Development of in Situ Quantification of Soil Structure: Methodology and Analysis.

There is still a lack of a non-subjective system to quantify soil structural properties in situ. Quantitative soil structure metrics would be highly beneficial not only for assessing soil health but also for optimizing biophysical models. A field method is needed so that the effects of land management can be quickly quantified. Currently, methods and analysis quantifying soil structure of intact sample completed in the lab has been investigated and successful. The research objective is to develop a method that can be done quickly and accurately in the field to identify and quantify structure using 3D scanning technology. Once the method is solidified the metrics will be used in linking changes in soil condition or health to changes in management practices. Preliminary work has been completed to create a field protocol for collecting the scan data, and results of a field trial will be presented. Scans of soil surface horizons were collected at several sites across the Texas Blackland Prairies. Measurements of soil texture, bulk density, and other soil properties were also taken for analysis with the scans. Sites under conventional till, no till, and pasture conditions were assessed. For each land management category, three repetitions at sites under different ownership were completed. The metrics acquired through scanning and correlation with other soil properties will be used to link changes in land management with changes in soil structure and overall changes in soil health.