Sorry, premature send again…. “Finally, I goofed in stating…” should be:
I goofed in stating a saturation level for biochar of 50 kg/ha. Mea culpa, I meant 50 Mg biochar C/ha (only off by 1000x!). My reference for this rate is Chan et al., Australian Jour. Soil Research 2007, 45:629. I should have checked before pressing send. So my point is that biomass harvested from maize cultivation, used to produce biochar (assuming 10Mg aboveground CR produced /ha, 0.5 g biochar C yield/g CR C), and returned to a fraction of the soil at 50 t biochar C/ha, would saturate the soil in 35 years or less. My apologies for the errors. = Stuart = Stuart E. Strand 490 Ben Hall IDR Bldg. Box 355014, Univ. Washington Seattle, WA 98195 voice 206-543-5350, fax 206-685-9996 skype: stuartestrand http://faculty.washington.edu/sstrand/ -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To post to this group, send email to geoengineer...@googlegroups.com. To unsubscribe from this group, send email to geoengineering+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en.
