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Mapping soil fertility at Broom's Barn by simple kriging
Author(s) -
Webster Richard,
McBratney Alexander B.
Publication year - 1987
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740380203
Subject(s) - broom , kriging , topsoil , environmental science , mathematics , geostatistics , soil science , soil fertility , barn , statistics , spatial variability , soil water , geography , ecology , biology , archaeology
Simple kriging is a technique for estimating values of continuous random spatial variables from data without bias and with minimum variance. The procedure is illustrated by a case study in which three properties of soil fertility, available phosphorus, exchangeable potassium and pH in the topsoil, are mapped using data from Broom's Barn Experimental Station. The soil on the station, covering 77 ha, had been sampled at 40‐m intervals. Semi‐variograms of the properties were determined from the measurements and kriged values estimated at 10‐m intervals on a square grid. These values were then contoured to produce maps of the properties and also reliability maps showing the estimation variances.