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PROTECTING GROUNDWATER WHILE OPTIMIZING N APPLICATIONS FOR PASTURE FORAGE PRODUCTION IN OREGON

PROTECTING GROUNDWATER WHILE OPTIMIZING N APPLICATIONS FOR PASTURE FORAGE PRODUCTION IN OREGON. Shelby Filley and Gene Pirelli Oregon State University Extension Service. RESULTS Douglas County 1999 and 2000. Forage Yield Forage Protein Nitrogen Uptake…

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PROTECTING GROUNDWATER WHILE OPTIMIZING N APPLICATIONS FOR PASTURE FORAGE PRODUCTION IN OREGON

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  1. PROTECTING GROUNDWATER WHILE OPTIMIZING N APPLICATIONS FOR PASTURE FORAGE PRODUCTION IN OREGON Shelby Filleyand Gene Pirelli Oregon State University Extension Service

  2. RESULTSDouglas County 1999 and 2000 • Forage Yield • Forage Protein • Nitrogen Uptake… for each treatment depended on harvest date (Significant treatment by clipping date interaction)

  3. RESULTS 2/5 N 4/2 N

  4. Forage Yield (lb DM/ac) Douglas County 1999 4/2/99 2/5/99

  5. Protein(%) Douglas County 1999 4/2/99 2/5/99

  6. Nitrogen Uptake (Lb N/ac)Douglas County 1999 4/2/99 2/5/99

  7. Nitrogen Uptake (Lb N/ac)Douglas County 1999 77 (128%) 36 (60%) Lb N/ac

  8. Forage Yield (Lb DM/ac) Douglas County 2000 b c a a LB/ACRE a

  9. Forage Yield (Lb DM/ac)Douglas County 2000 4/10/00 2/7/00

  10. Protein (%)Douglas County 2000 4/10/00 2/7/00

  11. Nitrogen Uptake (Lb N/ac)Douglas County 2000 4/10/00 2/7/00

  12. Nitrogen Uptake (Lb N/ac)Douglas County 2000 35 (58%) 38 (64%) Lb N/ac

  13. Soil Nitrogen

  14. RESULTSBenton County 1999 and 2000 • FORAGE YIELD • PROTEIN CONCENTRATION • NITROGEN UPTAKE • In 1999 (one harvest) differed depending on treatment • In 2000 (two harvests) differed for each treatment depending on harvest date

  15. FORAGE PRODUCTIONBenton County 1999 * 5267 T-SUM + TRAD Lb DM/ac 2553 2156 No N TRAD Expt. II

  16. Protein Content (%)Benton County 1999 2/10 & 3/28 3/28

  17. Nitrogen Uptake (Lb N/ac)Benton County 1999 * 70 (117%) Lb N/ac

  18. FORAGE PRODUCTIONBenton County 2000 a a Lb DM/ac 3/28 2/10 20 16

  19. Protein Content (%)Benton County 2000 2/10 & 3/28 2/10

  20. Nitrogen Uptake (Lb N/ac)Benton County 2000 a a 3/28 Lb N/ac 2/10 20 16

  21. Summary • Application of N at T-Sum 200 generally increased early forage production and protein content. • On N fertilized plots the amount of N recovered in excess of controls was between 60 and 70% of the N applied at T-Sum 200.

  22. Summary • Application of N at T-Sum 200 should be used on sites where N is clearly limiting. • Early growth will be produced, utilizing the N that is supplied, and livestock producers will benefit from the early season forage without detrimental effects to the environment.

  23. Summary • Mylen Bohle - Deschutes County • Jay Carr - Baker County • Troy Downing - Tillamook County • Shelby Filley - Douglas County • John Hart - OSU Extension Soil Specialist • Gene Pirelli - Benton County • Marni Porath - Lake County • Amy Ruddell - Coos/Curry County

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