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Nitrogn Use and Biomass Distribution in Culms of Winter Wheat Populations Selected from Grain-Only and Dual-Purpose Systems

^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

View larger version (49K): [in this window] [in a new window]   Fig. 1. Anthesis traits of bulk subpopulations (Base, grain-only, and dual-purpose) generated for 12 unique wheat genetic backgrounds. Values are least squares means (n = 12) of three replications across 2 yr and two production systems. Within a genetic background set, bars followed by the same letter are not significantly (NS) different at P = 0.05 using Student's t test.

View larger version (48K): [in this window] [in a new window]   Fig. 2. Mature traits of bulk subpopulations (Base, grain-only, and dual-purpose) generated for 12 unique wheat genetic backgrounds. Values are least squares means (n = 12) of three replications across 2 yr and two production systems. Within a genetic background set, bars followed by the same letter are not significantly (NS) different at P = 0.05 using Student's t test.

View larger version (20K): [in this window] [in a new window]   Fig. 3. Harvest index (HI) and nitrogen harvest index (NHI) of wheat culms for 12 unique wheat genetic backgrounds. Values are least squares means (n = 36) of three replications across 2 yr, two production systems, and three subpopulations. The HI bars with the same lowercase letters and the NHI bars with the same uppercase letters are not significantly different according to Tukey–Kramer mean comparison test at P = 0.05.