charcoal
Hi all,
After lurking some time, and enjoying the ng as a rich information source, time for a little contribution. 'The Secret of El Dorado' BBC Two, Thursday 19 December, 9pm text summary at: http://www.bbc.co.uk/science/horizon...eldorado.shtml "Bruno Glaser, from the University of Bayreuth, has found that terra preta is rich in charcoal, incompletely burnt wood. He believes it acts to hold the nutrients in the soil and sustain its fertility from year to year. This is the great secret of the early Amazonians: how to nurture the soil towards lasting productivity. In experimental plots, adding a combination of charcoal and fertiliser into the rainforest soil boosted yields by 880% compared with fertiliser alone." regards, Laurents |
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