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Nutrient Budgets For CNMPs

Nutrient Budgets For CNMPs. Nutrient Management Planners Training March 31, 2009 Bobby Smith County Extension Coordinator UGA Cooperative Extension Morgan County. Animal manures used for centuries as fertilizer. Benefits: micronutrients slow release of N an P  SOM

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Nutrient Budgets For CNMPs

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  1. Nutrient Budgets For CNMPs Nutrient Management Planners Training March 31, 2009 Bobby Smith County Extension Coordinator UGA Cooperative Extension Morgan County

  2. Animal manures used for centuries as fertilizer Benefits: micronutrients slow release of N an P  SOM  soil structure  CEC carbon sink (global warming)

  3. Nutrients in organic form N P K is not in same proportion that crops need – usually 1-2-2 instead of 3-2-1.

  4. Balancing Manure nutrient inputs Crop needs

  5. Nutrient Budgets • N-based budgets • Minimize NO3 leaching • Manures supply more P than crops need • Excess P leads to eutrophication • Will have P-based budgets • Determine priority nutrient

  6. Nutrient Budgets • Two methods • Spreadsheets – QuattroPro & Excel • Ag Pollution Prevention page • http//www.agp2.org • Nutrient Management Planning in Georgia • CNMP Tools • Worksheet • In notebook

  7. Nutrient Budgets Both methods are Field Scale • Calculate budgets for each field and sum for farm • Proper rate for each field • Simulate different scenarios

  8. Three Steps • Determine crop needs • Determine nutrients supplied • Balance

  9. Crop Needs • Need crops to use nutrients • Crops have to fit in production system • Crops needs vary • Table in Notebook • Crop recommendations • Based on SOIL TEST • Maintain nutrient balance • Maintain pH

  10. Nutrients Available from Manure • Nutrients in organic form • Not all available to plants • Nitrogen • Mineralization • Waste characteristics, temperature, moisture • Losses to volatilization • pH, temperature, how applied

  11. Nutrients Available from Manure • Definitions Total N = Organic N + NO3 + NH4 Plant available N % Organic N + NO3 + NH4 TKN (Total Kjeldalh N) Organic N + NH4

  12. Example – Fresh Dairy Manure (wet basis) TKN = 10.4 lbs/ton NH4 = 1.9 lbs/ton NO3 = 0.03 lbs/ton What is Total N? TKN + NO3 = 10.4 lbs/ton What is PAN? (%mineralized*(TKN-NH4)) + NH4 + NO3 = 2.6 + 1.9 +0.03 = 4.53 lbs/ton

  13. Nutrients Available • UGA manure test results give total nutrients • Determine Plant Available Nutrients • Use Availability Coefficients • Depends on manure and application method • Incorporates losses through volatilization and form of nutrient

  14. Nutrients Available • UGA lab reports on wet basis • Dry basis need % solids • To use spreadsheet need results • Wet basis • Total N, P2O5, K2O

  15. Balancing Needs Go to Spreadsheet

  16. Summary • Manure • Improves Soil Organic Matter • Improves Soil Structure • Increases Cation Exchange Capacity • Provides Micronutrients • Not all nutrients are available to plants Manure is not in the correct ratio for crop use (usually 1-2-2 instead of 3-2-1)

  17. Summary Continued • Nutrient Budgeting is balancing manure nutrients supplied with crop needs • Nutrient Budgets are field scale • Availability coefficients according to manure application and storage method determine percent available

  18. AGRICULTURAL POLLUTION PREVENTION PROGRAM Sponsored by the GA Pollution Prevention Assistance Division-AgP2 Bobby Smith- rcsmith@uga.edu UGA Cooperative Extension Biological & Agricultural Engineering Dept. College of Agricultural & Environmental Sciences University of Georgia

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