would like opinions on seedling light schedule

[oldmac]

As for the scientific reason why plants DO grow at night, here you go:

[align=left]During the daytime, plants produce energy in the form of ATP and NADPH (light reactions)...during the night, these energy forms go to the dark reactions (Calvin Cycle) to fuel the production of organic molecules from CO2 collected during the day...some of these organic molecules will be stored (starch) and some will be used for plant structural growth (cellulose), and some for other organic molecules (lipids, proteins, etc).[/align]

[align=left]GTD[/align]

Again the Calvin cycle explain's what a plant is doing internally, from a chemical, hormone and transport of stored energy/nutrient perspective. If you read or look at at the picture description's you'll see that it is during photosynthesis that the plant grows, plus stores energy etc. The Calvin Theroy does not support plant grwoth during the dark phase.

One thing that is clear to me, you at least realize that plants "don't need to rest" as some claim to support the plants in veg need a dark time to rest.

People need rest but plants are 24hr factories, and in fact a case can be made that they work equally/or more at dark then during lights on. This is more true during the flowering phase where they do need a dark period to accomplish many things, such as the building up of the hormone floragen along with other chemical functions.
OM

oldmac Reviewed by oldmac on 12-14-2010. would like opinions on seedling light schedule just started my first indoor grow- been doing it outside since 1972- got a lot to learn for-sure I have started my seeds , sprouting today- I have them under a 1k MH , I am able to maintain a 72 degree temp 24 inches from tops- should I be running a 20 on 4 off for now- or should I be doing a 16 on 8 off then switch to 20-4 after roots are established- googled this ? and got a bunch of different opinions on using MH at this stage, it is what I have for now HELP !:thumbsup: Rating: 5