LaMotte SMART3 Soil Operator's Manual page 79

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ELECTRONIC TEST METHODS
 pH
PROCEDURE
1. Use the 10 g Soil Measure (1164) to add one level measure of the soil sample to a
50 mL beaker (0944). Use the graduated cylinder (0416) to add 10 mL of deionized
water. Stir thoroughly.
2. Let stand for at least 30 minutes, stirring two or three times.
3. Stir mixture just prior to making the pH reading. Determine the pH reading of the
sample by following the instructions for the pH Meter.
 LIME REQUIREMENT - WOODRUFF METHOD
PROCEDURE
1. Use the 10 g Soil Measure (1164) to add one level measure of the soil sample to a
50 mL beaker (0944). Use the graduated cylinder (0416) to add 10 mL of deionized
water. Stir thoroughly.
2. Let stand for at least 15 minutes.
3. Add 20 mL of Woodruff Buff er Solution (5272). Mix well, and let stand for at least 20
minutes, stirring two or three times.
4. Take reading using the pH meter. Stir mixture just prior to making reading.
5. Each 0.1 pH unit drop from pH 7.0 indicates a lime requirement equivalent to 1000
lbs calcium carbonate (CaCO
SMART3 Soil Colorimeter 9.18
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15
10 20
5 25
0 30
)/acre.
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