You're still limited by the sq. footage. 4x4 is 16 sq.ft. . Personally I achieve better yields with out a scrog, at least with the G-13 as there is not much branching and there is enough light penetration to get to the bottom of the plants.
ok cool. I assumed but also thought i may have read as well but can't back it up with anything that you gain some feet with scrolling/trelis.
I don't know, it's just what I read, most growers consistently got right around 45 g sq/ft. Then when I got my highest yield last time it worked out to 45, so I have reason to believe it. And the way I do it is to take most upper leaves off so it actually does become 3D, even bottom buds get thick. I got a lot less when I just left all the leaves on, got 80 grams a recent time I did it that way. I did put a stronger fan in the chamber recently too though, so that may be what was keeping yields down before. Weird though because the plants grew vigorously, just didn't yield much. I was using PC fans with carbon filter pad over them and it was just inadequate. Changed to bathroom fans and apparently it helped.
This is quite an interesting subject. According to your formula I had already maxed out my yield per sq ft with 1200w of COB lighting per 8x4 (870 umol/s ppfd). On this run I added another 600w so I have 1800w per 8x4... am I going to see any increase in yield? I am at 1400 umol/s ppfd now.
Hard to say if increased light will equal increased yield. Usually there is some increase but it drops off rapidly. Like I read an article where they got a little over 400 g/sq meter with 270w of HPS and got around 560 with 600w, which interestingly is right about 44g/sq ft, taking a sq meter as roughly 13 sq feet.
Well yup she struggled but not due to deficiencies but more lack of water I think. Also the pic takin was after it had went through 3-4 hard frosts and was harvested the next day. The pic was more to show that some of the pics I see here that state they were a two pound plant are IMO suspect
. Here's a pic of her just before harvest 
and yes if it wasn't for the temps she should have had another 10 days I think. Moral of this story is sativa and outdoors in Ontario is a bad thing lol.
i thought about doing something simiilar for the bloom period for sure ... i like that idea of that tech. thanks for sharing b/o !
Don't you find reduced potency with the 11/13 the last 2 weeks? I don't think reducing it from 12 will actually help anything. I reduced to 8 hours light on the last week of my last batch and it was less potent and there was no ripening effect that I could notice being different from 12.
can't say that i do find that.... but i do believe it is possible fi sure but also strain dependent. Ive spoken with guru's at the cups and conventions and always have questions for them.
Maybe just for the last 2 weeks it's not too bad on potency. I've read things where using 11/13 for the whole flower cycle cut potency almost in half, about 10% THC as opposed to about 20. I haven't personally found a benefit to reduced hours. I let em go for 10 weeks and they ripen up naturally, at least to my satisfaction. Aren't many Indica hybrids that won't ripen in 10 weeks on 12 hours. Many people are just too impatient and try to speed things up. What's the point? Once you have a multi-stage setup you get harvests every few weeks anyway, there's no big wait. My advice is simply 12/12 except for maybe 13/11 in the early weeks of flowering. 12/12 gives just the right bud density and highest potency, higher than 11 and higher than 13. Could maybe go about 15 minutes either side of 12 but that's about it.
Yeah I've seen data showing max potency at week 7, though it's only very slightly less potent at later weeks. The table I saw showed 8.94% THC at 7 weeks, 8.92 at week 8, 8.92 again at week 9 and 8.33 at week 10. So actually it's pretty much the same from 7 to 10 weeks. However, the buds at earlier weeks will of course be small so it would be counterproductive to harvest at week 7.
It works for me just to schedule chopping at the end of week 10 regardless of anything else. Besides, the studies have shown as mentioned earlier that THC content doesn't actually change much from week 7 to 10, so what's the point of doing all that microscopic examination of trichs? After week 7 it's all a matter of getting the most amount of the similarly potent buds and the highest calyx to internal stems ratio which means improvement in smoking quality. They're just not real buds before 10 weeks, they're underinflated harsh mockeries of buds.
What's wrong with pulling the plant when it's ready, rather than being stuck on the calendar? Sometimes a plant is done at 50 days, sometimes it wants 70.
