Response of Yield and Yield Components, Oil and Protein of rapeseed (Brassica napus L.) Cultivars to Planting Dates under Weed Competition Conditions

Document Type : Research Paper

Authors

1 University of Guilan, Rasht, Iran

2 Dept. of Agronomy and Plant Breeding, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran

3 Rice Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran.

4 Tea Research Center, Horticultural Science Research Institute (HSRI), AREEO, Lahijan, Iran.

10.22034/saps.2024.64122.3301

Abstract

Background & Objectives: The aim of research is to investigate and compare the effects of different planting dates on the competitive ability of rapeseed cultivars against weeds, and to identify the best cultivar for expanding the cultivation area of rapeseed in the temperate and humid climate of Guilan.
 
Materials and Methods: The experiment was carried out during two years (2021 to 2023) in Amlesh. In split plot factorial experiment, two weed interference conditions (full competition under natural weed community and weed free) were considered as main plots and four varieties of canola (RGS003, Delgan, Drago and Hayola4815) and three planting dates (6th of October, 26th of October and 15th of Novamber) as factorial arrangement in sub plots.
 
Results: The results of variance analysis showed a significant effect of weed, cultivar and planting date on seed yield, biological yield, number of pods per plant, and oil yield. The average comparison results showed that weed interference caused a decrease in seed yield by 10% (from 2631 kg.ha-1 to 2364 kg.ha-1) regardless of cultivar. The cultivar type and planting date had a significant effect on the biomass and density of weeds. Delgan and Drago cultivars had the highest seed yield in each weed interference conditions with average of 2650 and 2590 kg/ha. The effect of planting date on the reduction of seed yield in rapeseed cultivars was greater than that of weed interference. Weed-free treatments were significantly different from weedy treatments in terms number of silique per plant, number of seeds per silique, seed yield, biological yield, oil yield and protein yield.
Conclusion: The Delgan cultivar had higher seed and oil yield than other treatments in both weed interference conditions on the planting date of 26 October, which suggests that this cultivar can be used to produce adequate rapeseed yield in Guilan.

Keywords

Main Subjects

References

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Journal of Agricultural Science and Sustainable Production
Volume 36, Issue 1
2026
Pages 243-256

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