Re: NANFA-L-- plants and soil

Subject: Re: NANFA-L-- plants and soil
From: Todd Crail (farmertodd at
Date: Thu Sep 30 2004 - 19:03:35 CDT

PAR = Photosynthetically Available Radiation. It's a measure of how much
energy is in the spectrum where plants can utilize it for photosynthesis.
It's measured in some gosh awful conglomeration of units. It's basically a
bunch of physics crap that biologists can find useful from time to time by
lowering it or increasing it and playing with the plasticity of organisms
using it, as an example. But it looks really impressive when you put all
those units next to a graph ;)

----- Original Message -----
From: "Irate Mormon" <archimedes at>
>> The "R" in PAR of the lamps may be degrading it out of the wood faster
>> than
>> normal too.
> Huh? I'm confused. PAR is used to describe the shape of a bulb, as in
> PARabolic. The number following the PAR is the diameter of the bulb in
> 1/8ths
> of an inch.
> What "R" are you talking about?

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: Fri Dec 31 2004 - 11:27:24 CST