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Panel urges A minus R as primary metric; recommends targeted research on discount factors and fertilizer-only tables
Summary
Panelists favored A minus R (applied minus removed) as the primary metric for assessing nitrogen risk but discussed complementary fertilizer-focused tables and region-specific discount factors for organic amendments; they recommended targeted research and improved region-level data to refine those approaches.
Panel members debated whether to rely on a fertilizer-only application limit or to retain A minus R (applied minus removed) as the principal metric for estimating nitrate risk to groundwater. Daniel Geisler framed Question 6 by asking whether the panel should recommend a two-step approach (application limits plus A minus R) or focus only on fertilizer application.
Several technical experts — including Hannah Waterhouse and Richard Smith — said A minus R better captures the full set of nitrogen inputs (fertilizers, irrigation water nitrogen, and organic amendments) and helps…
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