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Title:   Author  item
                                            Gish, Timothyitem
                                            Daughtry, Craigitem
                                            Dulaney, Wayneitem
                                            Walthall, Charlesitem
                                            KUNG, K.J. - UNIV. WI, MADISONitem
                                            BUSS, P. - SENTEK CORP, AUSTRAILIA
  Submitted to: American Society of Agronomy Meetings
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 7/18/2001
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: Fundamental watershed-scale hydrologic processes governing chemical transport through soil to neighboring ecosystems are so poorly understood that strategies for mitigating chemical contamination cannot be accurately formulated. The major limitation to quantifying chemical transport at the field and watershed scale is an accurate characterization of the subsurface eflow processes, including preferential flow. Ground-penetrating radar data was used to identify the subsurface convergent flow pathways on four small watersheds, USDA-ARS, BARC. The spatial distribution of corn grain yields, remote sensing, real-time soil moisture monitoring, and surface soil cores were used to evaluate and confirm the location of the GPR-identified flow pathways. Soil moisture observations near the GPR-identified flow pathways support the existence of funnel flow. Under water-limiting conditions high corn grain producing regions were poorly correlated with surface soil  texture, organic matter, P and K spatial concentration distributions. However, superimposition of the subsurface convergent flow pathways with the high yielding corn regions on a CIR image suggest that funnel flow processes do influence yield.  As a result, a sampling strategy based primarily on ground-penetrating radar may be useful in identifying subsurface convergent flow pathways.


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