Weed interference on off-season sorghum crop

Authors

  • Paulo Henrique Ramos Cabral Instituto Federal Goiano (IFG)
  • Adriano Jakelaitis Instituto Federal Goiano (IFG)
  • Isabella Sichierski Cardoso Instituto Federal Goiano (IFG)
  • Vinícius Tavares de Araújo Instituto Federal Goiano (IFG)
  • Evandro César Fernandes Pedrini Instituto Federal Goiano (IFG)

Keywords:

Sorghum bicolor L., Poaceae, weed community.

Abstract

Sorghum has a great importance in the world economy as an energy source for food and feed. In the southwest Goiás State, although this culture has a high productive potential, its yield is low, mainly due to the interference of inadequate weed management. This research aimed at determining the periods of weed interference on off-season sorghum crop, in Rio Verde, Goiás State, Brazil. Treatments consisted of ten periods of initial control, in which the crop was kept free of weeds, and ten periods of initial coexistence with weeds. Both the initial periods of control or coexistence, after the crop emergence, were: 0-0, 0-7, 0-14, 0-21, 0-28, 0-35, 0-42, 0-49, 0-56 and 0-harvest (112 days after emergence - DAE). The most important weed species present in the experimental area were Amaranthus lividus, Commelina benghalensis, Bidens pilosa, Sida rhombifolia, Urochloa decumbens, Digitaria horizontalis and Portulaca oleracea. The presence of weeds reduced plant height, stem diameter, grain yield and one thousand grain weight of sorghum, with a higher interference degree for increasing periods of mutual coexistence between the weed community and sorghum. For a 5% tolerance in the reduction of sorghum yield, it was concluded that the period before the interference was up to 23 DAE, the total period of interference prevention up to 42 DAE and the critical period of interference prevention from 23 to 42 DAE.

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Author Biography

Adriano Jakelaitis, Instituto Federal Goiano (IFG)

Possui graduação em Agronomia pela Universidade Federal de Viçosa (1997) e mestrado (2001), doutorado (2004) e pós-doutorado (2005) em Fitotecnia pela Universidade Federal de Viçosa. Atualmente é professor do Instituto Federal Goiano, Campus de Urutaí. Tem experiência na área de Ciência de Plantas Daninhas, atuando principalmente nas seguintes linhas de pesquisa: interação herbicida-ambiente, interferência entre plantas daninhas e cultivadas, manejo integrado de plantas daninhas, grandes culturas, plantio direto e integração agricultura pecuária.

Published

2013-10-07

How to Cite

CABRAL, P. H. R.; JAKELAITIS, A.; CARDOSO, I. S.; ARAÚJO, V. T. de; PEDRINI, E. C. F. Weed interference on off-season sorghum crop. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 43, n. 3, p. 308–314, 2013. Disponível em: https://revistas.ufg.br/pat/article/view/22966. Acesso em: 20 dec. 2024.

Issue

Section

Crop Science