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    • Rangeland Ecology & Management, Volume 65 (2012)
    • Rangeland Ecology & Management, Volume 65, Number 5 (September 2012)
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    Summer and Winter Defoliation Impacts on Mixed-Grass Rangeland

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    Author
    Smart, Alexander J.
    Gates, Roger N.
    Johnson, Patricia S.
    Schafer, Rebecca
    Issue Date
    2012-09-01
    Keywords
    clipping
    dormant season
    growing season
    utilization
    
    Metadata
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    Citation
    Smart, A. J., Gates, R. N., Johnson, P. S., & Schafer, R. (2012). Summer and winter defoliation impacts on mixed-grass rangeland. Rangeland Ecology & Management, 65(5), 506-515.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/642660
    DOI
    10.2111/REM-D-11-00173.1
    Additional Links
    https://rangelands.org/
    Abstract
    Combined growing- and dormant-season pasture use has potential to increase herbage harvest without causing the undesirable shift in species composition that occurs with excessive utilization. The objective of this study was to determine the effect of summer clipping on winter pastures and winter clipping on summer pastures regarding standing crop, plant community composition, and forage quality. The study was conducted from 2003-2006 at the Antelope and Cottonwood Research Stations located in the mixed-grass prairie of western South Dakota. At each location, the experimental design was a randomized complete block with three replications that included 18 clipping treatments arranged as a split-split plot. Whole plots consisted of four summer clipping dates (May-August). Subplot treatments were two clipping intensities (clipped to residual height to achieve 25% or 50% utilization). Sub-subplots consisted of two winter clipping intensities (unharvested or clipped to a residual height to achieve a total utilization of 65%). Two winter control treatments were arranged in the subplot and split into two clipping intensities of 50% and 65% utilization. Winter biomass for the May 25% clipping treatment was similar to winter biomass for winter-only clipping. No increase in forage quality resulted from summer clipping compared with winter clipping. Three consecutive yr of combined growing-season and dormant-season defoliation to 65% utilization resulted in no change in functional group composition compared with <50% utilization treatments. Clipping in June resulted in reduced midgrass biomass at both stations and increased shortgrass biomass at Cottonwood. Results suggest that producers could combine growing and dormant-season grazing to increase the harvest of herbage on mixed-grass prairie, but should change season of use periodically to avoid an undesirable shift in plant composition./La combinación en el uso de temporada de crecimiento y dormancia en praderas tiene el potencial de aumentar la cosecha deforraje sin causar el indeseable cambio en la composición de especies que ocurre con la utilización excesiva. El objetivo de este estudio fue determinara el efecto de cortes de verano en praderas de invierno y cortes de invierno en praderas de verano en relación a forraje en pie, composición de las comunidades de plantas y calidad del forraje. El estudio se realizó de 2003 a 2006 en la Estaciones Experimentales de Antelope y Cottonwood ubicadas en la pradera de pastos mixtos en el oeste de South Dakota. En cada lugar, el diseño experimental fue bloques completamente al azar con tres repeticiones que incluían 18 tratamientos de cortes en un arreglo de parcelas y sub-subparcelas divididas. Las parcelas completas consistieron en cuatro fechas de corte de verano (Mayo–Agosto). Los tratamientos de subparcela fueron dos intensidades de corte (cortes con altura residual para lograr el 25% o 50% de utilización). Las sub-subparcelas consistieron en dos intensidades de corte en invierno (sin cosecha o corte a altura residual para lograr un 65% de utilización total). Dos tratamientos testigos fueron arreglados en subparcela y separados en dos intensidades de corte de 50% y 65% de utilización). La biomasa de invierno para el tratamiento del 25% de Mayo fue similar a la biomasa de invierno para los cortes solo de invierno. No hubo aumento en la calidad del forraje de los cortes de verano comparado con los cortes de invierno. La combinación de tres años consecutivos de defoliación en temporada de crecimiento y dormancia al 65% de utilización resultaron en ningún cambio en la funcionalidad de la composición del grupo comparado con <50% de tratamientos de utilización. Los cortes en Junio resultaron en reducción de biomasa de pastos medianos en ambas estaciones y aumento en la biomasa de pastos cortos en Cottonwood. Los resultados sugieren que los productores podrán combinar el pastoreo en temporadas de crecimiento y dormancia para aumentar la cosechade forraje en praderas mixtas, pero deberán cambiar temporadas de uso periódicamente para evitar cambios no deseados en la composición de plantas.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/REM-D-11-00173.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 65, Number 5 (September 2012)

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