COWPEA TOLERANCE TO OXADIAZON

Authors

  • José Roberto Antoniol Fontes Embrapa Amazônia Ocidental
  • José Ricardo Pupo Gonçalves Embrapa Amazônia Ocidental
  • Ronaldo Ribeiro de Morais Embrapa Amazônia Ocidental

Keywords:

Vigna unguiculata, chemical weed control, floristic inventory

Abstract

The use of herbicides for weed control in cowpea [Vigna unguiculata (L.) Walp.] can result in highly effective control and lower production costs, if compared to mechanical control, especially weeding. However, not many studies were conducted in order to evaluate crop tolerance to herbicides. The objectives of this study were to evaluate cowpea tolerance, BRS Guariba cultivar, to the oxadiazon herbicide, applied in pre-emergence, at 200 g, 400 g, 600 g, 800 g, and 1,000 g of active ingredient (a.i.) ha-1, and weed control effectiveness. The weeds identified were Cleome affinis, Commenlina benghalensis, Cyperus rotundus, and Euphorbia heterophylla. The cultivar BRS Guariba was very tolerant to all doses tested, and the weed control level was good. Grain yields obtained with doses above 600 g a.i. ha-1 were excellent, comparable to weeding performance during the critical period of weed competition, between 20 and 40 days after seedling emergence (1,561 kg ha-1). The negative interference of weeds, throughout the cowpea life cycle, decreased yield by 59%.

KEY-WORDS: Vigna unguiculata; chemical weed control; floristic inventory.

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Author Biographies

José Roberto Antoniol Fontes, Embrapa Amazônia Ocidental

Engenheiro Agrônomo, Doutor em Ciências pelo Departamento de Fitotecnia da Universidade Federal de Viçosa, na área de Manejo Integrado de Plantas Daninhas. Pesquisador da Embrapa, lotado na Embrapa Amazônia Ocidental, em Manaus-AM, onde desenvolve trabalhos de pesquisa nas áreas de Manejo Integrado de Plantas Daninhas e Cultivo da Seringueira.

José Ricardo Pupo Gonçalves, Embrapa Amazônia Ocidental

Engenheiro Agrônomo, Doutor em Agricultura pelo Departamento de Ciências Agronômicas da Universidade Estadual Paulista, Campus de Botucatu. Pesquisador da Embrapa, lotado na Embrapa Amazônia Ocidental, em Manaus-AM, onde desenvolve trabalhos de pesquisa na área de Manejo de Culturas Alimentares - Arroz, Feijão-Caupi e Milho.

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Published

2010-03-17

How to Cite

FONTES, J. R. A.; GONÇALVES, J. R. P.; MORAIS, R. R. de. COWPEA TOLERANCE TO OXADIAZON. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 40, n. 1, p. 110–115, 2010. Disponível em: https://revistas.ufg.br/pat/article/view/6241. Acesso em: 16 aug. 2024.

Issue

v. 40, n. 1, Jan./Mar. 2010

Section

Plant Protection

License

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