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Re: JoAnn's plant nutrient experiments
Wow, Steff! Thanks!
Sodium nitrate it is, then. Sounds straightforward
enough; I didnít want to get into that
add-this-compensate-with-that if I didnít have to.
Gets pricey. *grin*
Good point about the ion concentration. Admittedly
itís fine-tuning, but itís also good math practice as
well as a springboard for chemistry discussions. To
say nothing of it being better lab practice. ;)
Finally, nitrate salts are all pretty reactive. Be
Not to worry. Iím pretty fussy about lab safety. :)
Good idea about making stock solutions. Measuring all
those individual portions would indeed be a major
Us geeks call this kind of single dose an "aliquot,"
which we also use as a verb
Aliquot, eh? I remember *hearing* the word a few
times, lol! How on earth do you use it as a verb?
Iíll have to work on using Ďaliquotí since Iím a geek,
too, and I wouldnít want to make a geek faux-mot. ;)
Iím an engineering geek, though, not a science geek,
so maybe Iíd be forgiven.
Would you measure growth by length, number of leaves,
*grin* That is one of the questions I intend to ask
the kids. Iím betting they wonít have thought about
just what they mean by growth. ;) I thought Iíd let
them decide, maybe even have them measure multiple
parameters and see if one measurement is a Ďbetterí
indicator of growth/health (in their estimation) than
another. Lots of interesting questions there: would
length be a good measure of growth in a multi-branched
plant? How do you account for dropped leaves? Yadda,
Thanks for the guidance on slowing the algae
infection. I hadnít given enough thought to that one.
Starting Ďcleaní should give us enough time to get
through the experiments before the algae take over. I
donít have to grow them forever, lol!
Replicates! Duh! [slapping forehead] I can only hope
that would have occurred to me before we started.
Sheesh! See why I need some input on this?
Thanks so much for your help, Steff! I appreciate you
taking the time to read and think about the
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