Efficacy of Reduced Rates of Herbicide Integrated with Straw Mulch and Hand Weeding in Weed Management of Borage (Borago officinalis L.)

Document Type : Research Paper

Authors

1 MSc in Weed Science, Department of Plant Ecophysiology, Faculty of Agriculture, University of Tabriz, Iran,

2 Professor/Department of Plant Ecophysiology/Faculty of Agriculture/ University of Tabriz

3 Professor, Department of Plant Production & Genetics, Faculty of Agriculture, University of Zanjan, Iran

Abstract

Background and Objective: In integrated weed management of medicinal plants, the use of reduced rates of herbicides in integration with non-chemical methods such as straw mulching and hand weeding reduces the cost of herbicide application and environmental pollution. So, this experiment was conducted in order to evaluate the effect of integrated weed management methods on growth characteristics and yield of borage (Borago officinalis L.).
 
Material and Methods: The experiment was arranged as factorial based on randomized complete block design with three replications at the Research Farm of Medicinal Crops of University of Zanjan in 2016. The first factor was weed control treatment with 14 levels including pendimethalin (50% of recommended dose), trifluralin at 50 and 100 % of recommended dose alone and with wheat straw mulch and weed-infested treatment and the second factor was supplementary control (without and with one hand weeding 50 days after planting). Also, the weed free treatment was considered in the experiment.
 
Results: Results indicated that weed density and biomass and borage yield significantly affected by weed control treatment and hand weeding. The lowest weed biomass was observed in trifluralin 100% + mulch (99.5 g.m-2) that was not significantly different with trifluralin 100%. Application of soil applied herbicides reduced weed biomass but without hand weeding was unable to control weeds during growth season. Reduced rates of herbicides could be more effective if combined with hand weeding compared with their application alone. The highest borage yield loss observed in weed infested treatment that was not significantly different with pendimethalin (50% of recommended dose) and trifluralin at 100% of recommended dose alone.
 
Conclusion: Generally, the treatment of trifluralin 50% + one hand weeding had the highest borage flower yield (43.6 g.m-2) and reduction in weed biomass and this treatment could be introduced as sustainable weed management method in borage.
 

Keywords

Main Subjects

References

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JOURNAL OF AGRICULTURAL SCIENCE AND SUSTAINABLE PRODUCTION
Volume 35, Issue 1
April 2025
Pages 195-212

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