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

Growing degree-day sum and crop growth cycle duration for wheat cultivars at different sowing dates

Lorena Maia Noreto
  • Lorena Maia Noreto
  • Universidade Estadual do Oeste do Paraná/CCA/PPGA, Rua Pernambuco, 1777, CEP 85960-000, Marechal Cândido Rondon, Paraná, Brazil.
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Élcio Silvério Klosowski
  • Élcio Silvério Klosowski
  • Universidade Estadual do Oeste do Paraná/CCA/PPGA, Rua Pernambuco, 1777, CEP 85960-000, Marechal Cândido Rondon, Paraná, Brazil.
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Claudio Yuji Tsutsumi
  • Claudio Yuji Tsutsumi
  • Universidade Estadual do Oeste do Paraná/CCA/PPGA, Rua Pernambuco, 1777, CEP 85960-000, Marechal Cândido Rondon, Paraná, Brazil.
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Antonio Carlos Torres da Costa
  • Antonio Carlos Torres da Costa
  • Universidade Estadual do Oeste do Paraná/CCA/PPGA, Rua Pernambuco, 1777, CEP 85960-000, Marechal Cândido Rondon, Paraná, Brazil.
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Francisco de Assis Franco
  • Francisco de Assis Franco
  • Cooperativa Central de Pesquisa Agrícola (COODETEC), BR 467 ? Km 98, CEP 85813-450, Cascavel, Paraná, Brazil.
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  •  Received: 13 August 2013
  •  Accepted: 17 December 2014
  •  Published: 15 January 2015

Abstract

The wheat Triticum aestivum L. is one of the most important foods in the human diet due to its high nutritional value. The grains can be eaten as bread, noodles, pasta, cookies, among others. The cultivation of wheat in Brazil has high production potential; the southern is region responsible for the largest acreage in the country, due to its soil and climate more favorable for crop development. The objective of this study was to determine the growing degree-days sum and the relationship between the period length from sowing to physiological maturity and sowing dates of thirteen wheat cultivars. The data on wheat crop correspond to the harvests of 2007 to 2011. The treatments consisted of 13 wheat cultivars and 3 sowing dates. The data used for the analysis were: Total elapsed days from sowing to silking, to physiological maturity, and of the silking to physiological maturity, along with the growing degree-days sum for these periods, beyond grains yield and hectoliter weight. The results indicate that the average length of sowing to the silking was 71 days. For the period from silking to physiological maturity the average length was 54 days. The increase in length of time from sowing to the silking in cultivars sown in May 25th was due to the decrease in air temperature. The average of growing degree-days sum between the period from sowing to physiological maturity was 1487. The cultivars that stood out presenting a shorter period of silking to physiological maturity and high productivity were the cultivars CD 114, CD 120, CD 121, CD 122, CD 124 and Onix.

 

Key words: Triticum aestivum L., thermal summation, vegetative development.