Discussion
The soil erodibility factor needs to be determined for use in the universal soil loss equation. The length, in m and slope, in % of the experimental plot to be used for this purpose, respectively are
Answer: C
The plot is 22 m long on a 9% slope.
In the universal soil loss equation the erodibility factor K is defined as the soil loss per unit of rainfall erosion index measured on the standard unit plot: 72.6 ft (22.1 m) long on a uniform 9% slope, kept in continuous clean-tilled fallow with tillage up and down the slope. The slope length and steepness factors L and S equal 1 for exactly this plot, which is why the other dimensions are adjusted relative to it.
The other length and slope pairs (19 m and 12%, 21 m and 11%, 23 m and 8%) are not the standard plot, so a K measured on them would have to be corrected through L and S before use.
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