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APLE

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The Annual P Loss Estimator (APLE) is a Microsoft Excel spreadsheet model that runs on an annual time step and simulates sediment bound and dissolved P loss in surface runoff and annual changes in soil test P. This empirically based model was designed for use by those without significant modeling experience and relies on a handful of commonly measured input variables. APLE considers different kinds of animal manure (beef, dairy, poultry, swine), applied either by machine or by grazing beef or dairy cattle, and highly soluble commercial fertilizers. 

The APLE model was developed by Peter A. Vadas (peter.vadas@usda.gov) in 2009 and updated (ver 3.0) by Carl H. Bolster (carl.bolster@usda.gov) in 2022.    

For Theoretical Documentation and User Manual please visit the APLE homepage 

 

 

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