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Sensitivity analysis of the Pennsylvania phosphorus index for agricultural recycling of municipal biosolids.
- Article from:
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Journal of Soil and Water Conservation
- Article date:
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July 1, 2005
- Author:
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;
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Copyright informationCOPYRIGHT 2005 Soil & Water Conservation Society. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Forty-nine states are developing phosphorus (P) site indices to assess vulnerability of agricultural fields to P loss. When a P index has multiple variables and mathematical operations, it is often difficult to predict the sensitivity of the final site rating to individual input variables. Sensitivity analysis is a powerful diagnostic technique for assessing the behavior of a P index, prioritizing data collection and research efforts to improve its predictive capabilities, and for focusing management efforts. In this study, nominal range sensitivity analysis was used to determine the effect of input factor perturbations on the final P index score for agricultural biosolids recycling. ...
<5 tons/A
(SE)applicable
Irrigation Eroxion 1.5 Not Tailwater
(IE)applicablerecovery or
low QS
Runoff Class0.5 NegligibleVery low or
(RP) low
Phosphorus loss rating (Value)
SiteMedium High
Characteristics (2) (4)
SOURCE FACTORS
Soil Test P Medium High
(STP)
Fertilizer P Rate 31-90 90-150
(FR)lb [acre.sup.-1]lb [acre.sup.-1]
[P.sub.2][O.sub.5] [P.sub.2][O.sub.5]
Fertilizer IncorporatedDelayed
Application Method immediately incorporation
(FAM) before planting><3 mo.
before crop
Organic P Source31-60 lb/A 60-90 lb/A
Rate (OR) [P.sub.2][O.sub.5] [P.sub.2][O.sub.5]
Organic P SourceIncorporatedDelayed
Application Method immediately incorporation
(OAM) before planting><3 mo.
before crop
TRANSPORT FACTORS
Soil Erosion5-1010-15
(SE)tons/A tons/A
Irrigation Eroxion QS><8 Low
8 to 14 Medium
15 to 32 High><1 wk applied in
deep summer
Organic P source Refer to PSC table below
coefficient (PSC)
Transport factors
Soil erosion (SE)Soil loss (ton/A/yr)
Runoff potential (RP) 0 24
Very lowLow Medium
Sub-surface 01
draniage (SD) None Random
Contributing0 24
distance (CD)><150 ft.
Modified1.1
connectivity (MC) Direct connection
(when CD =><59 Low N-based mgmt
60 to 79Medium N-based mgmt
80 to 99High P-based mgmt>