How quickly do fluids move from roots after lights on?

WeedFreak78

Well-Known Member
Been reading about optimal harvesting windows and harvesting during the dark. Just curious how quickly fluids are moved from the roots upwards when lights come on. I figure there is a window after the lights come on before starches, sugars, etc start moving, I'm thinking it's fairly quick. .maybe 15mins? Idk..maybe an hour? ....anyone have any idea?
 

brimck325

Well-Known Member
that is a good question, i chop just before lights on with a small cfl for light. i go into my room with a cfl all throughout flower with no ill effects.
 

RM3

Well-Known Member
Not gonna bash the notions here because the best way to learn is to try things and see for yourself 8)

I harvest with lights on, I know the forum rhetoric says that light degrades THC, but I have actually done the test and guess what ,,,,,,, it takes a month !!! That's right I tested a bud after dry THC was 25%, I left a good sized bud sit out on my coffee table exposed to light and air, it dried to dust when touched and after a month of just sittin there it tested at 22% THC with only 1% of CBN added. Do the test yourself http://www.thctestkits.com/ and see that most of what is spread as truth in these forums is nonsense

as to your question, let one go dry and droop, then time how long it takes to restore tugor after you water it
 

WeedFreak78

Well-Known Member
Not gonna bash the notions here because the best way to learn is to try things and see for yourself 8)

I harvest with lights on, I know the forum rhetoric says that light degrades THC, but I have actually done the test and guess what ,,,,,,, it takes a month !!! That's right I tested a bud after dry THC was 25%, I left a good sized bud sit out on my coffee table exposed to light and air, it dried to dust when touched and after a month of just sittin there it tested at 22% THC with only 1% of CBN added. Do the test yourself http://www.thctestkits.com/ and see that most of what is spread as truth in these forums is nonsense
Light degradation after harvest was never something I really worried about, I doubt most people can tell the difference of a couple percent THC. Makes me wonder if, and if so how much, properly stored bud degrades.

as to your question, let one go dry and droop, then time how long it takes to restore tugor after you water it
I know my aero systems bounce back fairly quick if I forget to turn pumps on. I wouldn't want to pull a dwc plant and let it dry to wilting to see what happens. Problem is internal pressure is really low in a dehydrated plant allowing quicker fluid uptake than in a fully hydrated plant, such as we have at lights on. I'm sure there's scholarly articles about capillary transfer rates of plants out there, not interested enough to go looking
 

churchhaze

Well-Known Member
Not gonna bash the notions here because the best way to learn is to try things and see for yourself 8)

I harvest with lights on, I know the forum rhetoric says that light degrades THC, but I have actually done the test and guess what ,,,,,,, it takes a month !!! That's right I tested a bud after dry THC was 25%, I left a good sized bud sit out on my coffee table exposed to light and air, it dried to dust when touched and after a month of just sittin there it tested at 22% THC with only 1% of CBN added. Do the test yourself http://www.thctestkits.com/ and see that most of what is spread as truth in these forums is nonsense

as to your question, let one go dry and droop, then time how long it takes to restore tugor after you water it
You are the forum rhetoric. Btw, he never asked about THC degradation.
 

churchhaze

Well-Known Member
Been reading about optimal harvesting windows and harvesting during the dark. Just curious how quickly fluids are moved from the roots upwards when lights come on. I figure there is a window after the lights come on before starches, sugars, etc start moving, I'm thinking it's fairly quick. .maybe 15mins? Idk..maybe an hour? ....anyone have any idea?
Forgetting about root starches remobilizing upward all together, also consider that if you wait 15 minutes after lights on, the leaves will only have 15 minutes to synthesis starch and store it in their chloroplasts. The best time to cut is right before the lights come on, and the worst time to cut is right before they go off. This is because the leaves are saturated with starch when the lights turn out, which they are mostly empty in starch when the lights come on.

It doesn't make a huge difference, but it makes more sense to reduce starch as much as possible before cutting.

Leaf starch over 24 hours. (with 12 hour light period)
 

churchhaze

Well-Known Member
No, he said he was gonna leave em in the dark

and you still have not answered my question 8)
What's funny is you wouldn't present your test results in another thread, but you openly do it here. So 25%. Not bad at all.
 

RM3

Well-Known Member
What's funny is you wouldn't present your test results in another thread, but you openly do it here. So 25%. Not bad at all.
a pic of the actual test plate on my website 8)

and you still have not answered my question ???
 

RM3

Well-Known Member
Ummmm...I HAVE read about it, but it was never mentioned here.


Meaning right before/at lights on. Nothing was ever said about prolonged dark periods. My initial post specifically asks about plant response at lights on.....
Ok, sorry I tried to help
 

greasemonkeymann

Well-Known Member
Been reading about optimal harvesting windows and harvesting during the dark. Just curious how quickly fluids are moved from the roots upwards when lights come on. I figure there is a window after the lights come on before starches, sugars, etc start moving, I'm thinking it's fairly quick. .maybe 15mins? Idk..maybe an hour? ....anyone have any idea?
the second the lights are on photosynthesis occurs which would kickstart the whole processa
the xylem and phloem work relatively fast considering there is not "pump" behind it all
water transpiration can be as fast as 30 meters per hour.
the phloem is a bit slower, depending moreso on hydrostatic pressure rather than hydroscopic adhesion (like the xylem)
 
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