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

Explore findings from Oregon State University's study on optimizing N applications for pasture forage production in Oregon, focusing on groundwater protection. Results include forage yield, protein content, and nitrogen uptake in Douglas and Benton Counties in 1999 and 2000. Discover the impact of N applications on early forage production and protein content, aiding livestock producers while safeguarding the environment.

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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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