Your search for keyword(s) "grazing intensity" resulted in 35 record(s).

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Title: Grazing management and nitrogen fertilization effects on vaseygrass persistence in limpograss pastures: Journal: Crop Science; Authors: Y. C. Newman, and L. E. Sollenberger; Date: 2005; Summary: Effects of grazing management and N fertilization on the persistence of vaseygrass (Paspalum urvillei), a weedy species in limpograss (Hemarthria altissima) pastures were examined at the Beef Research Unit at the University of Florida Gainesville (29° 38\' N; 82° 22\'W). Six treatments combinations of grazing regimes (continuous or rotational), stubble height (15 cm or 30 cm) and fertilizer application rates (50 or 150 kg N ha^-1) were applied to 16 plots in a split-plot design. Treatment effects were measured on ...; Agrovoc Control Words: Weeds, Fertilizer application, Grazing; View more details about this article

Title: Stocking rate, precipitation, and herbage production on sand sagebrush-grassland: Journal: Rangeland Ecology & Management; Authors: R. L. Gillen, and P. L. Sims; Date: 2004; Summary: Gillen and Sims determined the impact of stocking rate on herbaceous production of a sand sagebrush (Artemisia filifolia)-grassland. Grasses contributed 89% of the total herbaceous production averaged over stocking rates and years, while forbs contributed 11%. Total production averaged 1,540, 1,470, and 1,450 kg/ha for stocking rates at 43, 57, and 85 AUD/ha, respectively. The results suggest that long term grazing cattle at the tested stocking rates would not affect annual production or species composition. Therefore, the authors conclude that continuous grazing is su ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Dynamics of foraging behavior associated with variation in habitat and forage availability in captive black brant (Branta bernicla nigricans) goslings in Alaska: Journal: The Auk; Authors: M. P. Herzog, and J. S. Sedinger; Date: 2004; Summary: The effect of different grazing intensities (no grazing, light, moderate, and heavy) of Black Brant (Branta bernicla) gosling on grazing lawns planted to Carex subspathacea and native slough levees (T. palustris) was measured on the Yukon-Kuskokwim Delta, Alaska (61Ëš N, 165Ëš W). Above ground biomass and offtake of biomass was measured pre-, mid-(after 4 h), and post-trial (8 h) in both habitats. Offtake was calculated as the difference between the average biomass measured before and after a given portion of treatment. Every two hours of ...; Agrovoc Control Words: Riparian zones, Grazing, Wildlife; View more details about this article

Title: Productivity of chicory and plantain cultivars under grazing: Journal: Agronomy Journal; Authors: M. Labreveux, M. H. Hall, and M. A. Sanderson; Date: 2004; Summary: The authors of this study tested the production and survival of chicory (Cichorium intybus) and plantain (Plantago lanceolata) cultivars under different summer grazing regimes to determine if any of these cultivars would have greater summer forage production than 'Pennlate' orchardgrass (Dactylis glomerata) in Pennsylvania pastures. After the first growing season several cultivars were removed from the study because they were not suited to the grazing regimes or the Pennsylvania climate, leaving only one plantain (Lancelot plantai ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Effects of grazing intensity on growth, reproduction, and abundance of three palatable forbs in Kansas tallgrass prairie: Journal: Plant Ecology; Authors: K. R. Hickman, and D. C. Hartnett; Date: 2002; Summary: Composition, growth, and reproduction of Aster ericoides, Ruellia humilis, and Amorpha canescens were measured in pastures that were ungrazed or stocked lightly, moderately, or highly with cattle to determine the impacts of different grazing intensities on these subdominant forbs. Stem height and biomass of R. humilis and A. ericoides decreased as grazing intensity increased. Reproductive effort and height of A. canescens decreased with increasing grazing intensity bu ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Long-term influences of livestock management and a non-native grass on grass dynamics in the desert grassland: Journal: Journal of Arid Environments; Authors: D. L. Angell, and M. P. McClaran; Date: 2001; Summary: Angell and McClaran examined the relationship between a variety of grazing regimes and grass species densities in an Arizona desert grassland, over 28 years. Grass density was not related to the intensity of livestock grazing. Only one native species, bush muhly (Muhlenbergia porteri), a grass with known sensitivity to summer defoliation, was less dense in pastures without periodic summer rest. Further, the introduced pasture grass Lehmann lovegrass (Eragrostis lehmanniana) increased similarly under all treatments to dominate the pastures by the end of the study period. In general, native ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Grazing impacts on soil nitrogen and phosphorus under parkland pastures: Journal: Journal of Range Management; Authors: V. S. Baron, A. C. Dick, E. Mapfumo, S. S. Malhi, M. A. Naeth, D. S. Chanasyk; Date: 2001; Summary: Soil nutrients were measured for 4 years in pastures under heavy, moderate, and light grazing intensities, that were seeded with one of three species (smooth bromegrass (Bromus inermis), meadow bromegrass (Bromus riparius) or winter triticale (X Triticosecale), to determine the effects of grazing intensity and forage species on soil N and P levels. After the third year of grazing, increasing grazing intensity increased nitrate, mineral N, and phosphorous levels in the soil, most likely because 2.4x more feces was deposited on heavily grazed pastures than on lightly grazed pastures. Forage sp ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Plant biodiversity on shortgrass steppe after 55 years of zero, light, moderate, or heavy cattle grazing: Journal: Plant Ecology; Authors: R. H. Hart; Date: 2001; Summary: Plant biodiversity and evenness on shortgrass steppe range in Colorado were greater in light and moderately grazed pastures than ungrazed or heavily grazed pastures after 55 years of treatment. While preferred grasses western wheatgrass (Pascopyrum smithii), and needle-and-thread (Stipa comata) were present significantly only in the light and ungrazed pastures (0.8-7.2 % of biomass), plains pricklypear (Opuntia polyacantha) dominated the ungrazed pasture, contributing 43% of biomass. Blue grama (Bouteloua gracilis; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Predicting plant species' responses to grazing

Journal: Journal of Applied Ecology

Authors: P. A. Vesk, and M. Westoby

Date: 2001

Summary: The consistency of plant species response to livestock grazing for the purpose of predicting vegetation dynamics and identifying plant functional types and traits was examined. Research and conclusions were formed by analyzing the results from 35 published studies from across Australia that examined data on species composition changes from grazing using a data set of 1,554 grazing responses from 829 species. This study examined two basic questions 1) what shared responses do species exhibit from grazing disturbance and 2) what are the central ranges of among-species variation to grazing distur ...

