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This article in AJ

  1. Vol. 61 No. 3, p. 474-475
    Received: July 5, 1968

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Root Air Measurements by a Pycnometer Method1

  1. C. R. Jensen,
  2. R. J. Luxmoore,
  3. S. D. VanGundy and
  4. L. H. Stolzy2



The air space fraction, or porosity, of plant roots is important to their internal aeration. Root porosity can be calculated from the following measurements: the weight of a sample of the roots in a pycnometer bottle filled with water; the weight of the root sample alone; the weight of the homogenate after ball milling the sample; and the weight of the bottle filled with water only. Results are variable and a mean of 10 samples must be obtained.

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