Access tubes are located in Tully soils. Soil moisture is taken every two weeks from April 1 through November 1. Measure for standing water in the tube with the meter stick. Adjust the depth measurements accordingly so the probe will not be inserted into water. After the lowest depth raise the probe into the unit and latch in place with the release pin.
Press start button.
When the count stabilizes, record ending count and time. If all sites cannot be measured the same day, record a new beginning and ending standard count on the field form. If recommended procedures are followed and the unit is not abused, operating the neutron probe is not hazardous. Carry the unit away from the body to minimize any possible radiation exposure. Make sure the probe is firmly latched in the unit before removing from the access tube.