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Iowa P-Index Relationship to Feedlots

Why!!!. 300 head finishing Cattle open lot4 ton / head /year1200 tons / year producedManure analysisTotal N 14

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Iowa P-Index Relationship to Feedlots

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    1. Iowa P-Index Relationship to Feedlots Steve Brinkman CCA Nutrient Management Specialist USDA / NRCS steven.brinkman@ia.usda.gov 515-323-2243

    2. Why!!! 300 head finishing Cattle open lot 4 ton / head /year 1200 tons / year produced Manure analysis Total N 14 # / ton P2O5 -- 11 # / ton 16800# Nitrogen- 13200# P2O5

    3. Why!!! 35% N availability 30% application loss 100% P availability 156 bu corn 44 bu beans 125# N 36.4 ton Nitrogen Rate =33 acres + 33 acres = 66 acres 8.5 ton P- removal rate = 141.2 acres + 141.2 acres = 282.4 acres

    4. Purpose of the P-Index Assess the Risk of Phosphorous delivery to surface waters Tool to be used by Conservation Planners, Landowners and Land Users Used to Help Make Management Decisions in Developing ways to Reduce Risks

    5. Iowa Phosphorus Index Tool to assess potential for P loss from field to surface water More comprehensive than soil test Integrates many soil and field characteristics Integrates many management and conservation practices P-Index looks at source and transport factors

    6. When is the P-Index Required NPDES NMPs > 1000 animal units found to have discharged and need a permit or declared a CAFO DNR MMP Confinement feeding operations over 500 animal units

    7. When is the P-Index Required EQIP funds are used for waste water and manure handling needs NRCS -- CNMP NRCS NMPs if

    8. P-Index Use Required -- NRCS Animal Manure or Organic By-Products applied ID as designated P related impairment (DNR 303D List) http://www.iowadnr.com/water/tmdlwqa/wqa/303d.html Current Soil Test P is very high Soil Losses exceed T

    9. Phosphorus Index Characteristics Source Factors soil test P, (STP) total P, rate, methods, and timing of P applications (including manure), erosion

    10. Phosphorus Index Characteristics Transport Factors sediment delivery, relative field location in watershed, soil conservation practices, precipitation, runoff, tile flow/subsurface drainage

    11. P-Index -Three Components

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