Agrovoc Control Words: Australia, Rangelands, Grazing intensity

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Title: Carbon exchange rates in grazed and ungrazed pastures of Wyoming

Journal: Journal of Range Management

Authors: D. R. LeCain, J. A. Morgan, G. E. Schuman, J. D. Reeder, and R. H. Hart

Date: 2000

Summary: In this study, LeCain et al. measured the effects of light and heavy grazing on carbon exchange, soil respiration and vegetation characteristics, in the Wyoming mixed-grass prairie. Seasonal averages did not vary for any of the measured parameters, however, there were differences when comparisons were made for measurements within the season. In general, carbon exchange rates and green vegetation indices tended to be greater early in the season and lower later in the season in both grazed pastures when compared to the ungrazed pasture. However, since average seasonal differences were limited ...

Agrovoc Control Words: Riparian zones, Rangelands, Wildlife

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Title: Nonpoint-source pollutant load reductions associated with livestock exclusion

Journal: Journal of Environmental Quality

Authors: D. E. Line, W. A. Harman, G. D. Jennings, E. J. Thompson, and D. L. Osmond

Date: 2000

Summary: Water quality was measured before and after improvements were made in two grazed pastures. An alternate water source was installed in a lightly grazed pasture, and an alternate water source, riparian fencing and plantings were installed in a heavily grazed pasture. The alternate water source did not significantly reduce the amount of pollutants entering the stream from the lightly grazed pasture. However, the The effectiveness of best management practices (BMP, including livestock exclusion, alternative water sources and planting trees on riparian corridor (or natural revegetation) in reduc ...

Agrovoc Control Words: Riparian zones, Grazing, Nonpoint pollution

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Title: Effects of summer sheep grazing on browse nutritive quality of autumn and winter

Journal: Journal of Wildlife Management

Authors: M. J. Alpe, J. L. Kingery, and J. C. Mosley

Date: 1999

Summary: Forage quality was measured after early-summer and late-summer sheep grazing in Idaho pastures to determine the value of summer grazing as a tool to enhance browse nutritive quality for autumn and winter ungulate use. Early summer grazing enhanced the autumn quality of 5 out of 6 browse species measured, whereas late season grazing only increased the autumn quality of one species and decreased the quality of 3 species, when compared to ungrazed control plants. Winter browse quality of 4 out of 6 species was enhanced by early summer grazing, while late season grazing increased the quality of ...

Agrovoc Control Words: Riparian zones, Rangelands, Wildlife

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Title: Soil water regimes of rotationally grazed perennial and annual forages

Journal: Canadian Journal of Soil Science

Authors: D. A. Twerdoff, D. S. Chanasyk, M. A. Naeth, V. S. Baron, and E. Mapfumo

Date: 1999

Summary: The soil water regime of perennial and annual forages under three grazing intensities (heavy, medium and light) and four plant communities (meadow brome, barely/triticale, triticale and smooth brome) was characterized at the Lacombe Research Station (52Â° 28â€™ N; 113Â° 45â€™ W) in Alberta. Volumetric soil water content was measured biweekly from April to October during two summers. Aboveground net productivity, surface soil water, accumulated soil water, evapotranspiration, water-use efficiency, wilting point and field capacity were also measured once ...

Agrovoc Control Words: Rangelands, Grazing, Soil water

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Title: Runoff and sediment yield under grazing in foothills fescue grasslands of Alberta

Journal: Water Resources Bulletin

Authors: M. A. Naeth, and D. S. Chanasyk

Date: 1996

Summary: Naeth and Chanasyk quantified the effects of short duration and continuous (season-long) grazing systems on runoff and sediment yield from sloped areas of the foothills fescue grasslands of Alberta. The majority of annual runoff occurred during snowmelt. Snowmelt runoff decreased with increasing grazing intensity and was generally higher from the two heavy treatments and the control than from the severe treatments, due to the higher accumulated snow in the former treatments, which in turn, was due to higher standing vegetation and litter in those areas. Thus, any grazing regime that reduces ...

Agrovoc Control Words: Riparian zones, Rangelands, Wildlife

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Title: Yield of selected and unselected bahiagrass populations at two cutting heights

Journal: Crop Science

Authors: C. G. S. Pedreira, and R. H. Brown

Date: 1996

Summary: Pedreira and Brown measured plant production of three bahiagrass (Paspalum notatum) populations (Pensacola, Tifton 9 and Tifton 14), when plants were exposed to light (10 cm stubble height) or heavy (3.5 cm stubble height) simulated herbivory in this study. Tifton 9 and 14 produced more above-ground biomass than Pensacola plants under light and heavy grazing pressure. Stubble and rhizome yield were highest under light grazing and were always greater for Pensacola plants than Tifton 9 or 14. Based on these results the authors suggest that Tifton 9 and 14 would produce mo ...

Agrovoc Control Words: Riparian zones, Rangelands, Wildlife

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