HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Miller, D. E. Articles by Aarstad, J. S. Search for Related Content PubMed Articles by Miller, D. E. Articles by Aarstad, J. S. Agricola Articles by Miller, D. E. Articles by Aarstad, J. S.

Available Water as Related to Evapotranspiration Rates and Deep Drainage¹

ABSTRACT

Soil water movement following irrigation was evaluated for different rates of evapotranspiration and depths of irrigation in laboratory systems. Downward flow of soil water decreased as evapotranspiration rate increased. Under usual summer environmental conditions, evapotranspiration reduced deep drainage sufficiently to allow reasonable estimates of actual available water to be made from conventional field capacity data. Better estimates were obtained by adjusting sampling time according to expected evapotranspiration rates and the soil depth to be involved. The data show that large errors are probable in field measurements of evapotranspiration rates if deep drainage is ignored.

¹ Contribution from the Soil and Water Conservation Research Division, Agricultural Research Service, USDA, in cooperation with the College of Agriculture, Washington State Univ., Pullman. Scientific Paper no. 3450.

² Research Soil Scientist and Soil Scientist, USDA, Prosser, Washington.

Received for publication May 11, 1970. Accepted for publication November 3, 1970.