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manure and weeds



Does anyone have the scoop of why chicken litter 
stimulates weeds when applied to pastures
?  I have heard that the manure itself contains 
weed seed because lower grade soymeal fed to 
chickens contains weed seed.  I find this hard to
beleive since a chicken has a gizzard equipped
to digest weed seed.  I have also heard that
the ammonia contained in the litter stimulated
weed seed germination or that it is simply a
 nitrogen response.  Does anyone have any definitive
answer as to what the process actually is?