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The critical period of weed control in cotton in conventional and ultra-narrow row spacing condition

Document Type : Research Paper

Authors

1 Former M.Sc. Student, Department of Agronomy and Plant Breeding, Sabzevar Branch, Islamic Azad University, Sabzevar, Iran

2 Associate Professor, Department of Agronomy and Plant Breeding, Sabzevar Branch, Islamic Azad University, Sabzevar, Iran

3 Assistant Professor, Department of Agronomy and Plant Breeding, Sabzevar Branch, Islamic Azad University, Sabzevar, Iran

Abstract

To determination of critical time of weed control in Cotton (Gossypium hirsutum L.) (Khordad cultivar) in conventional and ultra-narrow row spacing conditions, a field experiment was arrange as a factorial arrangement in a randomized complete block design with three replications in Sabzevar in 2015. Factors were cultivation systems (conventional (70 Cm row spacing) and ultra narrow row (20 Cm row spacing) and duration of weed interference (0, 30, 45, 60, 7 days after emergence and weedy in full season. The results of the experiment showed that in ultra-narrow row condition, seed cotton yield losses of 2.5, 5 and 10 percent were estimated to occur on 27.4, 36.1 and 44.7 day after emergence, respectively and in conventional condition yield losses of 2.5, 5 and 10 percent were estimated to occur on 8.1, 13.5 and 24.4 day after emergence, respectively. The onset of seed cotton yield an lint yield loss was earlier (46.3 and 53.7 days after emergence, respectively) in conventional condition while in ultra-narrow row condition the onset of seed cotton yield and lint yield loss was postponed to 57.9 and 65.9 days after emergence, respectively, Overall, the results of the experiment showed that cultivation of cotton in ultra-narrow row spacing in weed interference conditions could provide a better seed cotton yield than conventional spacing.

Keywords

References
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Journal of Crops Improvement
Volume 21, Issue 3
September 2019
Pages 247-258
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