You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Method of Estimating the Total Length of Root in a Sample
E. I. Newman
Journal of Applied Ecology
Vol. 3, No. 1 (May, 1966), pp. 139-145
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/2401670
Page Count: 7
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
The roots are laid out on a flat surface, and a count is made of the number of intersections between the roots and random straight lines. Then the total root length = πNA/2H, where N is the number of intersections, A the area within which the roots lie, and H the total length of the straight lines. Details are given of a technique in which a microscope hair-line provides the straight lines. In practical tests the method was compared with direct measurement, and with direct measurement of a sub-sample followed by weighing of the sub-sample and the remainder. The results from the different methods agreed well. The line intersection method was much quicker than direct measurement, and in a given time achieved higher precision than measurement of a sub-sample and weighing.
Journal of Applied Ecology © 1966 British Ecological Society