||Tiller defoliation patterns under short duration grazing in tallgrass prairie
|| Gillen, R. L., McCollum, F. T., Brummer, J. E.
||Journal of Range Management
||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.