LaMotte STH Series - Manual (Page 8)

Nitrate Nitrogen
The role of nitrogen in plant nutrition is discussed in the LaMotte
Soil Handbook. For interpretation of test results see the LaMotte
Soil Handbook and page 22 of this manual.
Procedure:
1. Use a 1 mL pipet (0354) to transfer 1 mL of the general soil
extract to one of the larger depressions on a spot plate (0159).
2. Add 10 drops of *Nitrate Reagent #1 (5146).
3. Use a 0.5 g spoon (0698) to add one level measure of *Nitrate
Reagent 2 Powder (5147).
4. Stir thoroughly with a clean stirring rod (0519). Allow to
stand five minutes for full color development.
5. Match sample color with the Nitrate Nitrogen Color Chart
(1315). Record as pounds per acre nitrate nitrogen.
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