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The Center for Native Grasslands Management

Title: Tiller defoliation patterns under short duration grazing in tallgrass prairie
Year: 1990
Author(s): Gillen, R. L., McCollum, F. T., Brummer, J. E.
Source Title: Journal of Range Management
Source Type: Journal
pages: 95-99
Original Publication: http://  
Abstract: Simulated 8-pasture short duration grazing systems were studied in 1985-86 to determine the effect of grazing schedule and stocking rate on defoliation patterns of individual grass tillers of big bluestem (Andropogon gerardii Vitmm) and little biuestem (ScI&rchyrium scopdwn (Michx.) Nash). Treatments consisted of 3 grazing schedules (2,3, or 4 rotation cycles per 152-day grazing season) and 2 stocking rates (1.3 and 1.8 times the recommended normal). Grazing schedule and stocking rate did not affect the percent tiller height reduction per grazing period except for the combination of 2-cycle grazing and heavy stockbrg which increased percent height reduction. Percent tiller height reduction per grazing period decreased over the grazing season for the 3 and 4-cycle grazing schedules. Grazing schedule and stocking rate had little effect on the height at which tillers were defoliated. Increasing the number of grazing periods reduced the percentage of tillers defoliated per grazing period but increased the cumulative defoliation frequency over the grazing season. Grazing schedule did not affect the percentage of tillers ungrazed over the entire grazing season. Big bluestem was consistently defoltated more intensely and frequently than little bluestem.