Switched out the silic rock for rhyno skin, the only reason I decided to do this is because I know rhyno skin is potassium silicate and wasn't sure of the silic rock, so I went with the extra available potassium.
It's insane how much these are lapping up the pk and the EC is not raising at all, at some point this week I will switch out the pk13/14 for some shogun 9/18 and run that to the end.
Smells really good and definitely not complaining about the led grow lights. Two are more than enough for this tent size and the plants are outgrowing the tent which I definitely didn't expect going into this considering the brand of the lights (they both draw 180w at peak so that would explain the lower than advertised PPFD measurements at max power)
Not going to back off on any PK until I start to see the run off EC rising, or I may keep the current PK profile and then switch when I see the run off EC going up and then assume that indicates the plant needs less P now so it's building up in the coco.
Not 100% sure but I am fairly certain the tall plant isn't white widow. The terpene profile and overall growth behaviour of the plant doesn't fit with what I expect from a white widow plant. The short stocky one is definitely white widow....peppery, earthy, green and musky scent, whereas the tall one is sweet candy, slight fruits with a bit of pine.
Shouldn't be long now before it's finished and we can know for sure.
@Herikus, thanks! Can't wait to get them rolled up. Tall plant looks real frosty, it's a shame it's not gonna go full length but should still be mighty fine.
@Psilocubensis, sulphuric acid is used simply to lower the pH of the nutrient solution, the tap water here is 8.4pH so after mixing usually it's above 7pH before regulation with sulphuric acid.
The citric acid is used to lower the pH further so a pH range is covered over a few hours as the pH naturally rises from the break down and plant uptake of the citric acid. But citric acid has another benefit, if you look up the Krebs Cycle you will find it's actually called the citric acid cycle too, and it's all to do with cell energy production and electron carrying etc throughout the plant. I wouldn't grow a plant without it