Document Type : Research Paper
Authors
1
Department of agronomy, Faculty of Crop Sciences, Sari Agricultural Sciences and Natural Resources
2
ِDepartment of Agronomy, Faculty of Crop Sciences, Sari Agricultural Sciences and Natural Resources University, Iran
3
Department of of Agronomy, Faculty of Crop Sciences, Sari Agricultural Sciences and Natural Resources University, Iran
4
Research Assist. Prof., Dept. of Seed Improvement, Rice Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran
5
School of Agriculture and Environment, Massey University, New Zealand
Abstract
Background and Objective: This research was conducted with the aim of investigating the seed yield of rice cultivars (Hashmi, Shiroudi and Fajr) in competition with weeds in three regions of Tarikla, Firouzabad and Firouzjah of Mazandaran province
Materials and Methods: T The experimental factors included three regions Tarikola, Firouzabad and Firouzjah (with elevation of 8, 180 and 400 meters above sea level), three varieties of rice (Hashemi, Fajr and Shiroudi) in two levels of weed infestation (weeding and no weeding).
Results: The results showed that Echinochloa crus-galli, Cyperus rotundus and Paspalum distichum were the dominant weeds in the fields of rice cultivars.The highest weed density was observed in Hashemi variety in all three regions, and the density of weed species was higher in the final harvest stage than in other stages. The results showed that different regions (with different elevation above the sea level) have significantly influenced seed yield in rice cultivars. The seed yield of all three cultivars was higher in Tarikola fields. The lowest seed yield among the three regions was observed in Firouzjah farms, where the seed yield of Hashemi, Fajr and Shiroudi cultivars was 2709.26, 3174.59 and 4441.09 kg.ha-1, respectively. Among rice cultivars, the highest grain yield was related to Shiroudi cultivar.
Conclusion: According to the findings of this study, the percentage of yield loss in Hashemi cultivar was higher than the other two cultivars. Due to having a higher competitive index under weed-infested conditions, Shiroudi cultivar has a lower yield loss than Fajr and Hashemi.
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