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Several fields have been identified in which detrimental soil compaction is suspected. The fields have been divided into 0.4 ha (1 ac) grid cells for the purpose of variable rate application and yield analysis. Multiple cone penetrometer readings have been collected and recorded in each cells to a depth of 700 mm. Precision deep tillage has been applied to depths up to 400mm in which CI is > 1.5 MPa. Crop yield data is compared with CI and NIR imagery to develop a preferred method of applying deep tillage in order to maximize net return.