African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6578

Full Length Research Paper

Chemical ripeners and different harvest periods in sugarcane in State of Paraná, southern Brazil

Paulo Barbosa de Oliveira Filho
  • Paulo Barbosa de Oliveira Filho
  • Pós-Graduação em Agronomia – PPGA, Centro de Ciências Agrárias – CCA, Universidade Estadual do Oeste do Paraná – UNIOESTE, Campus de Marechal Cândido Rondon, Rua Pernambuco, n° 1777 - 85960-000 - Marechal Cândido Rondon, PR – Brasil.
  • Google Scholar
Jose Barbosa Duarte Junior
  • Jose Barbosa Duarte Junior
  • PPGA/CCA/UNIOESTE, Campus de Marechal Cândido Rondon. Rua Pernambuco, n° 1777 - 85960-000 - Marechal Cândido Rondon, PR – Brasil.
  • Google Scholar
Antonio Carlos Torres da Costa
  • Antonio Carlos Torres da Costa
  • PPGA/CCA/UNIOESTE, Campus de Marechal Cândido Rondon. Rua Pernambuco, n° 1777 - 85960-000 - Marechal Cândido Rondon, PR – Brasil.
  • Google Scholar
Paulo Sergio Rabello de Oliveira
  • Paulo Sergio Rabello de Oliveira
  • PPGA/CCA/UNIOESTE, Campus de Marechal Cândido Rondon. Rua Pernambuco, n° 1777 - 85960-000 - Marechal Cândido Rondon, PR – Brasil.
  • Google Scholar
Eurides Kuster Macedo Junior
  • Eurides Kuster Macedo Junior
  • PPGA/CCA/UNIOESTE, Campus de Marechal Cândido Rondon. Rua Pernambuco, n° 1777 - 85960-000 - Marechal Cândido Rondon, PR – Brasil.
  • Google Scholar
Vandeir Francisco Guimaraes
  • Vandeir Francisco Guimaraes
  • PPGA/CCA/UNIOESTE, Campus de Marechal Cândido Rondon. Rua Pernambuco, n° 1777 - 85960-000 - Marechal Cândido Rondon, PR – Brasil.
  • Google Scholar
Willian Bosquette
  • Willian Bosquette
  • Acadêmico do Curso de Agronomia, CCA/UNIOESTE, Marechal Cândido Rondon, PR – Brasil.
  • Google Scholar


  •  Received: 10 September 2014
  •  Accepted: 15 September 2016
  •  Published: 29 September 2016

Abstract

The objective of this work was to evaluate the effects of control action (natural ripening, without ripeners) and of glyphosate, paraquat, fluazi-p-butil, ethephon, etyl-trinexapac, sulfometuron methyl and KNO3 on the number of stalks per area, diameter of the median third of stalks and productivity (tons of canesstalks per hectare), and brix, pol of the sugarcane and extractable sugar. It was used a randomized block design with four replicates in a sub-split plots. KNO3 contributes to improve agronomic quality by increasing productivity of stalks and the most favorable harvest period to the variable was from 60 to 120 days after ripener application (DAA). Etyl-trinexapac, sulfometuron methyl and KNO3 increased technological variables and the most adequate harvest period for ratoon sugar cane was 120 days after application (DAA) of ripeners and control, because they provided gains for variables ATR, Brix and PC in comparison to the respective initial reference times.

 

Key words: Plant regulators, Saccharum spp., technological quality.