[APD] Some stuff on N and other nutrients

["Thomas Barr" <tcbiii at earthlink_net>]

Some people were discussing the role of N and P in relation to aquatic
plants and wanted some more in depth reading/background:

Here's a few diagrams from UC Davis and some general test questions. 
http://www.users.nac.net/challoran/LDrxn.htm 

N cycling: 
http://www.nstl.gov/research/nitrogen/ncd.html 
http://www.botany.ubc.ca/biol351/351f.htm 
http://www.acad.carleton.edu/curricular/BIOL/classes/bio359/study%20guides/n
utrient%20uptake/12nutruptake2.html 

And here's a good one for you for NH4 and NO3 assimlation and rates etc: 
http://www.hort.purdue.edu/rhodcv/hort640c/nuptake/nu00001.htm 

This is a good site for some of the comments on lakes and plants: 
http://www.utoronto.ca/env/jah/lim/lim05f99.htm 

Note Mn and NO3. 

Here's something that might bother you also about high CO2 and NO3 
http://www.plantphys.net/article.php?ch=e&id=158 

You read all that, and you'll have a good understanding about plant biochem
or a headache:-) Seriously, there are good info in each one of these sites. 
These will help understand and argue for various observations in aquatic
plants not just with N or P, but also with K, CO2 etc. 
While we often want to narrow things down to one nutrient etc, it's very
often several. 

So for folks that want to bite off a little more and know plants inside and
not just their names, there's a little reading.
The site from Purdue is good.

Regards, 
Tom Barr


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