Cannabis Daily Light Integral

[ttystikk]

650PAR looks like the sweet spot?

wonder if youd get a big boost by injecting CO2 to roots at night.

I will do an experiment on that,

Roots want O2. Leaves want CO2 but only during daytime.

By all means, experiment.

 

[ttystikk]

I will be interested to see how it plays out
Best of luck with it

Hey there buddy! I was hoping I'd see you in this thread!

Have you run a 6 on, 18 off cycle? If so, what were your results?

 

[torontoke]

Hey there buddy! I was hoping I'd see you in this thread!

Have you run a 6 on, 18 off cycle? If so, what were your results?

I started my experiment phase with 6/18 using a 400 mh imo it wasn’t enough light for such a short period of time and bud formation was severely less.
I think with a better spectrum and the new fancy leds make it possible but I wouldn’t try less then 8 again myself.
I appreciate watching people try things tho and will keep an eye on how these guys find it.

 

[InTheValley]

Im definitly going to try all this. I got my DYI CO2 box and mix read y to go for tonight.

Ill take pics too, but how long it will go, IDK, because I dont know sex, and its under 12/14 right now, and its topped and only 11 days old.

 

[torontoke]

I was thinking also that the DLI approach can be used in veg times when using the gas lighting technique to show sex earlier but maintaing same growing ratio that a 18/6

Unfortunately I think you will be sadly let down with this approach to glr.
I tried it again over a two year period and found that certain genetics would start to flower and it was a giant pita for a few hours of savings.
Using glr and then a reduced flower cycle will shave weeks off the total grow time but you would lose the growth equivalent so it’s a sideways step at best.

 

[InTheValley]

if your doing several perpetuals, it could be cool.

 

[PSUAGRO.]

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.

We shouldn't be monocropping, but old habits are hard to break.

 

[nachooo]

Unfortunately I think you will be sadly let down with this approach to glr.
I tried it again over a two year period and found that certain genetics would start to flower and it was a giant pita for a few hours of savings.
Using glr and then a reduced flower cycle will shave weeks off the total grow time but you would lose the growth equivalent so it’s a sideways step at best.

Maybe using a 12 on / 5 off/ 2on / 5 off instead of the classical 12 on/ 5.5 off/ 1 on/ 5.5 off would work in more strains...

 

[nachooo]

Or even.. a 6on/6off/6on/6off with a DLI equal to a clasical 18/6 could be interesting...

 

[Slinging PAR]

Or even.. a 6on/6off/6on/6off with a DLI equal to a clasical 18/6 could be interesting...

Or 24/0 with the right DLI

 

[nfhiggs]

youd get a big boost by injecting CO2 to roots at night

Plants do not absorb CO2 at the roots.

 

[nfhiggs]

Roots uptake CO2, and leafs take in O2 at night

That might be true for C4 class plants, but not a C3. Cannabis is a C3 plant.

 

[Slinging PAR]

Plants do not absorb CO2 at the roots.

Plus it would displace any O2, N2 down in the root zone potentially causing problems.

 

[InTheValley]

That might be true for C4 class plants, but not a C3. Cannabis is a C3 plant.

ok, didnt know that.

well, we'll see anyways, its already sleeping with CO2 being injected into the root system as we speak.

at lights on, its will be injected with O2,

*shruggs, just experiment, no big loss.

 

[nfhiggs]

Plus it would displace any O2, N2 down in the root zone potentially causing problems.

I would think it would encourage anaerobic bacteria (pythium for example) while being detrimental to the beneficial aerobic bacteria that we want in the root zone

 

[Rahz]

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.

What kind of yields are you getting using those techniques?

 

[Slinging PAR]

I would think it would encourage anaerobic bacteria (pythium for example) while being detrimental to the beneficial aerobic bacteria that we want in the root zone

Or azosbacterin! Slime them! But pythium is everywhere and only takes hold on weakened plants.

What kind of yields are you getting using those techniques?

On pages 2,3 of this thread. My last run with a sativa netted 1300-1600g/m2 with all 4 chambers, 120 days flower which is what it normally takes to finish using 12/12.

 

[Rahz]

On pages 2,3 of this thread. My last run with a sativa netted 1300-1600g/m2 with all 4 chambers, 120 days flower which is what it normally takes to finish using 12/12.

Apologies for not catching that. Yield results are on page 4, averaging 1100 g/m2 for the hybrids. Very nice. You are utilizing vertical growing methods for those chambers?

 

[Slinging PAR]

Apologies for not catching that. Yield results are on page 4, averaging 1100 g/m2 for the hybrids. Very nice. You are utilizing vertical growing methods for those chambers?

Have to. Everything is tied down to the outer walls with the canopy forming a bowl shape mid to late flowering. The lights are in the middle, and contrary to the common practice of spreading them out, the 12 cobs are in a 3x4 matrix about 1' between each other. That was the best way to distribute the light equally to the most leaf area. Air flow is being cycled between all 4 chambers in a semi closed loop using fan/filter combos and ducting. Total wattage is just under 650w at any given time, up to 400 for light and 250 for all the fans.

It was a lot of work, I would only recommend it for hobbyists with a lot of patience. Light was adjusted daily measured with a hf par meter. With 6 hour light periods you have to schedule around the clock. 6 months of that will change your motivation and if not, trimming it will

 

[vintagedvd]

So I'll resurrect this topic because I feel it deserve it.

I found very interesting the drooping of the leaves. I'm not sure when I'll test the watering drooping because I never let it really dry more than 95%, but the DLI drooping (Daily Light Integral) makes me mad that I didn't found it myself, as smart as I am and all
In my defense, although I grow for many years, I only grow 2 per year, one at a time because of space and temperature limitations.
BTW, I have a 90X90cm grow space (about 3X3 feet), and grow SCROG.

So I have a new SSH growing and I felt it grows a little too slow for my liking. I have 4X50W COBs and I always start with one at 40cm, than every 10 days I light one more. I started searching yesterday on the forum if the light is the culprit and the plant wants more, or she doesn't like topping, and I found this.

I immediately powered another COB and at "the end of the day" the leaves didn't droop at all, so I guess it wants more. I'll power a 3rd one in a few hours at the "start of the day" and let you know tomorrow how that goes.

It's a revolutionary theorem if that's the case, including having a shorter day in flower, if you have enough MOLs and a good environment. But even for very small growers like me, this is great.

Thanks for sharing!