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Some Empirical Relations of Soil-Moisture Tensions¹

ABSTRACT

An analysis was made to compare methods of designating soil mositure tension for an entire irrigation season. Using the field data from a sugar-beet irrigation experiment, seasonal values for soil-moisture tension at a given depth were calculated as a simple mean of all readings, and as a mean of the tensions just prior to each irrigation. These values were found to correlate closely with mean tensions calculated similarly to Taylor's mean integrated tension for a single depth. Yields were found to correlate equally well with either mean integrated tension or the mean of tensions prior to irrigation. Under soil and growth conditions encountered, no advantage was found in using mean integrated soil-moisture tension or the arithmetic mean of all readings, in preference to the simpler mean of pre-irrigation tensions.

¹ Published with approval of the Director, Wyoming Agr. Exp. Sta. as Journal Paper No. 37. Presented before Div. I, Soil Science Society of America, Dallas, Tex., Nov. 18, 1953.

² Assistant Agricultural Engineer, Agri. Exp. Sta., University of Wyoming.

Received for publication December 7, 1953.