Root weight, area, and length of sand bluestem (Andropogon hallii) in Nebraska were reduced by defoliation during the growing season, with multiple defoliations having 2-3 times the impact than a single defoliation in June (the least detrimental). There was no difference in the concentration of TNC (total non-structural carbohydrates) between treatments, although TNC weight in the roots was reduced by 34% and 12% for multiple and single defoliation, respectively. Above-ground production was not affected by a single year defoliation (single or multiple), but the effects on roots could reduce plants ability to absorb water and nutrients and reduce its competitiveness. Grazing sand bluestem during the dormant season or once during the early part of the growing season should be least detrimental.
Citations and enhanced abstracts for journals articles and documents focused on rangeland ecology and management. RSIS is a collaboration between Montana State University, University of Idaho, and University of Wyoming.