A 5 gram NCR-13 volumetric scoop of soil is placed into a tared, Kimax beaker, and is dried for 2 h at 105 degrees Celsius and weighed. The sample is then ashed for 2 h at 360 degrees Celsius and reweighed. The resulting loss of weight, as a percentage of the dry soil, is the estimate of organic matter content.
(Ref. No. 9 - Method References)