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9.
Microwave the cup and soil for 2 minutes, then stir. Weigh again.
CAUTION
: the bowl
will be hot. Repeat this step until there is no further change in weight. Record the final
weight.
10.
Use this weight difference divided by the sample cylinder volume (for example 33.5 ml)
to calculate the volumetric moisture content. The difference in sample weight is due to
the moisture that was boiled off from the sample.
Example Calculation
Initial Weight: 368.7 g, Final Weight: 362.8 g
Difference: 368.7 g - 362.8 g = 5.9 g = 5.9 ml
Volumetric Moisture Content = 5.9 ml / 33.5 ml = 0.176 ml/ml = 17.6 %
Important Notes
•
Remember, for large soil containers, you should do at least three samples equally
spaced along the soil box, then average the results together.
•
When finished all measurements, return the soil samples to the soil box and mix in well.
