Effect of long-term agricultural management systems on occurrence and composition of weed species

Concenço, Germani; Salton, J. C.; Secretti, Mateus Luiz; Mendes, P.B; Brevilieri, R. C.; Galon, Leandro

doi:10.1590/s0100-83582011000300005

Cited by 9 publications

(4 citation statements)

References 11 publications

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“…Other species of minor importance in agronomic terms occurred at lower frequencies, as follows: Cenchrus echinatus, Sonchus oleraceus, Ipomoea grandifolia, Brachiaria plantaginea and Portulaca oleracea. We observed a predominance of large-leaved species, and according to Concenço et al (2011), large-leaved weeds are predominant in no-tillage areas, probably due to selection factors linked to the herbicides commonly used.…”

Section: Resultsmentioning

confidence: 72%

Weed dynamics in grain sorghum-grass intercropped systems

Filho¹,

Marchão²,

Carvalho³

et al. 2014

Rev. Ciênc. Agron.

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The aim of this study was to assess the influence of short-season sorghum-grass intercropped systems on weed population dynamics. The integrated systems consisted of sorghum grown at two row spacings (0.50 m and 0.70 m), intercropped with palisade grass or Congo grass. We also used sole crops of sorghum, palisade grass, Congo grass and a fallow to serve as a reference for spontaneous vegetation. The experiment was conducted in 2010 and 2011 at Planaltina (Federal District) in Brazil. Weed populations and weed dry matter were assessed during the short season and during the succession soybean cycle. The weed soil seed bank was sampled in both years of the study. Sorghum at a row spacing of 0.50 m intercropped with Congo grass reduced the Ageratum conyzoides population. The Tridax procumbens seed bank in the soil was reduced by using sorghum at a the row spacing of 0.70 m, whether intercropped or not. Planting palisade grass during the short season reduced Digitaria sanguinalis in the soil seed bank. Planting palisade grass or Congo grass as a sole crop or intercropped reduced the number of weed seeds in the soil, showing that these species can be recommended for integrated weed management in intercropped systems.

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Section: Resultsmentioning

confidence: 72%

Weed dynamics in grain sorghum-grass intercropped systems

Filho¹,

Marchão²,

Carvalho³

et al. 2014

Rev. Ciênc. Agron.

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“…This indicates similarity between the weed communities in the municipalities evaluated (Table 5), possibly due to the similarity of cultivation practices between the zones, such as low crop rotation and intensification of sowing. Concenço et al [30] indicate that areas where a crop is grown continuously or without rotation for a long period of time, there will be no disconnection or dissimilarity in the weed communities. Ramírez et al [27] indicate that the Jaccard index varies according to climatic conditions and agronomic management.…”

Section: Resultsmentioning

confidence: 99%

Phytosociological study of weeds associated with carrot crops in two municipalities of Boyacá

Córdoba-Patiño

Pinzón-Sandoval

2022

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With the purpose of knowing the phytosocilogy of weeds associated to a carrot crop (Daucus carota L.) under conditions of the municipalities of Ventaquemada and Jenesano-Boyacá, one lot per municipality destined to carrot cultivation was selected and a W-shaped layout was made covering an area of 500 m2. Relative density, relative frequency, relative dominance and the importance value index (IVI) were calculated, as well as the Alpha and Beta diversity indices for the sampled areas. A total of 6 families and 11 species were counted, of which 63.64% were represented by annual plants and 36.36% by perennial plants. The class Liliopsida (Monocotyledon) was represented by the Poaceae family. The Magnoliopsida class (Dicotyledon) was represented by the following families: Asteraceae, Brassicaceae, Boraginaceae, Leguminosaceae, Polygonaceae, the last one being the one with the highest number of species. The species R. crispus and P. nepalense were the ones with the highest values of Importance Value Index (IVI) with 0.953 and 0.959, respectively. According to the Shannon-Wiener diversity and Simpson’s dominance indices, the evaluated areas presented a low species diversity and a high probability of dominant species. The results obtained can serve as a basis and tool for carrot growers in the evaluated areas to define management plans for the associated weeds and thus optimize yields in this crop.

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“…Concenço et al (2011b) report that proper management in agricultural cropping systems allows formation of a larger and more diverse weed seed bank in the soil, increasing the number of species present and reducing the occurrence of most weed species. Areas with crop rotation in the interrows of Jatropha caused a reduction, for example, in the occurrence of the most common weed species observed in the area: S. grisebachii.…”

Section: Resultsmentioning

confidence: 99%

Occurrence of weed species in Jatropha curcas intercropping systems

et al. 2014

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-This study aimed to evaluate the level of infestation by weed species in a consolidated Jatropha plantation, as a function of the plant species grown in interrows. The experiment was installed in 2006 at the district of Itahum, city of Dourados, state of Mato Grosso do Sul, Brazil, made possible through a partnership between Embrapa Western Agriculture and Paraiso Farm. Treatments consisted of (1) Jatropha in monocrop, with no plant at the interrrows; or the following plants cultivaded at the interrows of Jatropha: (2) Stylosanthes spp.; (3) Brachiaria ruziziensis; (4) Brachiaria ruziziensis + Stylosanthess pp.; (5) Brachiaria humidicola; (6) Panicum maximum cv. massai; (7) Cajanus cajan cv. anão; (8) Crotalaria spectabilis; (9) Crop rotation system 1 -(maize second crop -Crambe abyssinica -soybeanpeanut); and (10) Crop rotation system 2 -(cowpea -radish -maize -cowpea) conducted for two years. Phytosociological characterization of weed species was accomplished in 2011 based on the Ecological Approach. Estimations of relative abundance, frequency, dominance and Importance Value Index were obtained. Areas were also characterized by the diversity coefficients of Simpson and modified Shannon-Weiner, and then grouped by cluster analysis. Areas with low soil coverage resulted in higher infestation levels; crop rotation in the interrows of Jatropha produced a significant reduction in weed infestation, but the lowest infestation levels were observed when grasses were grown intercropped with Jatropha. Lower diversity coefficients were associated with occurrence of the most troublesome weed species. In the first years after planting Jatropha, species of Brachiaria or a crop rotation involving species with high mulching ability and whose biomass exhibit a high C:N ratio, should be established in the interrows to avoid problems with weeds infestation.Keywords: Jatropha crop, infestation, phytosociology. Palavras-chave: pinhão-manso, infestação, fitossociologia. RESUMO: Objetivou-se com este estudo avaliar o nível de infestação por plantas daninhas em uma plantação consolidada de pinhão-manso em função da espécie cultivada nas entrelinhas da cultura. O experimento foi instalado em 2006 no distrito de Itahum, cidade de Dourados, Estado de Mato Grosso do Sul, tendo sido viabilizado por uma parceria entre a Fazenda Paraíso e a Embrapa Agropecuária Oeste. Os tratamentos consistiram do cultivo solteiro (1) ou das seguintes espécies cultivadas nas entrelinhas da cultura: (2) Stylosanthes spp.; (3) Brachiaria ruziziensis; (4)Brachiaria

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Effect of long-term agricultural management systems on occurrence and composition of weed species

Cited by 9 publications

References 11 publications

Weed dynamics in grain sorghum-grass intercropped systems

Weed dynamics in grain sorghum-grass intercropped systems

Phytosociological study of weeds associated with carrot crops in two municipalities of Boyacá

Occurrence of weed species in Jatropha curcas intercropping systems

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