dank'd
Well-Known Member
these two recent studies compliment each other in an interesting way. the first one (video @17:03, usa) uses various fixed photoperiods to flower three different 8 week varieties, 10L, 11L, 12L and 13L
the second study (article, australia) tests 6 or 7(?) varieties also of the 8 week flowering type but splits the flowering light schedule into 2 four week schedules of varying combinations consisting of 14L>12L, 14L>10L, 10L>14L, 12L>14L, and also straight through for 8 weeks 14L, 12L and 10L
in the first study, 10L straight through for the full 8 week flower cycle produced faster ripening with a more finished, higher quality looking flower, at a loss of yield. in the case of the og variety though they found that raising the light hours to 12L for the last four weeks of flowering increased yield as well as higher quality flower
in the second study we have similar findings but with a unique twist. generally they also found that at low light hours like 10L plants ripened faster at a loss in yield, but in some varieties the photoperiod could be raised to 14L, for an increase in 50% thc(!) and flower weight
BUT!...... ONLY, and i repeat, ONLY, if the 14L period is only for half of the flower cycle (4 weeks for an 8 week variety) and the other four weeks are of a lower daylight duration of anywhere from 10L to 12L
if the 14L photoperiod is continued for the full 8 weeks of flower?... thc yield drops by 2/5! as does trichome density
and here's another kicker. in the case of a high cbd variety, a 14L photoperiod for the full 8 weeks of flower will cause a massive INCREASE in cbd and flower!
so it seems from the two studies we know that like in nature, with the reduction of day length during flower we can [potentially] increase our cannabinoid and flower production in just two phases, AND, it doesn't matter if flowering is initiated with the low daylight hour phase or ends with it, the results should be similar, again, if the variety responds to it
and the australian study
https://www.mdpi.com/2223-7747/12/5/1061
some screen grabs from the first study
the second study (article, australia) tests 6 or 7(?) varieties also of the 8 week flowering type but splits the flowering light schedule into 2 four week schedules of varying combinations consisting of 14L>12L, 14L>10L, 10L>14L, 12L>14L, and also straight through for 8 weeks 14L, 12L and 10L
in the first study, 10L straight through for the full 8 week flower cycle produced faster ripening with a more finished, higher quality looking flower, at a loss of yield. in the case of the og variety though they found that raising the light hours to 12L for the last four weeks of flowering increased yield as well as higher quality flower
in the second study we have similar findings but with a unique twist. generally they also found that at low light hours like 10L plants ripened faster at a loss in yield, but in some varieties the photoperiod could be raised to 14L, for an increase in 50% thc(!) and flower weight
BUT!...... ONLY, and i repeat, ONLY, if the 14L period is only for half of the flower cycle (4 weeks for an 8 week variety) and the other four weeks are of a lower daylight duration of anywhere from 10L to 12L
if the 14L photoperiod is continued for the full 8 weeks of flower?... thc yield drops by 2/5! as does trichome density
and here's another kicker. in the case of a high cbd variety, a 14L photoperiod for the full 8 weeks of flower will cause a massive INCREASE in cbd and flower!
so it seems from the two studies we know that like in nature, with the reduction of day length during flower we can [potentially] increase our cannabinoid and flower production in just two phases, AND, it doesn't matter if flowering is initiated with the low daylight hour phase or ends with it, the results should be similar, again, if the variety responds to it
and the australian study
https://www.mdpi.com/2223-7747/12/5/1061
some screen grabs from the first study
