Document Detail
Grazing intensity effects on weed populations in annual and perennial pasture systems
Abstract/OtherAbstract :
Few studies report animal grazing effects on weed populations. A study was conducted to assess weed populations in annual and perennial forage grasses grazed at various intensities by cattle over a 4-yr period. The perennial forages were Bromus inermis and Bromus riparius, and the annual forages were winter Triticosecale and a mixture of Hordeum vulgare and winter Triticosecale. With few exceptions, results from the two annual pastures could be adequately described as a group, as could the results from the two perennial pastures. The two most prevalent weed species were Capsella bursa-pastoris and Taraxacum officinale; other species encountered over the course of the study were analyzed as a group. Tillage (seedbed preparation) in the annual system supported a proliferation of annual weeds in the spring. In the perennial pasture system, a lack of tillage and spring MCPA allowed T. officinale to increase as the study progressed, especially at the highest grazing intensity. In the perennial pastures, each unit increase in grazing intensity led to 51 more C. bursa-pastoris m−2 and 4 more T. officinale m−2. At lower levels of grazing intensity, C. bursa-pastoris and other species were most abundant in the annual pastures. Weed population shifts in response to grazing pressure in the annual pasture systems were restricted because of annual tillage and MCPA. Therefore, pasture managers may subject annual pastures to heavy grazing pressure with less negative weed population consequences than perennial pastures where herbicides are not applied. Nomenclature: MCPA; Capsella bursa-pastoris (L.) Medik. CAPBP, shepherdspurse; Taraxacum officinale Weber in Wiggers TAROF, dandelion; Bromus inermis Leyss. ‘Carlton’, smooth bromegrass; Bromus riparius Rhem. ‘Paddock’, meadow bromegrass; Hordeum vulgare L. ‘AC Lacombe’, barley; × Triticosecale Wittm. ‘Pika’, winter triticale.
Authors :
K.Neil Harker, Vern S. Baron, David S. Chanasyk, M. Anne Naeth, F. Craig Stevenson
Related Documents :
559944 - Grazing intensity effects on weed populations in annual and perennial pasture systems
1246024 - Monitoring fungi diseases in pine forests using ers-1 sar data
29267044 - Neutron and gamma dose rates determined in a cell phantom at the finnish bnct facility
Contributors :
Publication Detail :
Publisher :  Weed Science Society of America     Type :  Text     Format :  text/html    
Date Detail :
Subject :
Coverage :
Relation :
Source :
Copyright Information :
Other Details :
Languages :  en-US    
Export Citation :
APA/MLA Format     Download EndNote     Download BibTex

Previous Document:  Simulation of Chenopodium album seedling emergence
Next Document:  Behavior of sulfentrazone in ionic exchange resins, electrophoresis gels, and cation-saturated soils