Annual Phosphorus Loss Estimator
Annual Phosphorus Loss Estimator (APLE) is an online tool developed by the USDA Agricultural Research Service (ARS). It consists of a Microsoft Excel spreadsheet model that simulates sediment bound and dissolved P loss in surface runoff. It is intended to simulate edge-of-field P loss for uniform fields of several hectares in size, or smaller. 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.
Developer: USDA Agricultural Research Service
Time Investment: Moderate – High