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The Resistance of Intact Maize Roots to Water Flow¹

ABSTRACT

Using a novel tensiometer-potometer system the relationship between the root resistance to water flow of maize and the water potential of the root tissue has been examined. Over the range of water potentials used a linear relation has been observed in contrast to previous observations. Calculations using published data indicate that the rhizosphere resistance is of the same order of magnitude as the root resistance when the soil moisture potential of the rhizosphere is about –1 to –2 bars.

¹ Contribution from the Department of Soil Science & Plant Nutrition, University of Western Australia, Nedlands, Western Australia 6009.

² Lecturer, Department of Agronomy & Soil Science, Univ. of New England, Armidale, N.S.W., Aust.

³ Senior Lecturer, Department of Soil Science & Plant Nutrition, Univ. of Western Australia, Nedlands, Western Australia 6009.

⁴ Professor, Waite Agricultural Research Inst., Univ. of Adelaide, South Australia.

Received for publication May 8, 1975. Accepted for publication December 22, 1975.