potencial competitivo de cultivares de soja em relação às plantas daninhas competitive potential of soybean cultivars against weeds

Clicks: 260
ID: 185295
2005
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Ranked #61 of 96 articles by views in anti-cancer agents in medicinal chemistry

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Abstract
A utilização de métodos culturais no manejo de plantas daninhas é sempre importante dentro de sistemas agrícolas conservacionistas e que visam uma menor quantidade de herbicidas no ambiente. A escolha de cultivares mais competitivos com as espécies infestantes é mais uma ferramenta dentro do manejo integrado de plantas daninhas em lavouras de soja, bem como em outras culturas. Com o objetivo de avaliar o potencial competitivo de cultivares de soja difundidos no sudoeste de Goiás, em relação às plantas daninhas, visando recomendá-los para cultivo em áreas com histórico de alta densidade de espécies infestantes, foram conduzidos dois experimentos a campo em Rio Verde, GO, sendo avaliados quatro cultivares de soja de ciclo precoce no experimento 1: Monsoy 6101, Monsoy 8001, Emgopa 316 e Coodetec 204; e quatro de ciclo médio no experimento 2: Conquista, Codetec 211, Emgopa 315 e Vencedora. Também foram avaliados dois tipos de manejo de plantas daninhas: área capinada manualmente (sem plantas daninhas) e área não-capinada (com infestação de plantas daninhas). Aos 16, 25 e 46 dias após a semeadura (DAS), avaliaram-se a altura média e a biomassa seca de plantas; aos 63 DAS, a porcentagem de cobertura do solo pelos cultivares de soja; e, ao final do ciclo, o rendimento de grãos. Todos os cultivares de soja, de ciclo precoce ou médio, exibiram queda no rendimento de grãos com o nãocontrole das plantas daninhas. Emgopa 316 e Coodetec 204 mostraram ser mais competitivos, entre os de ciclo precoce, no controle de plantas daninhas. O mesmo aconteceu com o cultivar Emgopa 315, entre os de ciclo médio. Estes últimos são os mais indicados para serem cultivados em áreas com maior incidência de plantas daninhas.
The use of cultural methods in conservationist agricultural system is important for weed management, since it decreases the amount of the chemical products applied. The use of more competitive cultivars seems to be one of the most important weed management methods, which valid for soybean as well as other crops. Two field experiments were carried out to evaluate the competitive potential of soybean varieties, among those officially recommended for southwestern Goiás, against weeds in Rio Verde,GO aiming to propose the cultivation of better-quality varieties in areas with high weed pressure. Four short-season soybean varieties were evaluated in experiment 1: (Monsoy 6101, Monsoy 8001, Emgopa 316 and Coodetec 204) and four medium-season soybean varieties in experiment 2 (Conquista, Coodetec 211, Emgopa 315 and Vencedora). All the cultivars were evaluated under both weed management systems, i.e., manual weed control (absence of weeds) and no weed control (presence of weeds). At the 16th, 25th and 46th days after sowing (DAS), both plant height and plant dry matter were evaluated; at the 63rd DAS, the percentage of soil covered by the soybean cultivars was evaluated and at the end of the plant season, yield was evaluated. All the cultivars displayed yield reduction in the system with no weed control. However, Emgopa 316 and Coodetec 204 were found to be the most competitive among the short-season cultivars. Among the medium-season cultivars, Emgopa 315 showed the same tendency. Therefore, these two varieties are the most recommended to be cultivated in areas with high weed pressure.
Reference Key
pires2005plantapotencial Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;F.R. Pires;C.C.E. Menezes;S.O. Procópio;A.L.L. Barroso;J.F.S. Menezes;L.M. Leonardo;J.P.G. Souza;A.B. Vieira;J.F. Zanatta
Journal anti-cancer agents in medicinal chemistry
Year 2005
DOI
10.1590/S0100-83582005000400003
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582005000400003
Keywords
weeds glycine max

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