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United States Department of Agriculture

Agricultural Research Service

Title: NITROGEN LEACHING FROM DAIRY PASTURES IN THE NORTHEAST UNITED STATES)

Author
item Stout, William
item Elwinger, Gerald
item Fales, Steve
item Muller, Larry
item Schnabel, Ronald
item Priddy, William

Submitted to: Grassland International Congress Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 3/25/1997
Publication Date: N/A
Citation:

Interpretive Summary: Not required.

Technical Abstract: While intensive grazing has the potential to increase dairy farm profitability in the Northeast United States, the uneven distribution of N through feces and urine can increase NO3- leaching. We measured NO3- leaching loss from urine and feces beneath N-fertilized orchardgrass using 60 cm diameter by 90 cm deep drainage lysimeters. Mean NO3-N levels in leachate beneath these areas were 3.8, 6.5, 93.5, 110, and 139 mg l-1 for the control, feces, and spring, summer, and fall applied urine. Extrapolation of this leaching data over a grazed landscape indicates that a grazing intensity for a 180-day grazing season on the order of 240 animal (mature Holstein cow) days (AD) ha-1 yr-1 can result in a leachate of 10 mg l-1 of NO3-N (the U.S. EPA Drinking Water Standard) under pasture fertilized with 220 kg N ha-1.

Last Modified: 8/24/2016
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