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Panel weighs regional discount factors for organic amendments and modeling approaches

State Water Resources Control Board expert panel (second statewide agricultural expert panel) · December 15, 2025

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Summary

Panelists compared Region 3's empirically derived discount-factor approach for compost/organic fertilizers with Region 5's CV SWAT model-based method, stressing regional sensitivity of mineralization rates and calling for more targeted research and QA for reporting.

Panelists turned to Question 7 to evaluate whether discount factors (credits) for organic amendments and additional components of R (Rscavenge, Rtree, Rother) produce valid, comparable A over R and A minus R values across growers and regions.

Hannah Waterhouse summarized the technical definitions and constraints of discount factors (cover crop biomass thresholds, specific timing and biomass criteria for an…

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