question on sunrise/sunset times and light dep....

[GET MO]

here is a guide to sunrise sunset times...
http://www.timeanddate.com/worldclock/astronomy.html?n=803&month=3&year=2014&obj=sun&afl=-11&day=1

I was planning on putting plants out real real soon, my question is would it be necessary to pull plastic or can I get away with not pulling until the end of march? I figure if light time is anything under 13 hours then it would most likely stay in flower, but to be safe I was going to start at around 12 1/2 hours. Thoughts? Experience? Thanks!

 

[fisher15]

We put out a spring crop about this time last year, expecting to start bloom immediately under the current amount of light..NorCal. They just sat there for almost two weeks until we started covering 12/12. The increasing light messes with initiation, I think.

 

[GET MO]

but how do u cover for 12/12 when there is less than 12 hours of light per day?

 

[fisher15]

Tarp was on from 8p-8a. They got what light there was. Finished out nice..like the summer light deps.

 

[palmero]

but how do u cover for 12/12 when there is less than 12 hours of light per day?

Funny, was researching this yesterday.
Look for the data you find under "civil twilight"

http://www.timeanddate.com/worldclock/astronomy.html?n=803&month=3&year=2014&obj=sun&afl=-13&day=1



in the link above, how many hours?
There are other opinions, but it is not only sunrise to sunset.

 

[GET MO]

Good info! thanks yall.