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Repeat the above process, increasing the moisture by approximately 5% for each step, until a
saturated soil is achieved. Seven to eight moisture levels should be used.
When all the data is collected, chart the results, and then apply a polynomial fit to the data
points to establish the soil calibration coefficients.
Equipment Required
Soil that is being calibrated, initially dried to less than 5%, should have a sufficient amount to
fill the soil box:
Basic Equipment
•
A soil container / box
•
Plastic Sheeting: to cover soil (to minimize loss of moisture due to evaporation), and if
necessary to line the soil container
•
Spray Bottle: used to evenly apply water to the soil
•
Hand Trowel: for mixing and preparing soil
•
Graduated Cylinder: to measure the amount of soil to add
•
Plastic Scraper / Wooden Tongue Depressors: useful to scrape soil off gloves, probes,
etc
