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Abstract

 

This article in SSSAJ

  1. Vol. 48 No. 2, p. 233-237
     
    Received: May 16, 1983
    Published: Mar, 1984


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doi:10.2136/sssaj1984.03615995004800020002x

Root Water Uptake and Soil Water Distribution: Test of an Availability Concept1

  1. R.J. Lascano and
  2. C.H.M. van Bavel2

Abstract

Abstract

An experimental test was made of the hypothesis that the fractional water uptake by the root system from a soil layer is proportional to the root density and to the difference between the water potential in that layer and the mean leaf water potential. This theory adequately explained the water uptake by a cotton root system that was divided over a wet and a dry soil compartment. It was also established that the absolute rate of water uptake from each compartment could be accurately calculated from the measured potential difference between soil and plant leaf, and from a separately measured plant hydraulic resistance, which was shown to have a value of 0.67 × 109 s, independent of transpiration rate.

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