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Morphological Characteristics of Big Bluestem and Switchgrass Plants Divergently Selected for Seedling Tiller Number

^a South Dakota State Univ., Dep. of Animal and Range Sci., Box 2170, Brookings, SD, 57007-0392
^b USDA-ARS, 344 Keim Hall, Univ. of Nebraska, P.O. Box 830937, Lincoln, NE 68583

View larger version (32K): [in a new window]   Fig. 1. (a) Yield per plant, (b) leaf yield per plant, and (c) stem yield per plant of a three-cut harvest management schedule on spaced-planted big bluestem and switchgrass plants from populations developed by divergent selection for seedling tiller number and high shoot weight. The first, second, and third harvests were on 25 May, 13 July, and 1 Sept. 2000, respectively. Similar letters within a harvest and species indicate no significant difference at P > 0.05. Plant type BMT is big bluestem multiple tiller Cycle 2, BST is big bluestem single-tiller Cycle 2, SMT is switchgrass multiple-tiller Cycle 2, and SST is switchgrass single-tiller Cycle 2.

View larger version (35K): [in a new window]   Fig. 2. Yield per tiller, stem yield per tiller, and leaf yield per tiller for the (a) first harvest, 25 May 2000; (b) second harvest, 13 July 2000; and (c) third harvest, 1 Sept. 2000 of a three-cut harvest management schedule on spaced-planted big bluestem and switchgrass plants from populations developed by divergent selection for seedling tiller number and high shoot weight. Similar letters within a plant fraction (stem or leaf) among plant types and species indicate no significant difference at P > 0.05. Plant type BMT is big bluestem multiple-tiller Cycle 2, BST is big bluestem single-tiller Cycle 2, SMT is switchgrass multiple-tiller Cycle 2, and SST is switchgrass single-tiller Cycle 2.