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MACIEL, Cleber Daniel de Goes et al. Weeds phytosociological survey in organic coffee crop. Bragantia [online]. 2010, vol.69, n.3, pp.631-636. ISSN 0006-8705.

Adjust of one coffee crop to organic system causes significative changes in weed management system, but information about the weed community in areas cultivated with organic coffee crop are scarce in Brazil. This work aimed to perform a phytosociological survey of weed community in three coffee crop areas (Mundo Novo, Bourbon Vermelho and Obatã genotypes) conducted in organic system, in Garça County, São Paulo State. In the three analyzed areas, a hundred of metallic drained squares were randomized hurled with useful area of 0.25 m2 between crop lines. Plants contained in the interior of squares were identified according to botanic species, common name and its family. Phytosociological parameters were determined: frequency, density, abundance, relative frequency, relative density, relative abundance, index of importance value, and floristic similarity by Simple Matching of Sneath & Sokal and similarity by Sorensen method. Outstanding families, with major species number in the three studied areas were Poaceae and Asteraceae. There was high similarity in all studied contrasts, since at least a half of identified species was common to the two contrasted areas.

Keywords : phytosociology; Coffea arabica; cultivars; organic agriculture.

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