this point, only Rhizotonic, Cannazyme, and Superthrive and I am in the FoxFarm soil, which I had thought would hold me over nutrient-wise for a good three weeks. Since I couldn't think of a single other thing to do, I watered with a half-strength solution of BioVega, my vegging nutrient. I have bone meal available as a phosphorus supplement, but it isn't water soluble, so I think my best (and quickest) option is to go with the BioVega. It's balanced, and I'd think that if this is the specific nutrient deficency that I think it is, it isn't unlikely that other deficiencies will follow...
Watering Mix:
8mL/gal BioVega
6mL/gal Rhizotonic
1drop/gal Superthrive
pH of watering mix was
6.57
pH of runoff was
6.67
Pictures attached are of the problem plants. First two are of the one plant with the less advanced spotting, the second two are of the plant that is developing sever problems. I've spent a long time in the Plant Problems thread, and this is what I've come up with...sure hope things turn around!