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SHADOWS ANALYSIS TO MEASURE SOIL SURFACE ROUGHNESS TO EVALUATE WIND EROSION $100.00
Authors:  R. García Moreno, M.C. Díaz Álvarez, A.M. Tarquis and A. Saa Requejo
Abstract:
Wind erosion can be evaluated from quantitative descriptions of soil surface
roughness (SSR). Soil surface roughness describes the micro variation in the surface
elevation across a field resulting mainly from tillage practices and soil texture. The study
presented in this chapter, therefore aimed to fill the need for a reliable, low-cost, easy to
carry and convenient method to measure that parameter. Based on the interpretation of
micro-topographic shadows, this new procedure is primarily designed to use in the field
The method has been named shadows analysis since the principle underlying the
technique is the direct relationship between soil surface roughness and the shadows cast
by soil structures under fixed sunlight conditions. The results obtained with this method
were compared to the statistical indexes used to interpret field readings recorded by a pin
meter. Three types of tillage tools (roller, chisel and tiller) were used to work two
different soils (sandy clay loam and sandy loam), to obtain different SSR scenarios.
The highly significant correlation between the statistical indexes and shadow
analysis results obtained in the laboratory as well as in the field for all the soil-tool
combinations proved that both variability (CV) and dispersion (SD) are accommodated
by the new method. Also Multi Fractal Analyses were applied to the results of both
methods to evaluate the influence on the resulting soil structure. This procedure
simplifies the interpretation of soil surface roughness and shortens the time involved in
field operations by a factor ranging from 12 to 20. 


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SHADOWS ANALYSIS TO MEASURE SOIL SURFACE ROUGHNESS TO EVALUATE WIND EROSION