Instrumental and soil moisture variance using the neutron-scattering method. Hewlett, J. E. D. & J. L. Clutter, J. D. 1964.
Instrumental and soil moisture variance using the neutron-scattering method. [pdf]Paper  abstract   bibtex   
The variance in estimates of soil moisture as determined by the neutron-scattering method is examined and related to field data from two research areas. Instrument and timing errors are shown to contribute insignificantly to the standard error of estimate. Furthermore, their contribution to estimates of moisture change with time is negligible as long as the timing interval used at each observation exceeds 30 seconds.

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