%0 Journal Article
%T Dinamica vegetacional em pastagem natural e pastagem sobresemeada com esp¨¦cies de esta  o 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
%A Carlos Eduardo Nogueira Martins
%A Fernando Luiz Ferreira de Quadros
%A Danieli Furian Araldi
%A Eduardo Londero Moojen
%J Acta Scientiarum : Animal Sciences
%D 2011
%I 
%X Objetivou-se avaliar os poss¨ªveis efeitos do uso do herbicida e da introdu  o de esp¨¦cies de esta  o fria na dinamica vegetacional da pastagem natural. Os tratamentos foram: pastagem natural com ro adas anuais (CN); pastagem natural melhorada com introdu  o de esp¨¦cies de esta  o fria e com aduba  o anual (CNI); idem ao anterior, mas com uma aplica  o de glifosato (G1); idem ao anterior, por¨¦m com tr¨ºs aplica  es de glifosato (G3); idem ao G3, mas com o dobro da aduba  o anual (GA3). A semeadura de trevo branco, cornich o e azev¨¦m anual foi feita a lan o, sendo esta precedida da aplica  o do herbicida glifosato. O sistema de pastejo foi o cont¨ªnuo com lota  o vari¨¢vel. Acomposi  o botanica observada foi diferente (p < 0,06) entre os tratamentos que n o receberam aplica  o de glifosato e aqueles em que se fez o uso do mesmo. A composi  o botanica dos tratamentos entre os per¨ªodos n o apresentou varia  o (p = 0,57). O uso do herbicida glifosato permite eficiente estabelecimento das esp¨¦cies introduzidas. Entretanto, n o se recomenda a utiliza  o desta pr¨¢tica por esta modificar a composi  o flor¨ªstica da pastagem natural. 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.
%K azev¨¦m anual
%K cornich o
%K glifosato
%K trevo branco
%K annual ryegrass
%K birdsfoot trefoil
%K glyphosate
%K white clover
%U http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/9148/9148