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

Productive and physiological performance of lettuce cultivars at different planting densities in the Brazilian Semi-arid region

Hozano de Souza Lemos Neto*
  • Hozano de Souza Lemos Neto*
  • Department of Fitotecnia, Federal University of Ceará (UFC), Brazil.
  • Google Scholar
Marcelo de Almeida Guimaraes
  • Marcelo de Almeida Guimaraes
  • Department of Fitotecnia, Federal University of Ceará (UFC), Brazil.
  • Google Scholar
Jean Paulo de Jesus Tello
  • Jean Paulo de Jesus Tello
  • Department of Fitotecnia, Federal University of Viçosa (UFV), Brazil.
  • Google Scholar
Rosilene Oliveira Mesquita
  • Rosilene Oliveira Mesquita
  • Department of Fitotecnia, Federal University of Ceará (UFC), Brazil.
  • Google Scholar
Julio Cesar do Vale
  • Julio Cesar do Vale
  • Department of Fitotecnia, Federal University of Ceará (UFC), Brazil.
  • Google Scholar
Benedito Pereira Lima Neto
  • Benedito Pereira Lima Neto
  • Department of Fitotecnia, Federal University of Ceará (UFC), Brazil.
  • Google Scholar


  •  Received: 16 November 2016
  •  Accepted: 14 February 2017
  •  Published: 09 March 2017

Abstract

In regions of high temperature, production and quality in the lettuce is reduced. This requires finding of cultivars that are more adapted to such conditions and adjust the planting density for each cultivar. Consequently, the aim of this study was to evaluate the productive and physiological performance of lettuce cultivars at different planting densities under semi-arid conditions. The experiment was carried out at the Horticulture Teaching Garden of the Federal University of Ceará in Fortaleza, in a randomised block design with four replications, with the treatments arranged in a 4 × 4 factorial scheme. The first factor consisted of four lettuce cultivars (Red Salad Bowl, Salad Bowl Green, Mimosa Green Salad Bowl and Crespa Lollo Bionda) and the second factor of four planting densities (0.20 × 0.20 m, 0.25 × 0.25 m, 0.20 × 0.25 m 0.25 × 0.30 m between plants and rows). The characteristics of the lettuce such as qualitative (age at bolting and flowering, and state of health - pests and diseases), quantitative (plant height and diameter, fresh and dry commercial weight, fresh and dry non-commercial weight, and total fresh and dry weight), and physiological (gas exchange) were evaluated. The Salad Bowl Green and Mimosa Green Salad Bowl cultivars displayed average tolerance to bolting (63 days after sowing, DAS) and late flowering (95 DAS). ‘Salad Bowl Green’ had the highest total fresh and dry weight. For density, greater individual plant production was seen at 0.25 × 0.30 m; greater productivity of commercial fresh weight and total fresh weight was seen at 0.20 × 0.20 m for all cultivars. ‘Salad Bowl Green’ is the most promising for cultivation under semi-arid conditions when grown at lower densities.

Key words: Lactuva sativa L., early bolting, productivity, dry weight, gas exchange.