Manipulating the Lightig schedule to harvest early

[budrot]

Hi dudes,

I read that reducing the light hours in the first 3 weeks of 12/12 can shorten the flowering period quite significantly, with a slight reduction in yield.

I was told 11/13 0r even 11.5/12.5 would do this but I was hoping someone may have more facts on the matter.
I.e. The difference between reduction times and flowering times, and yeild.

I would like to shave a week off a 9 week strain or better.

Have any of you got any information for me on this please?

BR

 

[Scrogerman]

I wouldnt bother unless absolutely nessasary. It can make for lose airy buds too as well as the yield reduction, i say fk that for a week to 14 day extra, unless of course you had bugs or infection at the end, just not worth it imo.

Have a look at a forcing solution instead i would, like botanicares 'Ripe', i havent used it, but ive used GHRipen, Ok if used properly/sparingly for short period, instead of the light reduction. Im gonna try bots ripe myself! ill let ya know if you dont fancy giving it a go!

saying that you may be happy doing the light reduction with certain strains, id rather wait myself!
only one way to find out for sure! I cant see 11.5/12.5 making fk all of a difference myself! try it n let us know!

 

[budrot]

I've seen old posts on other forums from credible growers that mentioned this.

I just can't remember the facts.

I know its something like 25% reduction in Flower time for 10% reduction in yield - this is why I'm keen. I'm trying to hit the benchmark ''gram per what over 30 days average''.

 

[bigAl25]

I'm interested in this deal too because of a timer error in the 5th week of flowering. I have reduced the light by 1/2 hour so far. I am now on 11.5 on verses 12.5 off for the last 2 weeks of flower. I believe I lost 1 to 2 weeks of 12/12 during the 5th week of flower. I swear it is like starting over on the tops from week one. I bet the bottom buds finish before the tops this grow. I'll let you know on the yeild deal, I may take another 1/2 hour off the light cycle next week.

 

[bad gas]

i can't remember the exact thread where i got this info, but it was from icmag. the poster presented himself as a credible grower. he presented the results of a study where non-standard day length was studied. the conclusion was that 50-60% of daily growth was achieved in the first 6 hours of the day. therefore, why keep the lights on any longer? they recommended an 18 hour day length. veg=14 hr on and 4hr off. flower=6 hr on and 12hr off. they say the plants mature faster with less electricity. i don't remember if anything was said about yield loss. in one of my many books, the author said that this plant evolved with a 24 hr day length and any deviation from that was highly experimental. i'm not going to try this until greyskull, krunchbubble, giusmarius, evilme2, med man, etc. recommend this. these are the people who know the most. if this were a viable concept, they would be donig it. i'm sure they are aware of this and would be doing it if true. perhaps other people have more info. i'd like to hear about it. have a nice day.

 

[budrot]

greyskull, krunchbubble, giusmarius, evilme2, med man, etc.

where are these guys?

I heard that approach before, wasn't quite what I had in mind but it is something I might possibly look at.

I heard that you can reduce your flower time by as much as 25% by running only 11 hours light in the first 3 weeks of flower. I think the thread was on cannabis world but I can't find it now.

 

[budrot]

does anyone else have any experience of this?

 

[trevor112358]

i recall the opposite of what you want to know

i recall the opposite of what you want to know

does anyone else have any experience of this?

not personally, but i do recall reading a very interesting thread quite a few years ago (on OG iirc, hell it could have been in one of my books idk) it was about increasing yield with photo period manipulation. if memory serves me correctly, and sometimes it doesnt. they used a 21:36/12 light/dark photoperiod for something like 1-2 weeks during the period of fastest bud growth, week 5-6 or something like that. and it actually did increase yield but it was less than proportional to the ammount of extra light the crop received.

 

[Oldmac]

Wow, hearsay and unsubstantianed postings are no subsitute for real scientific knowledge. Here is a white paper done by the wonderfull folks at University of Mississippi (home of G-13) in Oct of '08 dealing with the optimum conditions to maximize growth indoors.
It is so geared to indoor growers, here is a quote from the second page, third paragraph; "....indoor cultivation of a selected high yeilding genotype/clone under controlled envriomental conditions is the most suitable way to maintain its potency and efficacy while circumventing the regulatory problems."

You need to seach for a paper like "How to grow less potent, less yeilding marijuana, to save few days" or something. This is what you are asking....I'm asking why?

OM