User capabilities and next generation phosphorus (P) indices

Purpose

The phosphorus (P) index is the primary approach to identify field management strategies and/or manure application strategies likely to lead to excessive risk of P loss. It has been over 40 years since the first research connecting agronomic P management and water quality and over 20 years since the initial publication defining a P Index.…

Estimation of phosphorus loss from agricultural land in the Heartland region using the APEX model: a first step to evaluating phosphorus indices

Purpose

Phosphorus (P) indices are a key tool to minimize P loss from agricultural fields but there is insufficient water quality data to fully test them. Our goal is to use the Agricultural Policy/Environmental eXtender Model (APEX), calibrated with existing edge-of-field runoff data, to refine P indices and demonstrate their utility as a field assessment tool capable of protecting water quality.…

Wisconsin Producer Perspective on the Phosphorus Index

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Why Evaluate the P-Index from the Farmer’s Perspective?

The phosphorus index is a risk management tool, designed to evaluate the potential for runoff from a field based on the conditions and management of that field. Based on many years of work with farms in Wisconsin, the author sees the P-Index as valuable tool for comparing fields and management on the same farm and influencing choices that will lead to the lowest risk of runoff.…

What’s the P Index?

The P Index is the Phosphorus Index, a risk assessment tool to quantify the potential for phosphorus runoff from a field. The P Index helps to target critical source areas of potential P loss for greater management attention. It includes source and transport factors. Source factors address how much P is available (for example, soil test P level and P fertilizer and manure application amounts).…