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What you are seeing with the tips of the plants turning is related a conbination of plant reponses to spectrums. Blue light destroys auxin and the auxin causes plant cells to expand, but blue light destroying the auxin causes the cells to stink, which causes the plant to turn towards Blue light. A similar effect occurs from increased Far Red to Red ratios, which cause the cells on the opposite side of the stem from the radiation source to expand.
What you are seeing is a response to the segregation of the Blue, Red and Far Red spectrums compared to time as the plant changes from one spectrum responce to another. Without the Blue responce in PAD (Red Inc.'s) the plant isn't as strongly guided towards the radiation source and it wanders a bit due to the increase in auxin in the expanding cells on the sources side of the stems. Plants do this in Natural Darkness, both SID and SOD, and the only reason it seems odd to you is that you wouldn't likely notice this in Natural Darkness where it's harder to make such observations. Interesting how how PAD teaches stuff that was always there but we just don't notice it in more "Natural" environments..
This explains it nicely.. Thanks
Originally Posted by salmayo
"Should we start turning the red inc's off just before this happens or is this one of the effects of having increased far red?" If you can't stand to see it, but the Far Red:Red ratio would actually be higher when this happens in the dark when you wouldn't notice it so much..
Oh ya I can stand to see it. I just wanted to make sure it wasn't some funky thing happening to the girls. I like it..:thumbsup:
Originally Posted by salmayo
I'd say watch your stem elongation for the final decision. And by stem elongation I mean the internode distance more than the overall stem height increase, because you get more growth from PAD compared to SID..
Defiantly will watch internode distance
Originally Posted by salmayo
If I was getting more nodes with the same exact amount of early flower stretch, I'd consider it an advantage..