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Agronomy Journal Abstract -

A Retractable, Neutron-Probe Access Tube1


This article in AJ

  1. Vol. 72 No. 6, p. 1067-1068
    Received: Oct 26, 1979

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  1. D. M. Glenn,
  2. R. L. Henderson and
  3. F. E. Bolton2



Soil moisture measurements with a neutron-probe moisture meter provide a rapid and non-destructive means for measuring soil water in long-term studies. The inability of farm machinery to pass over the extended access tube limits its use in some situations. A retractable, neutronprobe access tube was designed to allow implement passage at the normal speed and tillage depth without contacting the access tube.

This design has been used for soil-moisture studies in a fallow-crop rotation in which 6 to 10 tillage operations, including planting, have been performed over the access tubes. It has worked well with disks, sweeps, harrows, chisels, and deep-furrow planters.

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