LaMotte AST Series Professional Soil Test Outfits - Manual (Page 17)

PROCEDURE
Read Use of the Octa-Slide Viewer on page 5 before proceeding.
1.
Fill a test tube (0106) to 5 mL line with soil extract.
2. Dilute to 10 mL line with *Mixed Acid Reagent (V-6278).
3. Use the 0.1 g spoon (0699) to add 2 measures of *Nitrate Reducing
Reagent (V-6279). Cap and invert 50-60 times in one minute to
mix. Wait 10 minutes.
NOTE: At the end of 10 minutes an undissolved portion of
*Nitrate Reducing Reagent may remain in the test tube. This will
not affect test results.
4. Invert the sample once to mix. Insert test tube into the Octa-Slide
Viewer (1100). Slide the Nitrate Nitrogen Octa-Slide Bar (3422)
into viewer. Match sample color to a color standard. Record as
lb/acre Nitrate Nitrogen.
NOTE: If sample color is darker than the highest color standard,
the sample must be diluted (see Sample Dilution Techniques,
page 7) and the test repeated.
17