Fifty years of environmental progress for United States dairy farms.

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作者： C A,Rotz ^[1] ; D,Beegle ^[2] ; J K,Bernard ^[3] ; A,Leytem ^[4] ; G,Feyereisen ^[5] ; R,Hagevoort ^[6] ; J,Harrison ^[7] ; G,Aksland ^[8] ; G,Thoma ^[9]

作者单位： USDA-ARS, Pasture Systems and Watershed Management Research Unit, University Park, PA 16802. Electronic address: al.rotz@usda.gov. ^[1] Emeritus, Department of Plant Science, The Pennsylvania State University, University Park, PA 16802. ^[2] Emeritus, Department of Animal and Dairy Science, University of Georgia, Tifton, GA 30602. ^[3] USDA-ARS, Northwest Irrigation and Soils Research, Kimberly, ID 83341. ^[4] USDA-ARS, Soil and Water Management Research, St. Paul, MN 55108. ^[5] Department of Animal Sciences and Natural Resources, New Mexico State University, Clovis, NM 88101. ^[6] Emeritus, Department of Animal Sciences, Washington State University, Puyallup, WA 98371. ^[7] Agronomic Services, Visalia, CA 93291. ^[8] AgNext, Colorado State University, Fort Collins, CO 80523. ^[9]

关键词 Integrated Farm System Model (IFSM)dairy farm environmental impact gaseous emission life cycle assessment