The effect of water stress and plant density on yield and some physiologic traits of spotted bean (Phaseolus vulgaris L.), cultivar Talash in Yasouj region

Abstract

In order to investigate the effect of water stress and plant density on yield and some physiologic traits of spotted bean (Phaseolus vulgaris L.), cultivar Talash, an experiment was carried out as split plots layout in randomized complete blocks with three replications in Yasouj, in 2012. Factors of the test including irrigation in three levels; without stress (control treatment), water stress in vegetative stage (interrupting the irrigation at the opening stage of the third to fourth true leaf), and water stress at reproductive stage (interrupting the irrigation at the stage of 50% flowering) as the main factors and four density level including 15, 25, 35 and 45 plants per m 2 were considered as sub-factors. The results showed that, the effect of water stress, plant density and interaction of water stress and plant density on biologic yield, grain yield, harvesting index and qualitative traits was significant. The maximum grain yield was observed in the control plot and density of 45 plants per m 2 by 2398 kg/ha, also the minimum yield was observed in the reproductive stress treatment and density of 25 plants per m 2 by 1629 kg/ha.

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“…Higher planting density promotes shoot positioned upward and leads to the elongation of stems and leaves to outcompete its neighbors for enough sunlight, ultimately accelerating the transition from a vegetative stage to a reproductive stage and triggering early flowering and maturation ( Warnasooriya and Brutnell, 2014 ). Additionally, higher cultivation density provides more sufficient leaf area to absorb sunlight efficiently or improve symbiotic nitrogen fixation by root nodules, thus benefiting early flowering or improving grain yield ( Abubaker, 2008 ; Makoi et al., 2009 ; Biosci et al., 2013 ; Rahmanet, 2019 ; Asemanrafat and Honar, 2023 ) ( Table 7 ). In contrast, the greater availability of fertilizers per plant due to low plant density results in more vigorous vegetative growth and late flowering ( Abubaker, 2008 ).…”