Submitted to: Grassland International Congress Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 4/15/1997
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: Increasing use of intensive rotational grazing for livestock production in the USA raises questions about the potential for nitrate leaching losses. We conducted grazing experiments with lactating dairy cows at two sites in the Upper Midwest and monitored milk production, milk N yield, soil nitrate N concentration, and nitrate leaching. Treatments included different amounts of dietary supplement fed in addition to the pasture. Supplementation increased milk yield, but there was no measurable impact on nitrate leaching losses. Leaching volumes and nitrate losses were small on these silt loam soils, even directly under urine patches. The results suggest that N can be conserved efficiently in pastures on fine textured soils dominated by the deeply rooted perennial species typical of the Upper Midwest.