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#2
08-26-2013, 05:06 PM
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These might help
http://www.canreef.com/vbulletin/showthread.php?t=95386 http://www.angelfire.com/ab/rayjay/phyto.html and this is an excellent read http://www.fao.org/docrep/003/W3732E/w3732e00.htm 
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