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Soil Moisture Measurements with the Neutron Method Supplement Weighing Lysimeters¹

ABSTRACT

Evaluation of soil moisture changes with the neutron method agreed closely with that obtained from the weighing lysimeters. Evapotranspiration can be determined with either method by the equation ET = P - G - Q ± M where ET = evapotranspiration, P = precipitation, G = percolation, Q = surface runoff and M = change in soil moisture.

Differences were shown in the soil moisture extraction pattern under deep-rooted and shallow-rooted meadow crops. The hydrologic implications of this difference are discussed.

¹ Contribution from the Watershed Technology Research Branch, Agricultural Research Service, USDA, Coshocton, Ohio in cooperation with the Ohio Agr. Exp. Sta. Grateful acknowledgment is made of the assistance of R. E. Youker, T. L. Cullison, and W. W. Bentz in the collection and tabulation of the basic data.

² Analytical Statistician, Soil Scientist, and Supervisory Hydraulic Engineer, respectively.

Received for publication September 28, 1960. Accepted for publication May 25, 1961.