Agricultural chemical presence in groundwater has drawn attention towards transport processes occurring in soil. Hydraulic conductivity (K) and water holding capacity of a soil have great influence on water flow and solute transport. However, much of the chemical transport to groundwater can occur through preferential flow pathways. The simplified, preferential flow, mobile/immobile model partitions the water content () into mobile (_m) and immobile (_im) domains, with solute exchange between the domains characterized by the mass exchange coefficient (). In this study a sequential tracer application technique was used and K, , _im, and  were estimated for a series of pressure heads (H = 10, -30, -60, and -150 mm). This method uses a tension infiltrometer to measure both hydraulic and solute transport parameters in situ. The study took place in a no-till corn (Zea mays L.) field mapped as a Harps series soil (fine-loamy, mixed, mesic Typic Calciaquoll). Unsaturated values of  and K were distinct from the saturated values. Similarly, though less clear cut, distinctions between saturated and unsaturated values of _im, immobile water fraction (_im/), and were observed. The medians of  for the sequence of decreasing H values were 0.40, 0.34, 0.34, and 0.33 m³m^-3. The median K values for the same sequence of H's were 108, 1.69, 1.51, and 0.72 µms^-1. The median _im/ values for the H sequence were 0.40, 0.28, 0.25, and 0.39. The median values of  for the H sequence were 0.59, 0.015, 0.0028, and 0.0029 h^-1. A strong correlation between  and H suggests a velocity dependence of.

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