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Nutrient Management Planning

Nutrient Management Planning. Will these be mandated in your state? An emerging national issue is how to account for agricultural non-point source pollution. If your state has passed legislation concerning Total Maximum Daily Loads (TMDLs) you should plan for NMP mandates?.

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Nutrient Management Planning

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  1. Nutrient Management Planning • Will these be mandated in your state? • An emerging national issue is how to account for agricultural non-point source pollution. • If your state has passed legislation concerning Total Maximum Daily Loads (TMDLs) you should plan for NMP mandates?

  2. Clear Understanding? • According to the EPA’s State Source Water Assessment and Protection Program Final Guidance (U.S. EPA’s SSWAPP Final Guidance, August 1997, page A-25) a susceptibility analysis should be conducted with, “clear understanding where the significant potential sources of contamination are located.”

  3. Application of CNMPs • Such plans, if applied on a wide-scale basis, would account for agricultural non-point source pollution, however few agencies have the ability to access this large-scale data. • GIS would be a good candidate to accomplish this task.

  4. General NRCS Requirements • Aerial photos (base map). • Soil Maps, Soil Test Results. • Planned Crop Sequence. • Manure Sample Analysis. • Realistic Yield Goals. • Recommended nutrient rates and timing. • Location of sensitive areas. • Complete nutrient budget for N,P,K. • Phosphorus Index Rating.

  5. CNMPs are more than pollution tracking. What are the benefits of a CMNP? • Resource management. • Prevent runoff, soil loss. • Land Stewardship (Clean water) • Sustainable Production • Efficiency • Reduce Input Cost. • Improves Management Structure. • Facilitates Better Planning.

  6. What are the problems with such a plan. • No structure currently exists to manage site-specific data on a large scale. • More Programs! • Restrictions on farming practices. • Cost of implementation.

  7. Can the EPA and USDA fulfill their commitment? • The Total Maximum Daily Loads (TMDLs) for streams and lakes are set by the state and cannot be exceeded. • Currently the mechanism for locating non-point source pollution is a watershed scale analysis. • Such an analysis does not adequately account for agriculture’s contribution to waterway pollution.

  8. Site-Specific Data. • It is imperative that site-specific data be promoted as the needed data for these plans. • Though some extrapolation of data is warranted, there are some attributes such as yield and nutrient levels that are unique to a field. • Averages of such data by county, will not adequately represent a field and may result in misapplication of both organic and inorganic fertilizers.

  9. Following is just one element that may improve the resolution of CNMPs. • Site-specific field erosion. • Currently it is acceptable to calculate field erosion using the slope values from SSURGO data. • There is the possibility for large errors when using this data.

  10. Soil Loss • Revised Universal Soil Loss Equation (RUSLE) • 30 meter resolution Digital Elevation Model data will be used to establish slope steepness for each field. • Acquisition: Online download from USGS data warehouse. • R – Rainfall Erosion Index. • NRCS averages for the area. • K – SSURGO Data (Soil Types) • Acquisition: From NASIS Soil Data Viewer (NASIS). • C and P (Site specific data ) • Cover Management Factors. • Support Practice Factors. • Slope length. • Terracing and /or contouring.

  11. Study SITE • Approximately 5 miles north of Enid, Oklahoma. • Well drained silt loam. • Irrigated corn, soybean rotation. • Conventional tillage.

  12. Slope Steepness • It is important to note that both methods are an improvement over SSURGO data. • This research found no significant difference between the average slope calculated using a inclinometer and the average slope generated using 30 by 30 meter DEM data.

  13. Slope Surface (DEM) • Though, only a small area of this field contains 4–5 % slopes. SSURGO data attributes this entire field with a 1–3% percent slope. • Surface values were verified using a inclinometer.

  14. Slope Lengths Must be Site-Specific! • There are many papers suggesting that slope length can be obtained from DEMs. • This research found that though DEMs accurately depict average slope, this is not the case with slope length.

  15. Highly Erodible Land (HEL)

  16. Spreadable acres • Considering P2O5 levels and HEL there are only 32.87 spreadable acres. • Currently these restrictions only apply to manure.

  17. Erosion is only one element of a CNMP. • Feel free to ask question concerning any aspect of CNMP’s.

  18. R&D Cooperation • Manure Management Planner • Developed by Brad Joern and Phil Hess of Purdue University. • Outstanding tool for barn management. • John Lory of the University of Missouri-Columbia is developing a MMP ArcView extension.

  19. Manure Manager

  20. National Soil Information System(NASIS)

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