[Terrapreta] urine & terra preta

[David Yarrow]

in trying to understand how the indigenous amazon tribes made terra preta, how about careful consideration of the value of urine as a fertilizer:
http://www.world-science.net/othernews/071007_fertilizer-urine.htm

in addition to its immediate fertility value, i suspect urine has special value as a microbial stimulant

David Yarrow
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