Re: HYB: indoor versus outdoor growth

Bill,

I'm reading a Botany textbook:  Introductory Botany; Plants, People, and the Environment by Linda Berg.  This text does refer to the dark red light as far-red.  Needless to say it is not an in-depth exploration of different types of light and their uses for houseplants.  It just seemed like some of it might be relevant.

chrisitian




________________________________
From: Bill Chaney <billchaney@ymail.com>
To: iris@hort.net
Sent: Sunday, July 5, 2009 3:17:38 AM
Subject: Re: [iris] HYB: indoor versus outdoor growth

Christian,

I am curious about "dark red light" and if this is the same as
"far-red light?  Could you share with us where you were reading about red and
dark red light?  I have been exploring the new LED grow lights that come in
mixtures of red and blue for growth and flowering.  Of course, much of the
info is aimed at indoor pot growers, but some of it is good information just
the same.  

Thanks for any information you can share.

Bill
________________________________
From: christian foster
<flatnflashy@yahoo.com>
To: iris@hort.net
Sent: Saturday, July 4, 2009 7:34:17
PM
Subject: Re: [iris] HYB: indoor versus outdoor growth

Steve, I read two
things just this morning that may or may not be relevant. One, apparently when
it comes to triggering growth/bloom it is the duration of the darkness that is
most significant, not the duration of the light.  The hypothesis I read was
that there is some unknown hormone that is manufactured in darkness.  When the
darkness is too short (in some plant species) or too long (in other plant
species) the plant cannot build up enough of this hormone to stimulate (or
inhibit) the affected growth processes. The other thing I read was about two
types of light, red light and dark red light.  Apparently, red light
stimulates certain growth processes including bloom and germination and dark
red light inhibits these processes.  They function like a light switch,
whichever one was left on last is the one that has the influence.  So if the
plant is exposed to constant dark red light it will be vegetative and never
bloom.  If the last exposure was to red
light then germination and bloom sequences will be activated. Actually, I was
thinking that this red/dark-red sequence might explain certain phenomena that
some of us have observed in our burritoed seeds, like how they seem to
germinate in flushes, and how germination seems to "shut off" while seeds
still appear viable.  Previously we have hypothesized that these patterns were
due to the short exposures to warm air while we process our burritoed seeds,
but it seems likely that our seeds may be exposed to red/dark-red lights at
these same intervals. Christian ________________________________
From:
mahlberg s To: iris@hort.net
Sent: Saturday, July 4, 2009 9:05:59 PM
Subject:
[iris] HYB: indoor versus outdoor growth Hello,
I have a question concerning
iris growth indoor versus outdoors.
I have raised several various iris
seedlings over winter.
I have noticed decent growth, but the growth seems to
improve after I move the
plants outside.
Even if I leave them in pots, they
grow better outside, regardless of the
outside temperature.
I'd better
understand improvements or quicker growth rates in warmer temps,
but it
doesn't seem to matter.
Is this simply a matter of artificial light versus
sunlight?
I've tried experimenting with12 hour on/off light and 24 hr light on
with
various spectrum flourescent lighting.
Granted my basement is consistant
in cooler temps over the winter, but at the
beginning of my outside growing
season,
when I place potted irises outside, the temps are about the same or
cooler
than my basement during the daylight hours and
most certainly cooler at
night.
I still see improved growth outside.
I am pretty sure my artificial
lighting source is good enough to grow in but
not good enough to flourish.
Is
ther an ideal spectrum flourescent lighting source?
thanks for any insight as
to what I might be missing or overlooking. Steve zone 4b Minnesota
---------------------------------------------------------------------
To
sign-off this list, send email to majordomo@hort.net with the
message text
UNSUBSCRIBE IRIS
---------------------------------------------------------------------
To
sign-off this list, send email to majordomo@hort.net with the
message text
UNSUBSCRIBE IRIS

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index