Re: [CH] Superscript usage in "Peppers: Vegetable and Spice Capsicums"

jim wolfe (yoda@cablespeed.com)
Fri, 25 Apr 2003 15:55:54 -0400 

not UK at all
 1st is saying 2 gram per liter
 2nd is sayingi  1.4 liters (dry) per square meter
 3rd is a little more complicated

umol is often used to specify the concentration
1 molar means usually 1 mass weight of the compound in 1 liter of solute.
here we are using it so measure energy flux or photon per square meter 
per second


another traditional measure of light energy is foot candles
1000ft-c is roughly 200 umol m-2 s-1

80 umol m-2 s-1 is the noon solar flux at 30 N lattitude
160 umol m-2 s-1 is the noon solar flux at the equator
what they are comparing is does it make much difference if the lights 
are on 12 hours or 16 hours
125 umol m-2 s-1 is about noon day sun in south florida

Greg Mortensen wrote:

>Chile-Heads:
>
>  I just picked up a copy of Paul Bosland's "Peppers: Vegetable and Spice
>Capsicums", and I have a question about superscript usage.  I'm certain
>that it has something to do with this book being published in the UK. (I'm
>in the USA.)
>
>  On page 61, it states "A solution of 2 g l-1 of potassium nitrate was
>successful in eliminating dormancy of C. annuum seeds."  I'm a bit unclear
>what the superscript "-1" is.  I read that line as "2 grams per liter"; is
>that right?
>
>  On page 127, it states "The typical volume of rockwool currently used is
>about 1.4 l m-2 of greenhouse area."  I read that as "1.4 liters per
>squared meter."
>
>  Lastly, on page 129 we have "Supplementary lighting of 125 umol m-2 s-1
>for 20h was only marginally better than the same intensity for 16 h."  I'm
>not even going to touch that one.
>
>  Perhaps some Briton can explain this superscript usage (especially the
>whole "-" thing); I tried asking one[1] here at work, but he was only
>able to tell me that "ladybugs are called ladybirds" (page 130).
>
>  Regards,
>    Greg
>
>[1] He also said "Greg, what's the difference?  You're just growing these
>things in a windowbox anyway!"
>
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