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Species Population Dynamics in a Mixed Pasture under Two Rotational Sward Grazing Height Regimes

M. Carlassare and H. D. Karsten^*

Dep. of Crop and Soil Sciences, 116 ASI Building, The Pennsylvania State Univ., University Park, PA 16802

View larger version (32K): [in a new window]   Fig. 1. (a) Orchardgrass tiller density, (b) tiller dry weight, and (c) herbage mass at each grazing period in a mixed pasture rotationally stocked with cow–calf pairs under tall or short grazing height regimes at State College, PA. Vertical bars indicate 1 SE. (a) Tiller density differed significantly with grazing regime x grazing date and grazing date (P < 0.1); (b) tiller dry weight differed with grazing regime, grazing date, and their interaction (P < 0.1); (c) total production differed with grazing regimes and grazing date (P < 0.1).

View larger version (40K): [in a new window]   Fig. 2. (a) Orchardgrass, (b) Kentucky bluegrass, and (c) quackgrass tiller stage of development averaged across cycles and reported by average grazing date in the spring in a mixed pasture rotationally stocked with cow–calf pairs under tall or short grazing height regimes at State College, PA. Vertical bars indicate 1 SE. Percentage of Kentucky bluegrass flowering tillers differed between regimes (P < 0.1).

View larger version (33K): [in a new window]   Fig. 3. (a) Kentucky bluegrass tiller density, (b) tiller dry weight, and (c) herbage mass at each grazing period in a mixed pasture rotationally stocked with cow–calf pairs under tall or short grazing height regimes at State College, PA. Vertical bars indicate 1 SE. (a) Tiller density differed with grazing regime and grazing date (P < 0.1); (b) tiller dry weight differed with grazing regime, grazing date, and their interaction (P < 0.1); (c) total production differed with grazing regime and grazing date (P < 0.1).

View larger version (34K): [in a new window]   Fig. 4. (a) Quackgrass tiller density, (b) tiller dry weight, and (c) herbage mass at each grazing period in a mixed pasture rotationally stocked with cow–calf pairs under tall or short grazing height regimes at State College, PA. Vertical bars indicate 1 SE. (a) Tiller density differed with grazing regime (P < 0.1); (b) tiller dry weight differed with grazing date (P < 0.1); (c) total production differed with grazing date (P < 0.1).

View larger version (28K): [in a new window]   Fig. 5. (a) Dandelion leaf density, (b) leaf dry weight, and (c) herbage mass at each grazing period in a mixed pasture rotationally stocked with cow–calf pairs under tall or short grazing height regimes at State College, PA. Vertical bars indicate 1 SE. (a) Leaf density differed with grazing regime and grazing date (P < 0.1); (b) leaf dry weight differed with grazing date (P < 0.1); (c) total dandelion production differed with grazing date (P < 0.1).

View larger version (26K): [in a new window]   Fig. 6. (a) Total live pasture herbage mass and (b) dead material herbage mass (kg ha-1) at each grazing period in a mixed pasture rotationally stocked with cow–calf pairs under tall or short grazing height regimes at State College, PA. Vertical bars indicate 1 SE. Total pasture and dead material production differed with grazing regime, grazing date, and their interaction (P < 0.1).