Variable Rate Liming - An Exercise in Kriging.
by
Paul Knight
NSW Agriculture

Linear mixed models have a area of application. One such application is spatial analysis. It is only possible to adopt such methods if there exists some underlying metric which links the data. The variance structure is a function of this metric that can be modelled using standard variogram models that exist in spatial statistics literature. In these setting it is possible to obtain predictions of new data, i.e. BLUPS, which in geostatistics is more commonly known as kriging.

An example consisting of 136 soil pH observations on an irregular grid over a 1 ha paddock will be used to demonstrate how a pH surface map can be produced using spatial prediction.

Date received: September 6, 2002