04477nab a2200301 i 4500003000900000005001700009008004100026040001800067072000800085100001500093100001700108100001900125100001700144100002100161100001700182100001600199245008100215500007600296520165600372520180902028650001703837650001203854650001503866650001303881650001303894773019103907856007704098BR-BrBNA20230904101549.0230417b2018    bl.ar|pooa||| 00| 0 eng |  aBR-BrBNAbeng  aH60  aDias, R.C.  aSantos, M.V.  aFerreira, E.A.  aBraz, T.G.S.  aFigueiredo, L.V.  aCruz, P.J.R.  aSilva, L.D.  aPhytosociology in degraded and renewed pastures in agrosilvopastoral systems  aPublicação on-line; 28 ref.; 8 tables; 1 illus.; Summaries (En, Pt)  a

ABSTRACT - In pastures, the incidence of weeds reduces the productivity and
quality of forage. The identification of the weed species in pastures is fundamental
to choose the renewal method. Thus, the objective of this work was to perform
phytosociology before and after the renewal of a Brachiaria decumbens pasture,
with the implantation of agrosilvopastoral systems. Eighteen different crop
arrangements for pasture renewal were evaluated. The renewal systems were by
eucalyptus integration (at 12 x 2 m or 12 x 3 m spacings) with maize, Brachiaria
brizantha cv. Marandu (palisade grass) and/or Macrotyloma axillare (perennial
horsegram), or monoculture and intercropping of palisade grass and perennial
horsegram, as well as the evaluation of the application or not of the herbicide
bentazon, at the recommended dose for maize crops (0.72 kg ha-1). Relative frequency,
relative density, relative abundance, relative dominance, coverage value index,
importance value index, dry matter and similarity index were evaluated. In the first
survey, before the pasture renewal, 23 plant species were identified. After the
implantation of agrosilvopastoral systems, the species Sida cordifolia, Lantana
camara and B. decumbens were the only occurring ones before and after the renewal
of the pasture with agrosilvopastoral systems. The use of palisade grass and the
application of the herbicide were efficient in controlling weeds. In systems that
contained palisade grass and perennial horsegram, the latter was not found in the
survey conducted one year after the implantation.

Keywords: intercropping, crop-livestock-forest, weed, pasture management.  a

RESUMO - Nas pastagens, a incidência de plantas daninhas reduz a produtividade
e qualidade da forrageira. A identificação das espécies infestantes em pastagens é
fundamental para a escolha do método de renovação. Assim, objetivou-se com este
trabalho realizar a fitossociologia antes e após a renovação da pastagem de
Brachiaria decumbens com a implantação de sistemas agrossilvipastoris. Foram
avaliados 18 diferentes arranjos de cultivo para renovação da pastagem. Os
sistemas de renovação foram por integração de eucalipto (nos espaçamentos de
12 x 2 ou 12 x 3 m) com milho, Brachiaria brizantha cv. Marandu (capim-marandu)
e/ou Macrotyloma axillare (java), ou monocultivo e consórcio de capim-marandu
e java, além da avaliação da aplicação ou não do herbicida bentazon na dose
recomendada para a cultura do milho (0,72 kg ha-1). Foram avaliados frequência
relativa, densidade relativa, abundância relativa, dominância relativa, índice de
valor de cobertura, índice de valor de importância, massa seca e índice de
similaridade. No primeiro levantamento, antes da renovação da pastagem, foram
identificadas 23 espécies de plantas. Após a implantação dos sistemas
agrossilvipastoris, as espécies Sida cordifolia, Lantana camara e B. decumbens
foram as únicas incidentes nos levantamentos antes e após a renovação da pastagem com sistemas
agrossilvipastoris. A utilização do capim-marandu e aplicação do herbicida foram eficientes no controle
das plantas daninhas. Nos sistemas que continham capim-marundu e java, está última não foi encontrada
no levantamento realizado um ano após a implantação.

Palavras-chave: consórcio, lavoura-pecuária-floresta, planta daninha, manejo de pastagem.  aERVA DANINHA  aLAVOURA  aPECUÁRIA  aFLORESTA  aPASTAGEM0 0886dLondrina-PR : Sociedade Brasileira da Ciência das Plantas Daninhas, 1978o2023-031022tPlanta Daninha (Brazil)x0100-8358; 1806-9681 (on-line)gv. 36 p. 1-15; (2018)wBR2023000074  uhttps://www.scielo.br/j/pd/a/BRQLjKwshtx9Q7pxqNv3KcP/?format=pdf&lang=en