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United States Department of Agriculture

Agricultural Research Service

Title: Nitrogen Cycling in Management Intensive Grazing

Authors
item Russelle, Michael
item Johnson, Dennis - UNIVERSITY OF MINNESOTA
item Satter, Larry
item Dhiman, Tilak - UTAH STATE UNIVERSITY
item Kanneganti, V - UNIVERSITY OF WISCONSIN
item Garcia, Alvaro - UNIVERSITY OF MINNESOTA
item Nord, William - UNIVERSITY OF MINNESOTA

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: August 1, 1997
Publication Date: N/A

Technical Abstract: Does increasing use of management intensive grazing on dairies in the Upper Midwest USA increase the potential for NO3 leaching losses? We determined NO3 lost under grazing versus mown systems, and whether dietary supplementation decreased NO3 losses by improving the conversion of feed N to milk N. In grazing experiments with lactating dairy cows on silt loam soils in south central WI and western MN, we monitored milk production, soil NO3 concentration, and NO3 losses. Dietary supplementation increased milk yield in two site years but not in a third. Nitrate leaching was insignificant in all cases, even directly under urine patches. With good animal and fertilizer management on these deep, fine-textured soils, NO3 leaching losses probably are minimal for midwestern pastures dominated by deeply rooted perennial species, and supplemental feed appears to be profitable.

Last Modified: 9/21/2014
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