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Species Contribution to Seasonal Productivity of a Mixed Pasture under Two Sward Grazing Height Regimes

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

View larger version (33K): [in a new window]   Fig. 1. The total (a) live, (b) dead, and (c) orchardgrass herbage harvested (kg ha-1) at each grazing event from a mixed pasture rotationally grazed with cow–calf pairs under tall or short grazing height regimes (harvested at 7 or 5 cm, respectively) at State College, PA. Grazing date, grazing regime, and their interaction differed significantly for total live, dead, and orchardgrass herbage harvested at P < 0.05.

View larger version (36K): [in a new window]   Fig. 2. (a) Orchardgrass, (b) bluegrass, and (c) quackgrass tiller stage of development in spring in a mixed pasture rotationally grazed with cow–calf pairs under tall or short grazing height regimes at State College, PA. In the tall and short grazing regimes, orchardgrass and quackgrass were harvested at 7 and 5 cm, respectively, and bluegrass was harvested at 5 and 3 cm, respectively. Bluegrass percentage of flowering tillers differed significantly between regimes at P < 0.05. Orchardgrass and quackgrass percentage of flowering tillers did not differ significantly between grazing regimes.

View larger version (62K): [in a new window]   Fig. 3. (a) Bluegrass herbage harvested at 5 cm (tall pastures) and 3 cm (short pastures), and (b) quackgrass, (c) dandelion, (d) other species, (e) tall legumes, and (f) white clover herbage harvested (kg ha-1) at 7 cm (tall pastures) and 5 cm (short pastures) at each grazing period from a mixed pasture rotationally grazed with cow–calf pairs under tall or short grazing height regimes in State College, PA. Grazing regime and grazing date differed significantly at P < 0.05 for herbage harvested of quackgrass, other species, and tall legumes. Bluegrass and dandelion herbage harvested was significantly influenced by date of grazing and the interaction of grazing regime and date of grazing. White clover was significantly influenced by grazing date but not by grazing regime nor the interaction of grazing date and grazing regime.

View larger version (38K): [in a new window]   Fig. 4. (a) Total herbage harvested and (b) total herbage mass (kg ha-1) over the 2.3-yr experiment in a mixed pasture rotationally grazed with cow–calf pairs under tall or short grazing height regimes in State College, PA. In the tall and short grazing regimes, bluegrass was harvested at 5 and 3 cm, respectively; all other species were harvested at 7 and 5 cm, respectively. Letters indicate species that differed significantly among species at P < 0.05. Species that differed between grazing regimes at P < 0.05 are indicated with *. Species that differed between grazing regimes at P < 0.01 are indicated with .

View larger version (38K): [in a new window]   Fig. 5. Pasture and species harvest index (HI) over the 2.3 yr from a mixed pasture rotationally grazed with cow–calf pairs under tall or short grazing height regimes in State College, PA. In the tall and short grazing regimes, bluegrass was harvested at 5 and 3 cm, respectively; all other species were harvested at 7 and 5 cm, respectively. Letters indicate species with HIs that differed significantly among species at P < 0.05. Dandelion HI differed between grazing regimes at P < 0.01 and is indicated with ; HIs of all other species did not differ between grazing regimes.