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Management has more effect
on soil loss rather than other factor.
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Description of a management
is a list of dates, operations that occur on each date, and the vegetations
associated with an operation that has a “begin growth” effect and the residue
associated with an operation that has an “adds other cover” effect.
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Specific operations,
vegetations, and residues are selected from lists for those already in
databases.
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If required information is
not already in database, then a specific entry will have to be edited or a
new entry made.
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Access to database may be
limited and not available to particular users. Check with your supplier of RUSLE2.
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In general, accept values in
database because of the research and judgment gone into the preparation of
databases by researchers, NRCS technical specialists, and technical
specialists from other organizations.
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However, dates and
operations should be reflective of local conditions.
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Consistency among RUSLE2
applications is critically important.
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Be careful about trying to
modify variables like yield, depth, and speed to exactly the field
conditions. Changes in estimated soil loss may not be meaningful and
significant for small changes.
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Rotations are a cycle where
operations begin to repeat.
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A rotation can be one year.
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A rotation can include
multiple crops (vegetations).
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A management can include
volunteer vegetation (weeds) in addition to planted crops.
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RUSLE2 is dumb. Weeds must be in vegetation database and an
operation must be present to get the weeds to grow, and then an operation
must be present to stop weed growth.
The same applies to all vegetations.
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RUSLE2 only “sees” one
vegetation at a time. The information
in a vegetation file must reflect the overall conditions at the time.
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For example, RUSLE2 can
combine the information for small grain and a legume to know what is in the
field. The user must provide values
for the combined condition and specifically name and save that vegetation.
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NRCS and Extension Service
good source of information for cropland.
Consult other NRCS and other agencies like Bureau of Land Management
for range for other land uses.
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