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Registro Completo |
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Biblioteca(s): |
Embrapa Meio-Norte; Embrapa Pantanal. |
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Data corrente: |
09/01/1998 |
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Data da última atualização: |
26/03/1998 |
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Autoria: |
KEMP, D. R.; DOWLING, P. M.; MICHALK, D. L. |
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Título: |
Managing the composition of native and naturalised pastures with grazing. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
New Zealand Journal of Agricultural Research, v.39, n.4, p.569-578, 1996. |
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Idioma: |
Inglês |
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Conteúdo: |
Many native, naturalised, and low-input pastures have a low proportion of densirable species. Under the prevailing economic conditions, it is unikely that these pastures would be replaced with sown native species as there may not be seed of suitable cultivars available and costs would exceed returns. Better management is a preferable strategy to improve the proportion of desirable components. Grazing tactics are central to any improved management strategies for these pastures as they offer a lower cost option for land managers. Additional tactics, which will vary depending upon specific circumstances, include some use of fertiliser (to increase the rate of change), herbicides (where weed problems are particularly severe and animals are unlikely to eat the "weeds"), and fire (to reduce dead material and seed numbers and produce green leal for grazing). Several examples of manipulating pasture composition are considered. In situations where the desirable species are C3 perennial grasses (e.g., Danthonia spp., Microlaena, and Dactylis), and the less desirable are C3 annual species (e.g., Vulpia), rests over the summer period, especially in wetter years, improved the perennial grass content. In addition, extra grazing pressure in spring limits seed set by annual grasses. Where the undesirable species are C4 perennial grasses (e.g., Bothriochloa and Aristida), heavy summer grazing is more important. In some instances, the timing of a heavy grazing period will depend upon monitoring the plant community to find the "window of opportunity" when the desirable species have commpleted flowering and seed set but when the less-desirable species are starting to flower. Further development of improved management systems will require knowledge of the ecology of the principal species. Any release of new cultivars of native and low-input species should be supported by knowledge of the better management practices to maintain those species in the pasture. MenosMany native, naturalised, and low-input pastures have a low proportion of densirable species. Under the prevailing economic conditions, it is unikely that these pastures would be replaced with sown native species as there may not be seed of suitable cultivars available and costs would exceed returns. Better management is a preferable strategy to improve the proportion of desirable components. Grazing tactics are central to any improved management strategies for these pastures as they offer a lower cost option for land managers. Additional tactics, which will vary depending upon specific circumstances, include some use of fertiliser (to increase the rate of change), herbicides (where weed problems are particularly severe and animals are unlikely to eat the "weeds"), and fire (to reduce dead material and seed numbers and produce green leal for grazing). Several examples of manipulating pasture composition are considered. In situations where the desirable species are C3 perennial grasses (e.g., Danthonia spp., Microlaena, and Dactylis), and the less desirable are C3 annual species (e.g., Vulpia), rests over the summer period, especially in wetter years, improved the perennial grass content. In addition, extra grazing pressure in spring limits seed set by annual grasses. Where the undesirable species are C4 perennial grasses (e.g., Bothriochloa and Aristida), heavy summer grazing is more important. In some instances, the timing of a heavy grazing period will depend upon monitori... Mostrar Tudo |
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Palavras-Chave: |
Composicao; Composition; Forrageira; Management; Native grasses; Pasture. |
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Thesagro: |
Composição Botânica; Manejo; Pastagem Nativa. |
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Thesaurus Nal: |
grazing. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02681naa a2200265 a 4500
001 1052230
005 1998-03-26
008 1996 bl --- 0-- u #d
100 1 $aKEMP, D. R.
245 $aManaging the composition of native and naturalised pastures with grazing.
260 $c1996
520 $aMany native, naturalised, and low-input pastures have a low proportion of densirable species. Under the prevailing economic conditions, it is unikely that these pastures would be replaced with sown native species as there may not be seed of suitable cultivars available and costs would exceed returns. Better management is a preferable strategy to improve the proportion of desirable components. Grazing tactics are central to any improved management strategies for these pastures as they offer a lower cost option for land managers. Additional tactics, which will vary depending upon specific circumstances, include some use of fertiliser (to increase the rate of change), herbicides (where weed problems are particularly severe and animals are unlikely to eat the "weeds"), and fire (to reduce dead material and seed numbers and produce green leal for grazing). Several examples of manipulating pasture composition are considered. In situations where the desirable species are C3 perennial grasses (e.g., Danthonia spp., Microlaena, and Dactylis), and the less desirable are C3 annual species (e.g., Vulpia), rests over the summer period, especially in wetter years, improved the perennial grass content. In addition, extra grazing pressure in spring limits seed set by annual grasses. Where the undesirable species are C4 perennial grasses (e.g., Bothriochloa and Aristida), heavy summer grazing is more important. In some instances, the timing of a heavy grazing period will depend upon monitoring the plant community to find the "window of opportunity" when the desirable species have commpleted flowering and seed set but when the less-desirable species are starting to flower. Further development of improved management systems will require knowledge of the ecology of the principal species. Any release of new cultivars of native and low-input species should be supported by knowledge of the better management practices to maintain those species in the pasture.
650 $agrazing
650 $aComposição Botânica
650 $aManejo
650 $aPastagem Nativa
653 $aComposicao
653 $aComposition
653 $aForrageira
653 $aManagement
653 $aNative grasses
653 $aPasture
700 1 $aDOWLING, P. M.
700 1 $aMICHALK, D. L.
773 $tNew Zealand Journal of Agricultural Research$gv.39, n.4, p.569-578, 1996.
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Registro original: |
Embrapa Meio-Norte (CPAMN) |
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