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

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Presentation transcript:

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… for each treatment depended on harvest date (Significant treatment by clipping date interaction)

RESULTS 2/5 N4/2 N

Forage Yield (lb DM/ac) Douglas County /2/992/5/99

Protein(%) Douglas County /2/992/5/99

Nitrogen Uptake (Lb N/ac) Douglas County /2/99 2/5/99

Nitrogen Uptake (Lb N/ac) Douglas County (128%) 36 (60%) Lb N/ac

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

Forage Yield (Lb DM/ac) Douglas County /7/00 4/10/00

Protein (%) Douglas County /10/002/7/00

Nitrogen Uptake (Lb N/ac) Douglas County /10/00 2/7/00

Nitrogen Uptake (Lb N/ac) Douglas County (58%) 38 (64%) Lb N/ac

Soil Nitrogen

RESULTS Benton 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 PRODUCTION Benton County 1999 No N TRAD T-SUM + TRAD * Lb DM/ac Expt. II 5267

Protein Content (%) Benton County /10 & 3/28 3/28

Nitrogen Uptake (Lb N/ac) Benton County (117%) Lb N/ac *

FORAGE PRODUCTION Benton County 2000 a Lb DM/ac a 2/10 3/

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

Nitrogen Uptake (Lb N/ac) Benton County 2000 Lb N/ac a a /28 2/10

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