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Published online 1 January 2005
Published in Crop Sci 45:322-328 (2005)
© 2005 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Fall Forage Biomass and Nitrogen Composition of Winter Wheat Populations Selected from Grain-Only and Dual-Purpose Environments

Charles T. MacKowna,* and Brett F. Carverb

a USDA-ARS, Grazinglands Research Lab., 7207 W. Cheyenne St., El Reno, OK 73036
b Dep. of Plant and Soil Sciences, 368 Ag Hall, Oklahoma State Univ., Stillwater, OK 74078


Figure 1
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  		Fig. 1. Generation sequence of base (B) and selected (grain-only, GO; dual-purpose, DP) bulk subpopulations of winter wheat used for testing in a DP system.

 

Figure 2
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  		Fig. 2. Forage biomass of base (B) and selected (grain-only, GO; dual-purpose, DP) bulk subpopulations of two nurseries (Nursery 1 and Nursery 2) managed as DP wheat crops in 2001 and 2002. Biomass mean bars having the same letter within a year-by-nursery combination are not significantly different ({alpha} = 0.10).

 

Figure 3
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  		Fig. 3. Forage total N of base (B) and selected (grain-only, GO; dual-purpose, DP) bulk subpopulations of two nurseries (Nursery 1 and Nursery 2) managed as DP wheat crops in 2001 and 2002. Total N mean bars having the same letter within a year-by-nursery combination are not significantly different ({alpha} = 0.05).

 

Figure 4
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  		Fig. 4. Mean forage nitrate concentrations of genetic background entries in two nurseries (Nursery 1 and Nursery 2; 12 unique backgrounds in each nursery) managed as dual-purpose (DP) wheat crops in 2001 and 2002. Means are averages across the base (B) and selected (grain-only, GO; DP) bulk subpopulations. Each horizontal gray bar within a nursery marks the yearly 25 to 75% quartiles.

 




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