African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6858

Full Length Research Paper

Effects of plant densities on the performance of common bean varieties in multiple environments of northwestern Tanzania

Raya Amara
  • Raya Amara
  • Tanzania Agricultural Research Institute (TARI), Maruku Agricultural Research Centre, P. O. Box 127, Bukoba, Tanzania.
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Joseph Kimisha
  • Joseph Kimisha
  • Tanzania Agricultural Research Institute (TARI), Maruku Agricultural Research Centre, P. O. Box 127, Bukoba, Tanzania.
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Julius Mbiu
  • Julius Mbiu
  • Tanzania Agricultural Research Institute (TARI), Maruku Agricultural Research Centre, P. O. Box 127, Bukoba, Tanzania.
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Teshale Assefa
  • Teshale Assefa
  • Pan African Bean Research Alliance (PABRA) and Alliance of Bioversity International and CIAT, Africa-Hub, P. O. Box 2704, Arusha, Tanzania.
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Boaz Waswa
  • Boaz Waswa
  • Pan African Bean Research Alliance (PABRA) and Alliance of Bioversity International and CIAT, Africa-Hub, P. O. Box 823-00621, Nairobi, Kenya.
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  •  Received: 22 September 2022
  •  Accepted: 18 January 2023
  •  Published: 31 March 2023

Abstract

A study was carried out at two sites in Tanzania to assess the effect of different planting densities on growth and yield of five recently released bush bean varieties. The experiment was laid out in a split-plot design in a factorial arrangement with three replications during long and short rainy seasons of 2019/20 and 2020/21. The treatments comprised five bean varieties; TARIBEAN 1, 2, 3, 4 and 5 and five plant population densities; 200000, 222222, 250000, 266666 and 333333 plants/ha. Variables evaluated were plant height, angular leaf spot and common bacterial blight disease scores in leaves, number of pods per plant, number of seeds per pod, hundred seed weight and grain yield. The variables were subjected to ANOVA and means of statistically significant variables to plant density, variety, and environment were analyzed by Tukey HSD test and “which-won-where” view of the GGE biplot. The interaction of factors only affected significantly plant height and yield. Highest grain yield of 1,353 and 1,607 kg/ha were recorded by plant density of 200,000 plants/ha and TARIBEAN 1 variety at Maruku site during short rainy seasons (E2). Therefore, a plant density of 200,000 plants/ha and TARIBEAN 1 variety are recommended in all four environments.

Key words: Plant density, bean varieties, grain yield, environment, GGE biplot, “which-won-where”.