increasing flowering light from 12/12 to 21/12

I read on the faq's that extendind the light period almost twice the length of the dark period and shortening the week from 7 days to 5 will increase yeild, but will this stress my plants that have been flowering for about 8 days with 12/12? I cant see it doing too much but im not wanting to stress and possibly hermie them. Anybody have experience or knowledge with increasing the light period?

wheres this FAQ I've heard of increasing in the last 2 weeks from 12/12 to 14/10 because reverting at that stage of flower isnt going to happen but doublin and making your days longer doesnt make sense because the plants react to photo period shortining not lengthining no matter what the dark period is the light period makes the diff..

I'd be interested in that link too.

I was under the impression that darkness was more important than light. I guess it makes sense to me as you can introduce a bit of darkness during light hours without much trouble but introducing light to dark periods is a no no.

Well you have to look at it like this- there is no 24 hour day in the plants life, having 12 hours dark and 12 hours light. Itstead the days would have 33 hours 36 minutes with 21:36 of light and then 12 hours of dark. It makes since to me but ill let you read it for yourself. Go to the top of the page and click on the "FAQ" icon, then go over to number 9. Advanced tech. for experi. growers, click on it then click on "improving your yeilds", then "larger yeilds". The light and equipment effeciency sounds ligit to me, i have a 1 year warrenty on my bulb, so it doenst go by hours used, but amount of days(1 year). I just did some quick math and within 7 days worth of hours(16, the 12/12 period gets 84 hours of light, where as the 21.36/12 gets about 107.42 hours. i could be wrong but it looked accurate. But does anybody have any advice on this?

...That smily face should be an 8

Good advice

Sorry Shwisatwista. Couldn't resist that one

I'll check it out. Sounds really interesting.

Klo$etBreeder said:

wheres this FAQ I've heard of increasing in the last 2 weeks from 12/12 to 14/10 because reverting at that stage of flower isnt going to happen but doublin and making your days longer doesnt make sense because the plants react to photo period shortining not lengthining no matter what the dark period is the light period makes the diff..

Click to expand...

https://www.rollitup.org/advanced-marijuana-cultivation/161989-photoperiod-manipulation-larger-yeild.html

anybody have any input?

well from what i've learned/read etc.. If a plant has more then 14 hours of light it would go into veg again. My light is currently 12:30/11:30, with it being my first grow I dont have any past experience to compare it to but my plants/buds are still increasing quite a bit on a daily basis with no signs of seeds at all.

i read a post a couple months ago about light schedules to produce higher yields and to sex your plants sooner. I can tell you that i turned my light off for 24 hours when i first put my plants into flowering and then four weeks later i turned them off again for 24 hours. All it really did for me is cause me to have a hermie. I had four females and one diked on me. But that hermie also could of come from a trait in the strain. I think it was because of turning my light off that second time. im not an exprienced grower with indoors. This is only my fourth grow indoors.

Having read the article I wouldn't go for it personally but it is this kind of thinking that brought us hydro / aero, led's and those mad clone barrels where all the clones are grown sideways.

For me there's a few things wrong.
No scientific reasoning for the 21:36 isn't enough on it's own but if the plant thinks 1 full day = 21:36 + 12 then it may see longer days than nights and revert back to veg.
Also the 40% more flowering time bothers me. 80% more light will not mean 80% more yield as light is only one component of growth. If you use the time taken for 2 of these grows you would be 2 weeks off your third harvest under normal conditions and I know which would yield more when it's put like that.

hes going to hermie his plants

Today completes the first week of 12:30/11:30 still no sign of hermies and my girlies are looking peachy

O ok yea i think mollasses is my answer, i just top dressed with 2 tbsp of 10-10-2(pellets) to tide my plants over until my next tea, watering lightly several times to break up the tablets(looks like rabbit food). But ill know in the future that mollasses will be a good option. I plan on watering my 1.7 month old plants, as well my 10 day old flowering plants with 10-10-2(might be 1) seabird guano, but i'm going to delute my flowering mixture a little bit. (although i remember sombody, i think ohso, saying that it will only increase the area of affect rather than deluting it when mixing in more water. But im still going to try to delute it). I feel ya on that spt causing nute burn when feeding every other week. I was confused because id feed normal doses with spt mixed in and id see burnt tips and then i realized that spt will exhaust itself in a sense and break down the nutes too fast. So i watered my top dress with water/spt mixture to start to adjust to it, and ill continue in the future. I like how you prewet the soil and come back 5 mins later, iv been thinking about doing that.

On my next flowering tea im aiming to get a NPK of 1.5-13-14-tryin and true advice from Soma, but i haven't been able to find a guano with potassium. Is there another source that i can get it from?

And i have 2 plants, each different strain. One is still pretty green with only small light green coloring, but it does have some rust spots on it and kind of burnt tips, but i cut them off. I think this strain needs less nutes, would i be correct in that assertation?

My other plant is just a couple shades lighter of green then normal, there wasn't many burnt leaves/spots but it was over all a lighter green, would this plant need more nutes then normal? Iv feed both plants the same mixture, so if you could give your diagnosis i'd appreciate it. Its only my first go around but once i have this first grow done i should have a good idea of everything.

But damn i need that candy in my life, im still rolling up pine, but it gets the job done in the mean time, but alright iv been rambling on long enough,but thanks for answering my past and current questions Ohso. OG swish

lol shit. I'm having some trouble posting shit, it says i have to refresh and that was my last copy and paste, but ill paste what i intended to say in a min

If you think about and try to put the time schedule on a calender, its not 40% light, because on 12/12 after the light period comes only a 12 hour dark then another 12 hours light. So when you really think about it its really only about a 18-25% increase in light time, as my previous post said how with 12/12 produces 84 hours of light and then the 21/12 produces 107 hours of light a week.

I dont see a point in 24 hours dark at the begining of flowering because that would mess up the normal cycle. Im not saying more dark, im sayin more light in one light/dark cycle. There must be some reasoning behind the FAQ's suggesting exactly 12 hours 36 mins of light in one light cycle rather than 22 hours of light then 12 dark. People read posts too fast i guess because they're not talking about the same point im talking about.

I havent tested it yet but i plan to with a small amount of clones. Personally i think it has alot of truth behind it and i think it'll work. Its only about a 20 hour increase in light a week, its not 40% more, that'd be extreme. But i think its worth testing so im going to test it and report back to this post-for sure. It might not be until a month or 2 but ill be back with results lol

There must be some reasoning behind the FAQ's suggesting exactly 12 hours 36 mins of light in one light cycle rather than 22 hours of light then 12 dark.

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When you change the light cycle for any reason its telling the plants that the seasons are changing so they can do what they have to do. IMHO as the seasons change the days get longer or shorter, in our world the light cycle does not change all at the same time it does it gradually. Thats where the :36 comes in, might not seem much to you but it means a lot to the plant and it notices it as you really wouldn't. So the extra 36 min. is the sun going completely down (cause the seaon is changing) signalling the plants that the end of their life cycle is near making them go into over drive to finish their flower/bud's up. (hopefully that made sense )

it is the hours of darkness not the hours of light that cause flowering. So technically speaking you should be able to do. I think one may be able to get away with maybe 16/12 with little or no problem. But to increase it more than that I think would stress the hell out of them. Would they finish faster or just keep getting huge? I think they would just finish faster. someone should try it.

Iv read it makes them more effecient, we'll see. Im gonna test in about a month