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In-field Variability of Terrain and Soils in Southeast Kansas: Challenges for Effective Conservation
1G. F. Sassenrath, 2T. Mueller, 1D. Shoup, 3V. J. Alarcon, 4S. E. Kulesza
1. Kansas State University
2. John Deere Company
3. Universidad Diego Portales
4. Dept Civil Engineering, Kansas State University

A particular challenge for crop production in southeast Kansas is the shallow topsoil, underlain with a dense, unproductive clay layer. Concerns for topsoil loss have shifted production systems to reduced tillage or conservation management practices. However, historical erosion events and continued nutrient and sediment loss still limit the productive capacity of fields. To improve crop production and further adoption of conservation practices, identification of vulnerable areas of fields was performed using publicly available high imagery products and terrain maps. The information can be used to develop protocols for alternative management to protect vulnerable areas and reduce topsoil loss. Yield and plant growth information were collected at harvest from production fields. Additional measurements of soil electrical conductivity further delineate soil variability. Although fields commonly have only a moderate slope (1–3%), calculation of surface curvature indicates areas of fields at higher elevations that often coincide with areas of thin vegetation, indicating high erosion losses. DEM analysis revealed areas within fields that held water and areas of high potential runoff where soil loss was likely. Transitioning to conservation management practices such as reduced tillage and use of cover crops may improve the soil microenvironment and enhance the long-term sustainability of the agronomic production system. Implementing precision management practices could also improve net return by reducing inputs on regions with low productive capacity.

Keyword: soil erosion; claypan; electrical conductivity; terrain analysis