Miami-Dade County Superintendent Alberto Carvalho announces Miami-Dade schools will be closed on Monday due to Tropical Storm Isaac. MIAMI (CBSMiami) â Miami-Dade County Schools superintendent Alberto Carvalho announced Saturday that all classes have been canceled for Monday, August 27.
Biochar is charcoal used as a soil amendment. Like most charcoal, biochar is created by pyrolysis of biomass. Biochar is under investigation as an approach to carbon sequestration to produce negative carbon dioxide emissions. Biochar thus has the potential to help mitigate climate change, via carbon sequestration.re-Columbian Amazonians are believed to have used biochar to enhance soil productivity. They produced it by smoldering agricultural waste (i.e., covering burning biomass with soil) in pits or trenches. European settlers called it terra preta de Indio.
Origin of Biochar - Terra Preta. The technique of using charcoal to improve the fertility of soils originated in the Amazon basin at least 2500 years ago. The native Indians of the region would create charcoal and incorporate it in small plots of land from 1 - 80 hectares in size. Terra Preta, as it is known in this area of Brazil, remains highly fertile until today, even with little or no application of fertilizers. And this is in a region of the world known for its highly infertile soils. Cross section of soil 1 meter deep comparing Terra Preta on the left, with nearby Oxisol on the right of the type that is normally found in the Amazon basin. [Glaser, B., Haumaier, L., Guggenberger, G., and Zech, W. (2001).