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This article in SSSAJ

  1. Vol. 35 No. 1, p. 131-134
    Received: May 11, 1970
    Accepted: Nov 3, 1970

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Available Water as Related to Evapotranspiration Rates and Deep Drainage1

  1. D. E. Miller and
  2. J. S. Aarstad2



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.

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