TY - JOUR ID - 82906 TI - Effect of Redroot Pigweed (Amaranthus retroflexus L.) and Barnyard Grass (Echinochloa crus-galli (L.) P. Beauv) Interference on Yield and Essential Oil of Fennel (Foeniculum vulgare Mill.) JO - Journal of Crops Improvement JA - JCI LA - en SN - 2008-8337 AU - hosseini valiki, seyedeh roghaye AU - Abbasi, Rahmat AU - Pirdashti, Hemmatollah AU - Akbarpour, Vahid AD - Ph.D. Student, Department of Agronomy, Faculty of Crop Science, Sari Agricultural Sciences and Natural Resources University, Sari, Iran. AD - Assistant Professor, Department of Agronomy, Faculty of Crop Science, Sari Agricultural Sciences and Natural Resources University, Sari, Iran. AD - Professor, Department of Agronomy, Faculty of Crop Science, Sari Agricultural Sciences and Natural Resources University, Sari, Iran. AD - Assistant Professor, Department of Horticulture Science, Faculty of Crop Science, Sari Agricultural Sciences and Natural Resources University, Sari, Iran. Y1 - 2022 PY - 2022 VL - 24 IS - 2 SP - 645 EP - 658 KW - Density KW - Essential oil KW - interference KW - Weed Competitivity KW - Weed free DO - 10.22059/jci.2021.308374.2436 N2 - Weed infestation in arable lands is much more than one species. Thus, it is important to pay attention to the interaction of multy species of weeds. To study the effect of redroot pigweed (Amaranthus retroflexus L.) and barnyardgrass (Echinochloa crus-galli (L.) P. Beauv) interference on yield and essential oil of fennel (Foeniculum vulgare Mill.), an experiment has been done in Research field of Sari Agricultural Sciences and Natural Resources University during 2017. It has been arranged in a factorial arrangement based on randomized complete block design with three replications with the experimental factors being three densities of redroot pigweed (0, 4, and 8 plants m-2) and three densities of barnyardgrass (0, 4, and 8 plants m-2). The highest grain yield (2230 kg ha-1) and essential oil content (2 %) are obtained at weed free plots. The density of 8 redroot pigweed plants m-2 at simultaneous interference with 0, 4, and 8 barnyard grass m-2 reduce grain yield by 30.1%, 62.9%, and 75.7%, and essential oil content by 24.5%, 26.2%, and 29.5%, respectively, compared with weed free plots. The coefficient of redroot pigweed competitivity is predicted to be higher than barnyardgrass, and the interference of 14.5 barnyardgrass plants m-2 or 7.7 redroot pigweed plants m-2 decreases fennel grain yield by 50%. UR - https://jci.ut.ac.ir/article_82906.html L1 - https://jci.ut.ac.ir/article_82906_302980be8aa0e2c8d1372822da65a886.pdf ER -