Plant and Soil

, Volume 85, Issue 2, pp 153–162 | Cite as

Constricted growth of grass roots through rigid pores

  • D. Scholefield
  • D. M. Hall
Article

Summary

An examination of the mechanical interaction between elongating roots and rigid pores of precisely known size is reported. Sheets of steel mesh and glass capillaries were used as systems of rigid pores. The roots of grasses were found to be capable of penetrating pores much smaller than their nominal thickness, this capability being limited by the size of the root cap and the stele. Constricted root tips elongated at a slower rate but could grow down long capillaries if adequately aerated. The size of rigid pore critical to the growth of perennial ryegrass was 315 μm.

Key words

Constricted roots Grasses Impedance Rigid pores Root elongation Soil structure 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Abdalla A M, Hettiaratchi D R P and Reece A R 1969 The mechanics of root growth in granular media. J. Agric. Eng. Res. 14, 236–248.CrossRefGoogle Scholar
  2. 2.
    Aubertin G M and Kardos L T 1965 Root growth through porous media under controlled conditions: 1. Effect of pore size and rigidity. Soil Sci. Soc. Am. Proc. 29, 290–293.Google Scholar
  3. 3.
    Goss M J 1977 Effects of mechanical impedance on root growth in Barley (Hordeum vulgare L.). J. Exp. Bot. 28, 96–111.Google Scholar
  4. 4.
    Kay S J, Nicklow C W and Simons D H 1974 Ethylene in relation to the response of roots to physical impedance. Plant and Soil 40, 565–571.Google Scholar
  5. 5.
    Russell R S and Goss M J 1977 Physical aspects of soil fertility — The response of roots to mechanical impedance. Neth. J. Agric. Sci. 22, 305–318.Google Scholar
  6. 6.
    Veen B W 1982 The influence of mechanical impedance on the growth of maize roots. Plant and Soil 66, 101–109.Google Scholar
  7. 7.
    Whiteley G M, Utomo W H and Dexter A R 1981 A comparison of penetrometer pressures and the pressures exerted by roots. Plant and Soil 61, 351–364.Google Scholar
  8. 8.
    Wiersum L K 1957 The relationship of the size and structural rigidity of pores to their penetration by roots. Plant and Soil 9, 75–85.CrossRefGoogle Scholar

Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1985

Authors and Affiliations

  • D. Scholefield
    • 1
  • D. M. Hall
    • 1
  1. 1.The Grassland Research InstituteMaidenheadUK

Personalised recommendations