Field calibration of a neutron-gamma probe in three agriculturally important soils of the Lower Macquarie Valley

McKenzie, D.C., Hucker, K. W., Morthorpe, L. J. and Baker, P. J. (1990) Field calibration of a neutron-gamma probe in three agriculturally important soils of the Lower Macquarie Valley. Australian Journal of Experimental Agriculture, 30 1: 115-122. doi:10.1071/EA9900115


Author McKenzie, D.C.
Hucker, K. W.
Morthorpe, L. J.
Baker, P. J.
Title Field calibration of a neutron-gamma probe in three agriculturally important soils of the Lower Macquarie Valley
Journal name Australian Journal of Experimental Agriculture   Check publisher's open access policy
ISSN 0816-1089
ISBN 0816-1089
Publication date 1990
Sub-type Article (original research)
DOI 10.1071/EA9900115
Volume 30
Issue 1
Start page 115
End page 122
Total pages 8
Language eng
Formatted abstract
A neutron-gamma probe was field calibrated in a grey clay, a grey-brown clay and a red-brown earth near Trangie, New South Wales. These are the main soils used for irrigated agriculture in this region. Accurate but simple calibrations and sampling procedure\ are required by commercial irrigators and researchers. 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. Calibration error generally was a smaller component of total error than location error, particularly where the combination equation was used. 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.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Public Health Publications
 
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Created: Wed, 04 Sep 2013, 15:25:50 EST by Peter Baker on behalf of School of Public Health