Abstract
Soil compaction can restrict root growth and water infiltration, resulting in yield reduction. Maps of yield monitordata aid in visualization of variations in yield, without identifying underlying factors for these variations. Soil penetrationresistance can help identify areas where soil physical characteristics are negatively impacting yield. However, penetrationresistance is a function of soil moisture content and soil type as well as compaction. A standard penetrometer cone was modifiedto collect near-infrared reflectance and estimate moisture content. The instrument was tested in the laboratory on a selectionof soil types with varying moisture tension levels using stepwise and continuous probe insertions. Soil moisture, dry bulkdensity, and clay content were significant variables in predicting soil cone index at the lower moisture tension level.
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