Produção e partição de matéria seca de cultivares de feijão em competição com plantas daninhas

Autor: E.C.M. Byrro, J.P. Cury, Evander Alves Ferreira, Felipe Paolinelli de Carvalho, R.R. Braga, José Barbosa dos Santos, D Valadão Silva
Přispěvatelé: Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM)
Rok vydání: 2011
Předmět:
Zdroj: SciELO
Repositório Institucional da UFVJM
Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM)
instacron:UFVJM
ISSN: 0100-8358
DOI: 10.1590/s0100-83582011000100017
Popis: Submitted by repositorio ufvjm (repositorio@ufvjm.edu.br) on 2017-01-23T11:35:35Z No. of bitstreams: 2 S0100-83582011000100017.pdf: 1426602 bytes, checksum: d80e7cabdc6d71ba26a5de38dc87b216 (MD5) license.txt: 2109 bytes, checksum: aa477231e840f304454a16eb85a9235f (MD5) Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2017-01-24T18:31:49Z (GMT) No. of bitstreams: 1 S0100-83582011000100017.pdf: 1426602 bytes, checksum: d80e7cabdc6d71ba26a5de38dc87b216 (MD5) Made available in DSpace on 2017-01-24T18:31:49Z (GMT). No. of bitstreams: 1 S0100-83582011000100017.pdf: 1426602 bytes, checksum: d80e7cabdc6d71ba26a5de38dc87b216 (MD5) Previous issue date: 2011-03-01 Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG) Empresa de Pesquisa Agropecu?ria de Minas Gerais (EPAMIG) Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) Objetivou-se com este trabalho avaliar os efeitos da competi??o entre tr?s cultivares de feij?o e seis esp?cies de plantas daninhas no crescimento inicial e na aloca??o de mat?ria seca pelas plantas. Adotou-se arranjo fatorial em esquema 3 x 6 + 9, constitu?do pela combina??o de tr?s gen?tipos de feij?o (IPR Colibri, IPR Eldorado e P?rola) em competi??o com seis esp?cies de plantas daninhas (Euphorbia heterophylla, Bidens pilosa, Cenchrus echinatus, Amaranthus spinosus, Commelina benghalensis e Brachiaria plantaginea), al?m de nove tratamentos adicionais, correspondentes aos cultivares de feij?o e ?s esp?cies daninhas ausentes de competi??o. O delineamento foi em blocos casualizados com quatro repeti??es, e cada vaso contendo 5 L de substrato representou uma unidade experimental. O per?odo de conviv?ncia entre os cultivares de feij?o e as plantas daninhas foi de 45 dias ap?s emerg?ncia da cultura; depois disso, coletou-se o material vegetal para avalia??o da mat?ria seca e distribui??o entre os diferentes ?rg?os (ra?zes, folhas e caule). Os cultivares de feij?o apresentaram menor ac?mulo de mat?ria seca quando estavam em competi??o com as esp?cies de plantas daninhas. A raiz foi o principal ?rg?o afetado negativamente pela competi??o. De forma contr?ria, as folhas e o caule das esp?cies daninhas foram os ?rg?os mais prejudicados. De maneira geral, o cultivar P?rola foi o gen?tipo que mais tolerou a competi??o com plantas daninhas, e E. heterophylla foi a esp?cie daninha menos competitiva. A. spinosus e B. plantaginea foram as esp?cies com maior capacidade de competi??o com a cultura do feij?o. This study aimed to determine the competitive ability of three bean cultivars and six weed species and to quantify the effect of competition on the plants' growth and dry mass allocation. A factorial scheme 3 x 6 + 9 was adopted, consisting of a combination of three genotypes (Colibri IPR, IPR Eldorado, Pearl) in competition with six species of weeds (Euphorbia heterophylla, Bidens pilosa, Cenchrus echinatus, Amaranthus spinosus, Commelina benghalensis and Brachiaria plantaginea), plus nine additional treatments corresponding to the bean cultivars and weeds without competition. Both treatments were arranged in a randomized block design with four replicates, with each pot (containing 5 dm? soil) representing an experimental unit. The period of coexistence between the bean cultivars and weeds was 45 days after emergence, followed by collection of the plant material to assess the dry mass distribution among the different organs (roots, leaves and stems). The bean cultivars had a lower biomass accumulation when in competition with the weed species. The root was the main organ affected negatively. Conversely, the leaves and the stems of the competing species, in general, were the most affected. Overall, the cultivar Pearl was the genotype most tolerant to weed competition and E. heterophylla was the least competitive weed. A. spinosus and B. plantaginea were found to have a greater capacity to compete with the bean crop.
Databáze: OpenAIRE
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