About Us | Help Videos | Contact Us | Subscriptions

Soil Science Society of America Journal Abstract -

A Field Study of Soil Water Depletion Patterns in Presence of Growing Soybean Roots: II. Effect of Plant Growth on Soil Water Pressure and Water Loss Patterns1


This article in SSSAJ

  1. Vol. 39 No. 3, p. 430-436
    Received: Apr 11, 1974
    Accepted: Jan 8, 1975

Request Permissions

  1. L. M. Arya,
  2. G. R. Blake and
  3. D. A. Farrell2



Soil-water pressure and water-loss patterns in the root zone of soybean (Glycine max L.) genotype P.I. 79.648 were determined from daily observations during irrigation-drying cycles for four growth periods after planting. Tensiometric measurements of soil water pressure were made on a 10-cm square grid from one plant row to an adjacent one spaced 80 cm apart, and between 10- and 70-cm depths. Water contents were inferred from pressure-water content relationships.

During the first irrigation-drying cycle, soil-water pressures were marked by strong lateral and vertical gradients. As plants aged from one irrigation-drying cycle to the next, these gradients decreased; soil-water pressures at most depths decreased more slowly with the drying time. The proportional contribution of surface layers to the total water loss from the 10- to 70-cm depth interval decreased as the plants matured while contributions from the lower layers increased. These changing patterns of soil-water pressure and water loss are consistent with the expected shift in root activity.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America