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| Titel |
Shadow analysis: a method for measuring soil surface roughness |
| VerfasserIn |
R. García Moreno, A. Paz González, M. C. Díaz Alvarez, Antonio Saa Requejo, A. M. Tarquis |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250021413
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| Zusammenfassung |
| Erosion potential and the effects of tillage can be evaluated from quantitative descriptions
of soil surface roughness. The present study therefore aimed to fill the need for a
reliable, low-cost and convenient method to measure that parameter. Based on the
interpretation of micro-topographic shadows, this new procedure is primarily designed for
use in the field after tillage. The principle underlying shadow analysis 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. The
tests were conducted on 4-m2 sandy loam and sandy clay loam plots divided into
1-m2 subplots tilled with three different tools: chisel, tiller and roller. 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. 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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