Quote:
Originally Posted by redgreenblue
If my calculations are correct, then that's between 14.7 and 50.6 kg of char per m3... it definitely seems like a lot...
147 to 506 tonnes = 147000 to 506000 kg
1 ha = 100m * 100m = 10000 square meters
147000/10000 = 14.7kg/m3
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Clay mineral soils in the USA weigh about 1.1 times water. Organic soils (TP?) weigh less, coarse soils (sands) weigh more in the 1.5 - 1.6 range. Above 1.7 is compacted soil. Water weighs 1 gm/cc.
A cubic meter of water weighs a tonne (handy that if correct - check my math!). That puts 14.7 kg/cubic meter at 1.47% by weight. Not my area of knowledge, but that seems like a lot for a ferrasol soil.
I have been wondering about those 20% C numbers though. One source of confusion is if the author slips and is thinking Organic Matter but writes Organic Carbon. OM is 1.5 to 2.0X OC. It is supposed to be calibrated regionally, but calibration is demanding so labs often use 1.724 as a default. On the other hand, high organic matter soils weigh less per soil volume so maybe 20% C makes sense.
