Acta Scientiarum: Animal Sciences (Apr 2011)

Dinâmica vegetacional em pastagem natural e pastagem sobresemeada com espécies de estação fria com e sem o uso de herbicida =Vegetation dynamics in natural pasture and pasture overseeded with cool season species with and without the use of herbicide

  • Carlos Eduardo Nogueira Martins,
  • Fernando Luiz Ferreira de Quadros,
  • Danieli Furian Araldi,
  • Eduardo Londero Moojen,
  • Duilio Guerra Bandinelli,
  • Fábio Cervo Garagorry

Journal volume & issue
Vol. 33, no. 2
pp. 123 – 129

Abstract

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Objetivou-se avaliar os possíveis efeitos do uso do herbicida e da introdução de espécies de estação fria na dinâmica vegetacional da pastagem natural. Os tratamentos foram: pastagem natural com roçadas anuais (CN); pastagem natural melhorada com introdução de espécies de estação fria e com adubação anual (CNI); idem ao anterior, mas com uma aplicação de glifosato (G1); idem ao anterior, porém com três aplicações de glifosato (G3); idem ao G3, mas com o dobro da adubação anual (GA3). A semeadura de trevo branco, cornichão e azevém anual foi feita a lanço, sendo esta precedida da aplicação do herbicida glifosato. O sistema de pastejo foi o contínuo com lotação variável. Acomposição botânica observada foi diferente (p This study evaluated the possible effects of the use of herbicide and introduction of cool season species on the dynamics of natural grassland vegetation. The treatments were: natural grassland withannual mowing (CN); natural grassland improved with introduction of cool season species and annual fertilization (CNI); same as the previous but with glyphosate application (G1); same as the previous with three glyphosate applications (G3); same as G3 but with doubleannual fertilizing (GA3). The sod seeding of white clover, birdsfoot trefoil and annual ryegrass was preceded by application of the herbicide glyphosate. The grazing system was continuous, with variable stocking rates. The observed botanical composition was different (p < 0.06) between treatments that did not receive glyphosate application and those with application. The botanical composition of the treatments did not present variation (p = 0.57) among periods. The use of glyphosate allows an efficient establishment of the introduced species. However, the use of this practice is not recommended due to its effects on modifying the floristic composition of the natural grassland.

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