2012
DOI: 10.2134/jeq2012.0001
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Abstract: The Wisconsin Phosphorus Index (WPI) is one of several P indices in the United States that use equations to describe actual P loss processes. Although for nutrient management planning the WPI is reported as a dimensionless whole number, it is calculated as average annual dissolved P (DP) and particulate P (PP) mass delivered per unit area. The WPI calculations use soil P concentration, applied manure and fertilizer P, and estimates of average annual erosion and average annual runoff. We compared WPI estimated … Show more

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Cited by 38 publications
(44 citation statements)
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“…In a truly predictive mode, runoff and erosion are determined with models such as the SCS Curve Number and RUSLE2, respectively. These predictions will be less accurate and more uncertain than direct measurements of these variables (Eghball and Gilley, 2001; Good et al, 2012; Haan et al, 1995; Harmel et al, 2005; Hession et al, 1996). As a result, uncertainties in APLE predictions will be much larger than estimated in our study for modeling applications that use estimated runoff and erosion as inputs.…”
Section: Resultsmentioning
confidence: 99%
“…In a truly predictive mode, runoff and erosion are determined with models such as the SCS Curve Number and RUSLE2, respectively. These predictions will be less accurate and more uncertain than direct measurements of these variables (Eghball and Gilley, 2001; Good et al, 2012; Haan et al, 1995; Harmel et al, 2005; Hession et al, 1996). As a result, uncertainties in APLE predictions will be much larger than estimated in our study for modeling applications that use estimated runoff and erosion as inputs.…”
Section: Resultsmentioning
confidence: 99%
“…After testing, we used SurPhos to estimate dissolved P loss in runoff from manure that was surface applied at different times of the year. We collected measured precipitation and runoff data from seven field‐scale sites in Wisconsin, as described by Jokela and Casler (2011) and Good et al (2012). Data included 108 site–years, with a site–year from 1 October to 31 September.…”
Section: Methodsmentioning
confidence: 99%
“…The processes described above for P loss in runoff from soil, manure, and fertilizer have been well tested (Vadas et al, 2009;Good et al, 2012). For this project, we adapted and tested APLE so it would simulate P loss in runoff from dung applied by grazing cattle.…”
Section: Aple Testing For Pasturesmentioning
confidence: 99%
“…The first group is highly parameterized, daily time-step, process-based models like the farm-scale Integrated Farm Systems Model (IFSM) (Sedorovich et al, 2007), or field to watershed-scale models like the Soil and Water Assessment Tool (SWAT) (Arnold et al, 1998) or the Agricultural Policy/Environmental eXtender (APEX) (Gassman et al, 2010). The second group is more user-friendly, seasonal to annual time-step models, such as the Annual P Loss Estimator (APLE) (Vadas et al, 2009 and the Wisconsin P Index (WI PI) (Good et al, 2012), that are a combination of process-based and empirical P loss equations. However, all of these tools have shortcomings when simulating P loss via surface runoff from cattle-grazed pastures.…”
Section: Introductionmentioning
confidence: 99%