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The unit plot provides a
standard and reference condition to define and determine values for soil
erodibility factor.
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The unit plot condition is a
reference condition for all of the other RUSLE2 factors. A value for another RUSLE2 factor besides r
or k is the ratio of soil loss for the given condition to the soil loss from
the reference condition of the unit plot.
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The starting in RUSLE2 is
the product of rk, which gives a soil loss value for the reference unit plot
condition. The other factors adjust
for the difference between field conditions and the reference unit plot condition.
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Tons/Acre/Year from a specific slope (L)
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Unit Plot = 72.6’ and 9%
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R is computed from weather
records
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K is a measure of
erodibility for a CONTINUOUS
CULTIVATED
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FALLOW condition.
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L (72.6’) = 1
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S (9%) = 1
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C ( CONTINUOUS CULTIVATED FALLOW) = 1
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P (UP & DOWN) = 1
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RUSLE estimates erosion when
there are adjustments to the unit plot.
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