Table 2-22 (continued)
Ecoregion 63
no
Vegetated
. . . . . . . . . . .. . . .
( l o w e r basin)
filter strips
Ecoregion 65
(upper basin)
Phosphorus
Ecoreglon 63
(lower basin)
Phosphorus
Ecoregion 65
(upper basin)
Ecoregion 63
Phosphorus
no
Terraces
(lower basin)
Ecoregion 63
Phosphorus
These estimates do not include a safety factor.
ranges for animal waste management practices is primarily due to the variability in nutrient
RANGES: The spread the
the crops that receive animal waste application. Crops that require greater levels
manure
are also prone to lose
of the waste nutrients
to runoff and subsurface drainage. The less expensive end of the
range represents crops
high
rates of
Bermudagrass). The more expensive end of the range represents crops with lower agronomic rates of fertilization (e.g., small grains).
in N:P ratios in land-applied wastes. The
phosphorus cost-effectiveness range for animal waste practices is also driven by the
application rate for animal wastes is typically based only on the nitrogen content of the
The N:P ratio for different forms of swine and
ranges from
to
This variability is Incorporated into the calculations for the phosphorus cost-effectiveness range.
ranges for non-animal waste practices are driven by
range in conventional
loading factors for
are in ecoregions common to the Tar-Pamlico
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