Results and discussion
Intrinsic soil properties impact wind erosion within limits, but indirectly impact erosion by influencing temporal or external soil properties. We hypothesized that clay amendment would influence wind erosion within limits for a dry and loose soil surface. However, clay amendment may considerably affect crust crushing energy when generating natural physical crusts. After an erodible soil surface is created by tilling a crusted surface using a tillage simulator, erosion may be influenced by temporal wind erosion factors such as random roughness, aggregate GMD as well as aggregate crushing energy and density. A flow diagram of the wind tunnel study in evaluating the effect of progressive clay amendment on soil wind erosion in the inland Pacific Northwest is shown in Figure 3.