How do you "malt" barley?  I have whole grain barley and need to malt
some for sourdough bread.

Hi! Thanks for the question.

I have found the following webpages which provides an explantion of
malting barley.

Our first link provides an overview and a simplistic discussion of the
malting process of barley.

"MALTING PROCESS IN A NUTSHELL"
http://hbd.org/brewery/library/Malt.html

A more detailed discussion plus the basics of malting barley could be
find in our next articles.

"Malting Barley"
http://www.crc.dk/flab/newpage11.htm

"Malting Process"
http://www.crc.dk/flab/malting.htm

"Fermentation"
http://www.crc.dk/flab/fermenta.htm

"Maturation"
http://www.crc.dk/flab/newpage12.htm

Please read the additional information supplied in each page. it will
provide a more detailed discussion of this process.

In case you would like to make a barley sourdough bread, I was able to
find a recipe.

"Barley Sourdough Bread"
http://www.albertabarley.com/newpage/publications/barley_country/feature/fall_2000_004.html

Search terms used:   
barley malting process   
"malted barley" "sourdough bread"
      
I hope these links would help you in your research. Before rating this
answer, please ask for a clarification if you have a question or if
you would need further information.
      
Thanks for visiting us.       
      
Regards,       
Easterangel-ga       
Google Answers Researcher

Thanks for the solid and complete research.  You went the extra mile
with the sourdough recipe, though I've never seen a recipe quite like
it.

It's a long process, and can go wrong if moulds attack the barley:
http://www.specialtymalts.com/maltster/faq_malt_prod.html

Thanks for awesome link, should have thought of Cargill...try French
Postcards posted a few minutes after this.  Thanks again.

Go to www.grainscanada.gc.ca and ask someone at the Canadian Grain
Commission to answer your question. Or go to a company called Praire
Malt in Saskatchewan Canada and ask them.