Measuring soil water content and evaporation by the neutron scattering method.

Authors

  • J.W. Holmes

DOI:

https://doi.org/10.18174/njas.v4i1.17769

Abstract

The calibration curve used for converting field measurements of counting rate into water-content values was obtained in principle from neutron transport theory, using the "Fermi age" treatment of the slowing down of fast neutrons. Measurements were made at vertical intervals of 30 cm at depths of 30-180 cm at different dates over 5 months. Measurements were not made between o and 30 cm depth as experiment showed that the size of the sampling volume scanned by the neutrons resulted in errors at water contents below about 0.13 g/cc. Water-content profile curves were constructed, and evaporation obtained by measuring the areas between curves and adding the figures for precipitation in the same period. A graph of the accumulative evaporation is presented, the evaporation as calculated by Penman's method being also shown. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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Published

1956-02-01

Issue

Vol. 4 No. 1 (1956)

Section

Papers

License

© Copyright KLV All rights reserved. The copyright covers the exclusive right to reproduce and distribute the contribution, including reprints, translations, photographic reproductions, microform, electronic form (offline, online), or any other reproductions of similar nature. The Author may publish his/her contribution on his/her personal Web page provided that he/she creates a link to http://library.wur.nl/ojs/index.php/njas and that together with this electronic version it is clearly pointed out, by prominently adding "© KLV", that the copyright for this contribution is held by KLV. The full-text version may be available from the Author's Web page only after a delay of 12 months following the publication of the paper, whereas such a delay is not required for the abstract.