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Published online 24 February 2006
Published in Crop Sci 46:902-909 (2006)
© 2006 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Five Decades of Alfalfa Cultivar Improvement

Impact on Forage Yield, Persistence, and Nutritive Value

JoAnn F. S. Lamba,*, Craig C. Sheafferb, Landon H. Rhodesc, R. Mark Sulcd, Daniel J. Undersandere and E. Charles Brummerf

a USDA-ARS Plant Science Research Unit and Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, 411 Borlaug Hall, 1991 Upper Buford Circle, Saint Paul, MN 55108
b Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, 411 Borlaug Hall, 1991 Upper Buford Circle, Saint Paul, MN 55108
c Dep. of Plant Pathology, Ohio State Univ., 2021 Coffey Road, Columbus, OH 43210-1086
d Dep. of Horticulture and Crop Sci., Ohio State Univ., 2021 Coffey Road, Columbus, OH 43210-1086
e Dep. of Agronomy, Univ. of Wisconsin-Madison, 1575 Linden Drive, Madison, WI 53706
f Raymond F. Baker Center for Plant Breeding, Dep. of Agronomy, Iowa State Univ., 1204 Agronomy Hall, Ames, IA 50010


Figure 1
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  		Fig. 1. Regression analyses of annual forage yield vs. cultivar-release date at (A) Wisconsin, (B) Ohio, (C) Minnesota, and (D) Iowa. Regressions were calculated only for years where forage yield differed among the cultivars.

 

Figure 2
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  		Fig. 2. Regression analysis of final stand estimates vs. cultivar-release date at all four locations. Regressions were calculated only for locations where final stand densities differed among the cultivars.

 




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