Hey Kriegs, just checking in to see how your grow's going, and for the most part all looks well.
I do have a question, though - I know you understand chemistry and plant biology 10X more then I do (and that's being generous), but I still feel like the empirical evidence of your grow would indicate that pH'ing your water would be beneficial.
I (admittedly) don't understand the science, but it seems like your grow is going through lots of nute deficiencies/lockouts, which (to me, anyways) would indicate a pH problem.
Anyways, that was a long-winded intro of me suggesting that perhaps an experiment that you could run would be to pH your water for some plants and give other plants your 8.0pH water, and see what happens?
Just my $.02, for what it's worth.
Thanks, Bob...I appreciate the input.
Actually, I have been checking into my pH values - curiosity more than anything, but also cuz I get worried about how an isolated pot of soil holds up over the long, biologically active run of a grow. The 8.0 value I mentioned is what comes right out of the tap. After sitting out for at least 24 hours, it drops to 6.8 - 7.0 (a relatively recent discovery..). So even though it's treated with a chloramine process (which is supposed to be stable, and is why I thought it stayed at 8.0), it obviously still de-gasses something to cause the pH to drop. So, haha on me for thinking it was going in at 8.0..
The 30-10-10 I gave her the other day was right at 6.5. I've also been checking runoff, too -- dead on at 6.5.
My big girl is suffering a straight-up N deficiency. I've seen this before in a lot of other plants (non-MJ). She was perfect until she got a couple weeks into stretch, then she just exhausted the soil. My mistake, I think, was making a straight translation of last years' grow (very nute-sensitive sativas..) to this years (bubblelicious -- a hybrid with some unknown lineage, and much hungrier). Last year, I burned 'em up with too many nutes, and swung too conservative this year in response.
Part of the recalcitrance of the N deficiency in the big girl is just how N comes to us, the growers. As urea or ammonia -- both which have to be broken down first. A little bit of pure nitrate would fix that in a jiff.
The superskunks, I've surmised, just really didn't like starting in pre-ferted soil. The ones I re-started as 12/12-from-seed did their first week in a very cool 30-40-30 mix of seed starter/MG organic/perlite and they
loved it. Now, they're in a ~50/50ish MG organic/MG pre-fert mix with some added perlite and mushroom compost, and they seem to really love that, too. No issues, and much more aggressive this go-round.
So, yeah, I still think my calculus holds up: being that slightly alkaline water is no match for the extensive acid buffering in potting soils. But, I'm checking into all possibilities and trying other approaches.
Cheers, bro.. thanks for checking in and raising the issue. I'm always happy to re-evaluate my assumptions...