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Expert panel debates fertilizer-only limits versus A minus R performance metric
Summary
Panelists debated whether enforcing fertilizer-only application limits is useful or whether regulators should prioritize A minus R (applied minus removed) metrics that account for irrigation, compost, and crop removal; consensus favored A minus R where data exist but left room for regionally applied fertilizer signals where data are sparse.
Panelists for the State Water Resources Control Board's statewide agricultural expert panel spent much of the Dec. 12 meeting debating how regulators should measure and limit nitrogen application on irrigated lands.
Chair Daniel Geisler opened the discussion of Question 6 by asking whether some regions should use a fertilizer-only application limit as a blunt signal to growers or rely on the A minus R (applied nitrogen minus nitrogen removed by crops or other processes) metric that accounts for irrigation water and organic amendments. Several panel members said A minus R is the more direct…
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