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Com objetivo de avaliar o efeito de herbicidas dessecantes sobre pastagens nativas constituídas por diferentes espécies do gênero Paspalum, adequando-as a semeadura direta ou a sobressemeadura de espécies de interesse forrageiro, foram conduzidos três experimentos na região fisiográfica da Depressão Central do Rio Grande do Sul. No primeiro experimento, em 1995/96, avaliou-se glyphosate a 360, 720 e 1080g ha-1 de equivalente ácido, aspergido nos volumes de calda de 50 e 200<img border=0 width=32 height=32 id="_x0000_i1025" src="../../../../img/revistas/cr/v31n4/a05img01.gif"> ha-1 e as espécies de Paspalum identificadas foram P. pumilum e P. notatum var. notatum biótipo "C" e "D". No segundo, em 1996, avaliou-se glyphosate a 720, 1080, 1440 e 1880g ha-1 de equivalente ácido e as espécies de Paspalum identificadas foram P. plicatulum, P. nicorae, P. notatum var. notatum biótipo "A", P. pumilum e P. maculosum. No terceiro, em 1997, avaliou-se glyphosate a 180, 270, 360, 450, 540, 720 e 1080g ha-1 de equivalente ácido e paraquat a 600 e 800g ha-1 de ingrediente ativo, e onde foram identificadas as espécies P. notatum var. saurae, P. notatum var. notatum biótipo "A" e P. pumilum. O herbicida glyphosate a 1080, 1440 e 1880g ha-1 é adequado quando se deseja controlar a pastagem nativa para introdução de semeadura direta, enquanto que glyphosate a 180, 270, 360 e 450g ha-1 e o paraquat a 600 e 800g ha-1, são adequados quando se deseja realizar a sobressemeadura de espécies forrageiras. A seleção dos herbicidas e das doses, dependerá da espécie de Paspalum dominante na pastagem nativa. The objective of this report was to evaluate the effect of desiccant herbicides on native pasture constituted of different species of the Paspalum gender, to adequate it to no-till system or to introduce forage species. Three experiments were carried out in the "Depressão Central Region" in the State of Rio Grande do Sul, Brazil. In the first, during 1995/96, glyphosate was applied in the rates of 360, 720 and 1080g ha-1 of acid equivalent, sprayed at two volumes (50 and 200<img border=0 width=32 height=32 id="_x0000_i1026" src="../../../../img/revistas/cr/v31n4/a05img01.gif"> ha-1) and the species of Paspalum identified were P. pumilum and P. notatum var. notatum biotypes "C" and "D".. In the second, in 1996, were evaluated glyphosate in rates of 720, 1080 and 1880g ha-1 of acid equivalent, sprayed in the volume of 100<img border=0 width=32 height=32 id="_x0000_i1027" src="../../../../img/revistas/cr/v31n4/a05img01.gif"> ha-1 and the species of Paspalum identified were P. plicatulum, P. nicorae, P. notatum var. notatum biotype "A", P. pumilum and P. maculosum. In the third, in 1997, glyphosate were evaluated in rates of 180, 270, 360, 450, 540, 720 and 1080g ha-1 of acid equivalent, paraquat in rates of 600 and 800g ha-1 of active ingredient, sprayed in volume of 100<img border=0 width=32 height=32 id="_x0000_i1028" src="../../../../img/revistas/cr/v31n4/a05img01.gif"> ha-1 and where were identified the P. notatum var. saurae, P. notatum var. notatum biotype "A" and P. pumilum. The use of herbicide glyphosate in rates of 1080, 1440 and 1880g ha-1 is adequate when the control of native pasture is desired to introduce the no-till system. The use of ghyphosate in rates of 180, 270, 360 and 450g ha-1 and paraquat in rates of 600 and 800g ha-1 are adequate when the introducing of forage species is desired. The selection of the herbicides and adequate rate will depend on the predominant Paspalum specie on native pasture

Aplicação de herbicidas dessecantes em pastagens nativas construídas por differentes espécies do gênero Paspalum