Re: Fw: long day vs short day onions
From my readings its stated that precise photoperiods are one of the least
understood process'of plant growth(this process is acheived in the
foliage)..(scientists continue to work on it of course).
Understanding (what is known) is very important to the flowering,etc. of some of
those requiring exact light/dark cycles,etc.can assist you in successfully
cycling (hence seed) lesser knowns, exotics..
One interesting example cited was Soybeans:one single minute of light at midnight
caused it to start its natural timer cycle of 24hrs, all over from the
beginning..Hence any breeding or discovery of day neutral varieties can serve to
by pass this factor.
Not a simple subject and many variables involved..Fortunately most are not
affected greatly ..I have observed seed coming from the equator will frequently
require 12hr.dark/12hr.light to bring them into flower..
Connie
Margaret Lauterbach wrote:
> At 10:34 PM 3/2/01 -0600, you wrote:
> >Claire wrote:
> >I have never heard of Oklahoma having a botanically recognized dividing line
> >for long and short season plants.
> >
> >Hi Claire, If I understood Rebecca right, she was talking about the length
> >of the day, rather than the season. Does that make a difference?
> >
> >Cindy Johnson
> >White Bear Lake, MN
> >zone 4a
>
> Territorial Seed Co. recommends "long-day varieties in states north of the
> kansas/oklahoma border, and planting short-day types south of this line,
> roughly 36* latitude." IIRC the operant factor here is actually the length
> of the nights that governs growth in onions and strawberries, the only
> things I can think of that have varieties sensitive to "day (night)
> length." Margaret L
