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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 Shelby Filleyand Gene Pirelli Oregon State University Extension Service
RESULTSDouglas County 1999 and 2000 • Forage Yield • Forage Protein • Nitrogen Uptake… for each treatment depended on harvest date (Significant treatment by clipping date interaction)
RESULTS 2/5 N 4/2 N
Forage Yield (lb DM/ac) Douglas County 1999 4/2/99 2/5/99
Protein(%) Douglas County 1999 4/2/99 2/5/99
Nitrogen Uptake (Lb N/ac)Douglas County 1999 4/2/99 2/5/99
Nitrogen Uptake (Lb N/ac)Douglas County 1999 77 (128%) 36 (60%) Lb N/ac
Forage Yield (Lb DM/ac) Douglas County 2000 b c a a LB/ACRE a
Forage Yield (Lb DM/ac)Douglas County 2000 4/10/00 2/7/00
Protein (%)Douglas County 2000 4/10/00 2/7/00
Nitrogen Uptake (Lb N/ac)Douglas County 2000 4/10/00 2/7/00
Nitrogen Uptake (Lb N/ac)Douglas County 2000 35 (58%) 38 (64%) Lb N/ac
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
FORAGE PRODUCTIONBenton County 1999 * 5267 T-SUM + TRAD Lb DM/ac 2553 2156 No N TRAD Expt. II
Protein Content (%)Benton County 1999 2/10 & 3/28 3/28
Nitrogen Uptake (Lb N/ac)Benton County 1999 * 70 (117%) Lb N/ac
FORAGE PRODUCTIONBenton County 2000 a a Lb DM/ac 3/28 2/10 20 16
Protein Content (%)Benton County 2000 2/10 & 3/28 2/10
Nitrogen Uptake (Lb N/ac)Benton County 2000 a a 3/28 Lb N/ac 2/10 20 16
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.
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.
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