By Edgar L Michalson; Robert I Papendick; John E Carlson; Solutions to Environmental & Economic Problems (Organization)
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Extra info for Conservation farming in the United States : the methods of accomplishments of the STEEP program
The relationship is assumed to be linear. 0 when there is 100% canopy cover. The benefit is reduced for taller plants and trees that intercept raindrops that then drip to the soil from some height. Random distribution of canopy is assumed in the relationship. Preliminary data from recent studies at the PCFS and on producer’s fields indicate that when the canopy is not random but is in rows at the bottom of a furrow, a given mean percent cover has much more effect than previously assumed. In fact, on plots with up-and-down slope 10-in.
The control treatment was a continuous-tilled bare fallow. Data were analyzed and treatments compared and reported in technical bulletins specific to each station. , 1944). There was no developed erosion prediction technology through which the data could be extended to apply to conditions at other locations. Later, the data were assembled and normalized so that data from all stations could be interpreted and results generalized. Topographic effects were considered in some projects. 1) x = total soil loss, weight units s = land slope, % λ = slope length, ft.
Soil depth and soil properties differ from one part of the landscape to another even in unfarmed areas because the thickness of the youngest loess layer varies across hill slopes and across the region, as does the character of older loess beneath the youngest loess. In places where the young loess was naturally very thin, such as on hilltops and convex midslope knobs, or where accelerated erosion has been severe (or both), the topsoil and cambic horizons are thin or absent and older subsoil materials are near or at the surface.