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Recording Soil Moisture Automatically¹

ABSTRACT

A method utilizing nylon blocks and an automatic recording potentiometer equipped to record resistence by means of a special ohmmeter circuit was used to follow continuously the moisture content of the soil. The information obtained was used in correlation with rainfall data to estimate the time required for water to reach various depths in the soil.

The results show that water moved downward more rapidly on a watershed where conservation practices were used than on a prevailing farm practice watershed.

An automatic instrument of the type used in this work that follows soil moisture conditions would be of great value in many research problems.

¹ Journal Paper No. 688, Purdue University Agricultural Experiment Station, Lafayette, Ind. Contribution from the Department of Agronomy. Presented before Division I, Soil Science Society of America, Cincinnati, Ohio, Nov. 19, 1952.

² Agronomist with the Farm Clinic of the United States, formerly graduate assistant at Purdue University, and Soil Scientist respectively. Acknowledgment is gratefully made to R. B. Hickok and N. L. Stoltenberg of the Soil Conservation Service at Purdue for their help and to the Purdue University School of Mechanical Engineering for the use of their instrument.

Received for publication February 11, 1953.