Air dry moisture content (2A1)

This method is required to adjust soil chemical results based on air-dry samples to an oven-dry (105^oC)
basis. When the air-dry moisture content (M%) is known, the correction from air-dry
to oven-dry is as follows:

            Oven-dry result  =   [Air-dry result  x  (100+ M%)]/100

AD-09

Dry ashing without HF, and uptake in HCl.  AAS-Flame finish, without background correction, and using air acetylene.

GE-30

Wet digestion - open system without HF, and final medium H₂SO₄ (includes Kjeldahl - not quantitative for NO₃).  Spectrophotometry (manual) finish.