African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6688

Full Length Research Paper

Morphoagronomic traits of BRS 610 sorghum submitted to artificial defoliation

Alan Mario Zuffo
  • Alan Mario Zuffo
  • Departament of Agriculture, Campus Universitario, UFLA, 37200-000, Lavras, MG, Brazil.
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Joacir Mario Zuffo Junior
  • Joacir Mario Zuffo Junior
  • Departament of Agriculture, Campus Universitario, UNEMAT, 78690-000, Nova Xavantina, MT, Brazil.
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Jodean Alves da Silva
  • Jodean Alves da Silva
  • Departament of Agriculture, Campus Universitario, UFLA, 37200-000, Lavras, MG, Brazil.
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Adaniel Sousa dos Santos
  • Adaniel Sousa dos Santos
  • Departament of Agriculture, Campus Universitario, UFPI, 64900-000, Bom Jesus, PI, Brazil.
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Joao Batista da Silva Oliveira
  • Joao Batista da Silva Oliveira
  • Departament of Agriculture, Campus Universitario, UFPI, 64900-000, Bom Jesus, PI, Brazil.
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Everton Vinicius Zambiazzi
  • Everton Vinicius Zambiazzi
  • Departament of Agriculture, Campus Universitario, UFLA, 37200-000, Lavras, MG, Brazil.
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Adriano Teodoro Bruzi
  • Adriano Teodoro Bruzi
  • Departament of Agriculture, Campus Universitario, UFLA, 37200-000, Lavras, MG, Brazil.
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Nelson Junior Dias Vilela
  • Nelson Junior Dias Vilela
  • Departament of Agriculture, Campus Universitario, UFLA, 37200-000, Lavras, MG, Brazil.
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Guilherme Leite Dias Vilela
  • Guilherme Leite Dias Vilela
  • Departament of Agriculture, Campus Universitario, UFLA, 37200-000, Lavras, MG, Brazil.
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Ana Carolina Goncalves Ferreira
  • Ana Carolina Goncalves Ferreira
  • Departament of Agriculture, Campus Universitario, UFLA, 37200-000, Lavras, MG, Brazil.
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  •  Received: 08 August 2015
  •  Accepted: 18 September 2015
  •  Published: 01 October 2015

Abstract

The objective of this study was to evaluate the agronomic traits of BRS 610 forage sorghum, based on developmental stages and defoliation levels. The experiment was conducted in a protected environment, located in União experimental farm, in Nova Xavantina-MT, in vases with 8 dm-3 capacity in soil classified as dystrophic red latosol. The experimental design was a randomized block, arranged in a 4 x 3 + 1 factorial, four stages of defoliation [three expanded leaves (15 days after emergence of plants - DAE), six expanded leaves (30 DAE), panicle differentiation (45 DAE), booting (60 DAE)] and three levels of defoliation [(33, 66 and 99%) and an additional treatment without defoliation], making the total of 13 treatments with three replications. BRS 610 sorghum crop was used. It was evaluated plant height, stem diameter, root dry mass and shoot dry mass. Except for plant height and stem diameter, for the other variables there were significant influences of defoliation levels. To root mass and shoot dry mass it was verified that less intense defoliation and the early stages affect less those variables. To root dry mass, reductions are evident up to 66.36% when the plants are submitted to total leaves removal at the stage of panicle differentiation. The production of shoot dry mass of the BRS 610 sorghum is affected when submitted to any level and defoliation stage.

 

Key words: Forage, silage, Sorghum bicolor (L.) Moench.