Field calibration of a neutron-gamma probe in three agriculturally important soils of the Lower Macquarie Valley [New South Wales].
1990
McKenzie D.C. | Hucker K.W. | Morthorpe L.J. | Baker P.J.
A neutron-gamma probe was field calibrated in a grey clay, a grey-brown clay and a red-brown earth. Bias in the estimation of soil water content was minimised by using separate calibrations for each soil and depth where equations were significantly different. Precision tended to be higher where an equation combining all depths and soils was used, but the introduction of large bias at some depths suggests that soil-specific equations should be used where possible. The errors associated with commercial sampling methods are discussed. The relationship between gamma count rate ratio and soil wet bulk density was poor, particularly in the grey and grey-brown clays, and this technique was considered to be inadequate for the measurement of bulk density in the field.
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