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18 bytes added, 06:59, 15 December 2012
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*'''agricultural leftovers:''' straw, rice hulls, corn stalks, chicken/cattle poop
*'''fastFast-growing biomass:''' bamboo, switchgrass, miscanthus, *'''otherOther:''' leaf litter, grasses, macroalgae, bones (high P content),
=== Criticism ===
== Terra preta ==
'''[[Terra preta''' ]] is a type of very dark, fertile anthropogenic soil found in the Amazon Basin. It is basically a mixture of charcoal, bone, and manure. It is very stable and remains in the soil for thousands of years.
== External links ==
{{attrib wiki|wikiname=Open Source Ecology|link=[ Biochar]|license=[ Creative Commons Attribution-Share Alike 3.0 United States License.]}}

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