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Water quality implications of dairy slurry applied to cut pastures in the northeast USA
- Source :
- Soil Use & Management; Sep2000, Vol. 16 Issue 3, p189, 0p
- Publication Year :
- 2000
-
Abstract
- Nitrate nitrogen (NO<subscript>3</subscript>-N) leaching from animal production systems in the northeast USA is a major non-point source of pollutionin the Chesapeake Bay. We conducted a study to measure NO<subscript>3</subscript>-N leaching from dairy slurry applied to orchardgrass (Dactylis glomerata L., cv. Pennlate) using large drainage lysimeters to measure the direct impact of four rates of slurry (urine and faeces) N application (0, 168, 336, 672 kg N ha<superscript>-1</superscript> yr<superscript>-1</superscript>) on NO<subscript>3</subscript>-N leaching on three soil types. We then used experimentally-based relationships developed earlier between stocking density and NO<subscript>3</subscript>-N leaching loss and leachate NO<subscript>3</subscript>-N concentration to estimate the added impact of animal grazing. Nitrate N leaching losses from only dairy slurry applied at the 0, 158, 336, and 672 kg N ha<superscript>-1</superscript> yr<superscript>-1</superscript> rates were 5.85, 8.26, 8.83, and 12.1 kg N ha<superscript>-1</superscript> yr<superscript>-1</superscript>, respectively with corresponding NO<subscript>3</subscript>-N concentrations of 1.60, 2.30, 2.46, and 3.48 mg l<superscript>-1</superscript>. These NO<subscript>3</subscript>-N concentrations met the 10 mgl<superscript>-1</superscript> US EPA drinking water standard. However, when a scenario was constructed to include the effect of NO<subscript>3</subscript>-N leaching caused by animal grazing, the NO<subscript>3</subscript>-N drinking water standard was calculated to be exceeded. [ABSTRACT FROM AUTHOR]
- Subjects :
- LEACHING
SOIL science
WATER quality
LIVESTOCK
GROUNDWATER pollution
MANURES
Subjects
Details
- Language :
- English
- ISSN :
- 02660032
- Volume :
- 16
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Soil Use & Management
- Publication Type :
- Academic Journal
- Accession number :
- 8388672