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A Retractable, Neutron-Probe Access Tube
- D. M. Glenn, R. L. Henderson, F. E. Bolton
- Agronomy journal 1980 v.72 no.6 pp. 1067-1068
- crop rotation, fallow, harrows, neutron probes, planters, planting, soil water, tillage
- 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.