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Notes: Std, standard deviation; Min, minimum; Max, maximum; CV, coefficient of variation; N, number of observations.

Notes: Std, standard deviation; Min, minimum; Max, maximum; CV, coefficient of variation; N, number of observations.

elevated ECa values greater than 200 mS/m and corresponding low yield values below 600 kg/ha (Figure 20.2).

The map produced from the ECa data (Figure 20.2a) is much more detailed than a standard soil survey. This information was used to explore variability within potential research plots to be laid out across the Montana field underneath a newly installed linear move sprinkler system. Figure 20.3a shows the eight east-west tire tracks for the linear system. The Montana field was divided into nine plots (85 m wide and 378 m long) called Ml to M9, with each plot further divided into seven subplots. Mean soil ECa and yield values from each of the nine Montana plots are shown in Figure 20.3b, with their corresponding CV values shown in Figure 20.3c. Two important observations may be made from Figure 20.3.

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