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O experimento foi conduzido na horta da Universidade Federal Rural do Semi-Arido (UFERSA), no periodo de setembro a dezembro de 2009, com o objetivo de realizar o levantamento fitossociologico nos seguintes tratamentos: sistema de monocultivo da cenoura ( Daucus carota ) e sistema de cultivo da cenoura consorciada com rabanete ( Raphanus sativus ). Para cada sistema de plantio foram realizadas 24 amostragens em quadrados vazados de 0,50 m de lado, onde as plantas daninhas foram coletadas e separadas por especie, para determinacao das seguintes caracteristicas: numero total de individuos por especie, numero total de parcelas que contem a especie, frequencia, frequencia relativa, densidade, densidade relativa, abundância, abundância relativa, massa seca, massa seca relativa, indice de valor de importância (IVI), e o indice de valor de importância incluindo a massa seca (IVI-MS). Foram identificadas 19 especies, distribuidas em 12 familias botânicas. A familia mais representativa foi a Poaceae, seguida por Portulacaceae, Cyperaceae, Tumeraceae, Euphorbiaceae, Malvaceae, Amaranthaceae, Rubiaceae, Fabaceae, Molluginaceae, Convolvulaceae e Asteraceae. As areas conduzidas no sistema de consorcio apresentaram reducao de 13,2% na massa seca pelas plantas daninhas, embora a densidade nao tenha sido alterada. A especie de planta daninha Portulaca oleracea se destacou em relacao as demais por ter acumulado 40,21 e 47,31% da massa seca produzidas infestantes em monocultivo e consorcio, respectivamente. Phyto-sociological survey of weed in carrot’s cultivation in monocrop and intercropped with radish Abstract: Was conducted the experiment in didact garden at the Rural Federal University of Semi-Arid, from September to December 2009, in order to carry out the phytosociological survey in the treatments: monocrop system of carrot ( Daucus carota ) and intercropping system of carrot with radish ( Raphanus sativus ). For each planting system were conducted 24 sampling on leaked squares of 0.50 m side, where the weeds were collected and separated by species, to determine the characteristics: total number of individuals per species, total number of parcels containing the species, frequency, relative frequency, density, relative density, abundance, relative abundance, dry matter, relative dry matter, importance value index (IVI), and importance value index including the dry matter (IVI-DM). 19 species were identified, distributed in 12 botany families. The Poaceae was the most representative family, followed in descending order of presence by Portulacaceae, Cyperaceae, Tumeraceae, Euphorbiaceae, Malvaceae, Amaranthaceae, Rubiaceae, Fabaceae, molluginaceae, Convolvulaceae and Asteraceae. In the areas conducted in intercropping system there was a decrease by 13.2% in dry matter of weeds, although its density remained constant. The specie, Portulaca oleracea, stands out over the others for having accumulated 40.21 and 47.31% of dry matter in monocrop and intercrop systems, respectively.

Levantamento fitossociológico de plantas daninhas na cultura da cenoura em monocultivo e consorciada com rabanete