North Carolina State University. USDA, Agricultural Research Service Univ. MD Center for Environ. Science. Delaware Dep.

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1 Phase 6 Nutrient Management Expert Panel Name Frank Coale, chair Deanna Osmond Doug Beegle Jack Meisinger Tom Fisher Quirine Ketterings Affiliation University of Maryland North Carolina State University Penn State University USDA, Agricultural Research Service Univ. MD Center for Environ. Science Cornell University Watershed Technical Workgroup Chris Brosch CBP Modeling Team Matt Johnston Agriculture Workgroup Coordinator Mark Dubin Delaware Dep. of Agriculture University of Maryland, CBPO University of Maryland, CBPO

2 Phase 6 Nutrient Management Expert Panel Guiding Principles 1. Nitrogen (N) and phosphorus (P) assessments are handled similarly but separately. 2. Historical base-line conditions (i.e.1985) are used as a uniform reference point for pre-bmp, non-nutrient management conditions. 3. Core Nutrient Management BMP efficiency factors for N and P are based on state LGU recommendations, as modified by CBP state partners, and represent land-use and cropping system specific N and P application rates. 4. Core Nutrient Management BMP efficiency factors for N and P modify the nutrient application rate goals. 5. Nutrient Management BMP efficiencies for rate, timing and placement of N and P are additive to the Core Nutrient Management BMP efficiencies for N and P, but can not be applied without application of the Core BMPs. 6. Nutrient Management BMP efficiency factors modify the edge of field nutrient loss to the receiving stream. 7. All BMP efficiency values for N and P are numeric variables that have been define by the Nutrient Management Expert Panel. 8. County-level redistribution of CBW N fertilizer sales data should be used as an independent crossreference for and validation of the modified LGU recommendation based N application rate goals. 9. LGU recommendations for P application are based on soil-test P concentration. Soil P concentration data are not available to CBP but should be collected and utilized in the future. In the absence soil-test P based application rate goals, county-level redistribution of CBW P fertilizer sales data may serve as a surrogate.

3 Nitrogen Nutrient Management Factors NITROGEN Core Nutrient Management BMP (ALL core elements required to be implemented and verified) N application goal (N rate) according to LGU recommendations at field level analysis and volume - test value or book value Spreader/applicator calibration Yield estimates and cropping plan at field level Cropping and manure history at field level NO No credit for N Core Nutrient Management BMP Credit for N Core Nutrient Management BMP efficiency N application goal = LGU recommendation x A N application goal = LGU recommendation x B NITROGEN Nutrient Management BMPs If Core Nutrient Management BMP efficiency is applied, follow with advanced assessment for Nutrient Management BMPs Advanced N Assessment PSNT analysis < 3 years old On-farm replicated research CSNT N-loss risk assessments & models - Ammonia loss Yield mapping ISNT On-farm strip trials N-loss risk assessments & models - Leaching loss FSNT N-loss risk assessments & models - Denitrification losses Whole farm balances In-season sensors/remote sensing in general Geo-spatial mapping N Rate Adjustment N rate less than LGU recommendations Split N applications Variable rate N application N Placement Adjustment Subsurface injection or incorporation of applied N N application setbacks from water N Timing Adjustment Split N applications N Rate = EOF load x C N Placement = EOF load x D N Timing = EOF load x E

4 Phosphorus Nutrient Management Factors PHOSPHORUS Core Nutrient Management BMP (ALL core elements required to be implemented and verified) P application goal (P rate) according to LGU recommendations at field level P soil tests at field level NO No credit For P Core Nutrient Management BMP P application goal = LGU recommendation x F analysis and volume - test value or book value Spreader/applicator calibration Yield estimates and cropping plan at field level Cropping and manure history at field level Credit for P Core Nutrient Management BMP efficiency P application goal = LGU recommendation x G PHOSPHORUS Nutrient Management BMPs If Core Nutrient Management BMP efficiency is applied, follow with advanced assessment for Nutrient Management BMPs Advanced P Assessment Soil test P remediation/declining Soil tests < 3 years old P Index assessment Grid soil sampling analysis < 3 years old On-farm replicated research Yield mapping On-farm strip trials Whole farm balances Geo-spatial mapping P Rate Adjustment P-based manure rate based on annual crop removal P rate less than LGU recommendations Variable rate P Split P applications P Placement Adjustment Subsurface injection or incorporation of applied P P application setbacks from water P Timing Adjustment P application in lower P-loss risk season P Rate = EOF load x H P Placement = EOF load x I P Timing = EOF load x J

5 Nutrient Management Values draft version #4, Nutrient Management BMP Nitrogen Core Non-Nutrient Management BMP efficiency Nitrogen Core Nutrient Management BMP efficiency Nitrogen Rate BMP efficiency Nitrogen Placement BMP efficiency Nitrogen Timing BMP efficiency BMP Efficiency Variable Action of BMP modifies N application rate goal A on the nutrient input side modifies N application rate goal B on the nutrient input side modifies edge of field N loss to C the stream on the outflow side modifies edge of field N loss to D the stream on the outflow side modifies edge of field N loss to E the stream on the outflow side How the math works LGU N application rate goal LGU N application rate goal calculated edge of field N load calculated edge of field N load calculated edge of field N load Phosphorus Core Non-Nutrient Management BMP efficiency Phosphorus Core Nutrient Management BMP efficiency Phosphorus Rate BMP efficiency Phosphorus Placement BMP efficiency Phosphorus Timing BMP efficiency F G H I J modifies P application rate goal on the nutrient input side modifies P application rate goal on the nutrient input side modifies edge of field P loss to the stream on the outflow side modifies edge of field P loss to the stream on the outflow side modifies edge of field P loss to the stream on the outflow side LGU P application rate goal LGU P application rate goal calculated edge of field P load calculated edge of field P load calculated edge of field P load

6 Nutrient Management Values draft version #4, BMP Efficiency Variable Full Season Soybeans Grain w/ Grain w/o Legume Hay Silage w/ Silage w/o Small Grains and Grains Small Grains and Soybeans Specialt y Crop High Specialty Crop Low Other Agronomic Crops Nutrient Management BMP Nitrogen Core Non-Nutrient Management BMP efficiency A Nitrogen Core Nutrient Management BMP efficiency B Nitrogen Rate BMP efficiency C Nitrogen Placement BMP efficiency D Nitrogen Timing BMP efficiency E Other Hay Pasture Phosphorus Core Non-Nutrient Management BMP efficiency F Phosphorus Core Nutrient Management BMP efficiency G Phosphorus Rate BMP efficiency H Phosphorus Placement BMP efficiency I Phosphorus Timing BMP efficiency J

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