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Establishing Management Classes for Broadacre Agricultural Production

Australian Centre for Precision Agriculture, McMillan Building, A05, The Univ. of Sydney, NSW 2006, Australia

View larger version (20K): [in this window] [in a new window]   Fig. 1. Histograms and boxplots of (a) raw wheat yield data from 2000 (Mg ha–1) (top left), constrained to sensible thresholds (top center) and trimmed using 2.5 (left tail) and 2.5 (right tail) SDs (top right) and (b) EM31 raw data from 2004 (mS m–1) (bottom left), trimmed of two low values (bottom center) and trimmed to ±2.5 SDs (bottom right).

View larger version (32K): [in this window] [in a new window]   Fig. 2. Screenshot of the comma separated output file generated by GEOD (v3.42) showing the input in geographic coordinates (GDA94) in the first two columns and the corresponding output in Cartesian coordinates (UTM MGA94 Zone 56) in the last two columns. The center (third) column is the yield value.

View larger version (38K): [in this window] [in a new window]   Fig. 3. Example of irregular spaced yield data (round dots) overlain with a regular square (5 m) grid (crosses). Interpolation transforms the raw data into predicted values at the grid nodes.

View larger version (30K): [in this window] [in a new window]   Fig. 4. An example of the graphical output from VESPER showing the pattern of the predicted variable (wheat yield 2004) (left) and the map of kriging SD (right). Screenshot is shown in black and white; however, VESPER output is in color.

View larger version (78K): [in this window] [in a new window]   Fig. 5. Interpolated maps of all data layers available for analysis. Maps are presented using a common legend based on SDs.

View larger version (35K): [in this window] [in a new window]   Fig. 6. Maps of potential management classes derived from fuzzy k-means cluster analysis using the shareware FuzME. Examples of two, three, four, five, and six classes are shown.

View larger version (27K): [in this window] [in a new window]   Fig. 7. The two management class map overlain with the stratified soil sample locations in 2001 and 2004.