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USDA/ARS National Soil Tilth Laboratory 2004

USDA/ARS National Soil Tilth Laboratory 2004. Gulf Hypoxia Goals. Reduce average to 5000 km 2 by 2015 2001 Hypoxia Action Plan - 30% N reduction target Updated Gulf Science – 35-45%, up to 55% & 60% N reduction, P reduction SAB report 8/27/07 – at least 45% reductions of both N and P.

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USDA/ARS National Soil Tilth Laboratory 2004

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  1. USDA/ARS National Soil Tilth Laboratory 2004

  2. Gulf Hypoxia Goals Reduce average to 5000 km2 by 2015 • 2001 Hypoxia Action Plan - 30% N reduction target • Updated Gulf Science – 35-45%, up to 55% & 60% N reduction, P reduction • SAB report 8/27/07 – at least 45% reductions of both N and P

  3. 2001-2005 Nitrogen Loadings to the Gulf • 32% N reduction – “previous” regression method for USGS monitoring data • 21% N loading reduction – “new” regression method for USGS monitoring data • No corresponding change in size of zone

  4. Role of fertility management to reduce N transport to water resources and to meet Gulf hypoxia N reduction targets? Impact of annually increasing corn yields with steady fertilizer rates? Excess nutrients?

  5. Iowa’s Statewide Nutrient Budget

  6. Iowa Statewide Hypoxia Strategy Dean’s 10/15/07 Strawman N Reduction Target 45%, at least Improved fertility mgmt 10% Riparian buffers <1% Drainage management ?? Not discovered practices ?? Row crop land retirement ?? N sink wetlands 30+%

  7. Needed “Scaling” of N Sink WetlandDeployment • Current Iowa CREP – 20 sites/year • Adoption level to achieve 40-50% reduction of statewide NO3 transport to water resources for Gulf hypoxia goal 3,000 – 10,000 N sink wetland sites in Iowa

  8. 478 sites 10,000 sites

  9. 1993 – 2007 IDALS Funding of N-sink wetland research, ISU SFY2002 $3,000,000 appropriation CREP Signing Ceremony at Iowa State Fair Individual 404 permits required & initiate programmatic agreements for RP CREP discussion initiated with FSA SFY2001 $3,000,000 appropriation CREP Engineering outsourced NRCS designs first 6 sites under NWP 27 First sites approved through Regional Permit #34 1999 2000 2001 2002 2003 2004 2005 2006 2007 2000 Iowa legislature pass water initiative – includes CREP SFY2001 ($2,990,583) de-appropriation SFY2002 ($2,965,465) de-appropriation Dedicated CREP Field/ Landowner Contact Support Regional Permit #34 issued 20 CREP wetland projects constructed to date – 6 under NWP 27, 14 under individual 404 permits

  10. Regulatory Economics Deappropriation ? CREP Progress 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007

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