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      Supressão de plantas daninhas por leguminosas anuais em sistema agroecológico na Pré-Amazônia Translated title: Suppression of weeds by annual leguminous plants under Amazon agroecological system

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          Abstract

          Este trabalho teve por objetivos identificar e avaliar a agressividade potencial das plantas daninhas em um agrossistema com leguminosas herbáceas anuais como cobertura de solo. Foram plantadas, nas ruas de um sistema de aléias de sombreiro (Clitoria fairchildiana) e no final do período agrícola, as leguminosas mucuna-preta, feijão-guandu, feijão-de-porco e calopogônio, em sistema de blocos ao acaso com cinco repetições. Para estudo da dinâmica da composição florística, avaliaram-se a freqüência, densidade, dominância, similaridade, diversidade de espécies e biomassa das plantas daninhas. Foram identificadas 42 espécies de plantas espontâneas, das quais as mais freqüentes e de maior densidade e dominância foram Leptochoa virgata, Panicum laxum e Sida sp. Não foram detectadas diferenças significativas para densidade, número de espécies, diversidade e biomassa entre as plantas daninhas emergidas nos quatro tratamentos com leguminosas; nem destas em relação ao controle.

          Translated abstract

          This study evaluated the efficiency of cover legumes in suppressing weed. A field experiment was arranged in a randomized block design with five replications in an alley cropping system, using Clitoria fairchildiana and four cover species, Mucuna aterrima, Cajanus cajan, Canavalia ensiformes and Calopogonium mucunoides. Weed frequency, density, diversity and biomass were evaluated with 42 weed species being identified. The most frequent and presenting the highest density and dominance were Leptochoa virgata, Panicum laxum and Sida sp. No significant differences were detected in density, number of species, diversity and biomass among the four legumes, nor between them and the control.

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          Ecologia

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            Fundamentos em ecologia

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              Comparison of soil N availability and leaching potential, crop yields and weeds in organic, low-input and conventional farming systems in northern California

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                pd
                Planta Daninha
                Planta daninha
                Sociedade Brasileira da Ciência das Plantas Daninhas (Viçosa )
                1806-9681
                2007
                : 25
                : 2
                : 267-275
                Affiliations
                [1 ] Universidade Estadual do Maranhão Brazil
                Article
                S0100-83582007000200005
                10.1590/S0100-83582007000200005
                fbdfd063-072b-430b-87ef-a2bb6e5b813f

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0100-8358&lng=en
                Categories
                PLANT SCIENCES

                Plant science & Botany
                alley cropping,cover crop,population dynamics,sistema em aléias,cultura de cobertura,dinâmica populacional

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