Cannabis Daily Light Integral
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InTheValley
Well-Known Member
at night, its reverse. Roots uptake CO2, and leafs take in O2 at night.
I already have a small seedling, about 12 days old, with air injection. So at night, Ill put the air pump in a box with CO2 from a DYI sugar/yeast generator. Just for shits and giggles..
elkamino
Well-Known Member
Plants absorb CO2 through stomata in their leaves, not roots
InTheValley
Well-Known Member
so, theoretically speaking, in flower, we can blast it with 2000PAR for 4 hours, Hit with 730nm at night, reduce night time to 10 hours, so, each day, is really ?.
InTheValley
Well-Known Member
http://www.co2science.org/subject/r/summaries/roots.php
A final question that has periodically intrigued researchers is whether plants take up carbon through their roots in addition to through their leaves. Although a definitive answer eludes us, various aspects of the issue have been described by Idso (1989), who we quote as follows.
"Although several investigators have claimed that plants should receive little direct benefit from dissolved CO2 (Stolwijk et al., 1957; Skok et al., 1962; Splittstoesser, 1966), a number of experiments have produced significant increases in root growth (Erickson, 1946; Leonard and Pinckard, 1946; Geisler, 1963; Yorgalevitch and Janes, 198
, as well as yield itself (Kursanov et al., 1951; Grinfeld, 1954; Nakayama and Bucks, 1980; Baron and Gorski, 1986), with CO2-enriched irrigation water. Early on, Misra (1951) suggested that this beneficent effect may be related to CO2-induced changes in soil nutrient availability; and this hypothesis may well be correct. Arteca et al. (1979), for example, have observed K, Ca and Mg to be better absorbed by potato roots when the concentration of CO2 in the soil solution is increased; while Mauney and Hendrix (198 found Zn and Mn to be better absorbed by cotton under such conditions, and Yurgalevitch and Janes (198 found an enhancement of the absorption of Rb by tomato roots. In all cases, large increases in either total plant growth or ultimate yield accompanied the enhanced uptake of nutrients. Consequently, as it has been suggested that CO2 concentration plays a major role in determining the porosity, plasticity and charge of cell membranes (Jackson and Coleman, 1959; Mitz, 1979), which could thereby alter ion uptake and organic acid production (Yorgalevitch and Janes, 198, it is possible that some such suite of mechanisms may well be responsible for the plant productivity increases often observed to result from enhanced concentrations of CO2 in the soil solution."Although much is thus known about many aspects of root responses to atmospheric CO2 enrichment, much remains to be learned. Nevertheless, it is abundantly evident that plant roots, like most other plant organs, typically do better in CO2-enriched air than in current ambient air.
Slinging PAR
Well-Known Member
Anything stopping you from having a light source below the canopy blasting up? Kind of like a spotlight.
Regarding maximizing your grow area you should think in space not area. The vertical space provides significantly more exposure to light than the horizontal area. Plant doesn't care if it is getting light from an angle. It will adjust.
Best proof you can have is doing it for yourself.
Nitrogen too.
Somewhat. I am running 6/18 with 1500-1700 umols. Nachoo is doing 10/14. Increasing the dark time rather than shortening it seems to work better.
nachooo
Well-Known Member
If I could manage the heat better I would increase PPFD and go for 8/16 for sure... Just wonder myself why a mini air conditioner of about 150 watts for little or medium tents is not in the market... I would build myself a peltier cooler device..but they are so inefficient...
By the way...Slinging..I like a lot the rotating tents idea...also you benefit for the CO2 that plants in the dark are producing...
InTheValley
Well-Known Member
I use a sonoff, i could test the 2 days in 1 theory. 4 on, 10 off, 4 on, 10 off. But i can only get to 700-800 PAR, need to get bigger driver to run my luminus at 100watts atleast each. going to be adding QBs for side lighting. Not really side lighting but pitched like a roof over the grow area.
edit: I get 1000 par at 12inches at 1400ma,
but i can use my Perfect sun mini, hits 2000 par at 10inches, and 1700 at 12inches.
hummmm,
crap, i have a fusion board coming too, lol..
edit: I get 1000 par at 12inches at 1400ma,
but i can use my Perfect sun mini, hits 2000 par at 10inches, and 1700 at 12inches.
hummmm,
crap, i have a fusion board coming too, lol..
I posted something similar recently when thinking about side lighting. I haven't seen any two dimensional plants, so why only think in terms of light over a given area?
We should think of the grow in terms of volume, not just area. I'd say a 2 x 2 x 8 tent can grow a larger plant and utilize more light than a 2 x 2 x 4.
torontoke
Well-Known Member
To really test your theory or idea of a full 2 in 1 you might be better off trying 4/8,4/8 so every 24 hours is exactly 2 light cycle days
InTheValley
Well-Known Member
8 hours isnt enough for TPE night hormone accumulation,
InTheValley
Well-Known Member
If we hit the DLI, in 4 hours, it should be enough, per the posts above, is what im just going off. I know, to flower, 12 is benchmark, but adding 730nm will reduce by 2 hours, why i came to the 10 hours minimum night hours.
Slinging PAR
Well-Known Member
Circadian rhythm is a 24hr cycle. Plants follow it so you won't be able to shorten the flowering phase to get the '2' days in '1' day I think.
The extra darkness is good. Remember the plants will still use stored energy in the dark.
Yeah, they are all almost one ecosystem. It is a lot of work though.
While fun to figure out and try new things, without pressure to maximize production it is far easier to take it easy and let the plants run on auto sacrificing some yield. You get out what you put into it.
Don't go wasting resources on ac if you don't have to. It would be put to better use with more cobs to run the same power but much more efficiently. With Vero 29 C, they aren't even warm to the touch until you hit 30w when stuck to simple aluminum sheet. 30w for 3000k 80 cri hits the magic 3 umol/J.
nachooo
Well-Known Member
I try to run my leds at very low amps..but my problem are my home ambient temps in summer and late spring...It was imposible to grow under HID in summer , this was solved using leds..but anyway, without AC my summer crop has always more airy buds... Of course my lamps are on at night or early morning, when ambient temps are lower...but...still lot of heat in the sunny spanish summer
wietefras
Well-Known Member
In nature that is true yes, but they adjust their rhythm when you give/force them another rhythm.
I've seen people go for different length days and plants adjust to it just fine.
I myself have experimented with different numbers of hours for light on and the plants adjust for that too. You see their whole rhythm adjust to the new beat.
Just as well as that they are fine with continuous light and no night at all.
PSUAGRO.
Well-Known Member
where we talking about macros? no, he said he wanted to inject co2 into his root system............
Slinging PAR
Well-Known Member
I agreed with you - it should be O2 and I added Nitrogen
Clover and micros work. They are present in natural soil so adding them back into other mediums was logical to me. Look up azospirillum and azotobacter. They help keep everything in check and provide a good ph buffer by thriving in alkaline environments which would normally lock out nitrogen. Plus they have other goodies.