Document Type : Original Article
Authors
Department of Field crops and Medicinal Plants, College of Agricultural Engineering Sciences, University of Salahaddin, Erbil, Iraq
Abstract
During the growth season 2023–2024 Grdarasha Field was the site of the field experiment in the Erbil region at Salahaddin University's College of Agricultural Engineering Sciences. The GPS reading was 415.8 meters above sea level, with latitude 36.10116 ◦N and longitude 44.00925 ◦ E.W. The purpose of the factorial experiment was to estimate the critical period of weed control (CPWC) in Brassica napus L. and the impact of various types of periodic weed interference on winter canola growth, yield, and yield component. Three replications and one factor of treatments were used to arrange the treatments in a randomized complete block design (RCBD). Weeds were manually removed from the crop at 0, 15, 30, 45, 60, 75, and 90 days following the emergence of canola. In each block, one weed free and weed infested control was for all the growing season. The findings indicated that 1000 seed weight and number of siliqua per plant was unaffected by periodic weed interference, and that the leaf area, plant height, main and lateral branches, number of seeds per siliqua, siliqua length, harvest index, biological yield and seed yield all significantly dereased as the duration of weed interference increased. Seed yield was significantly impacted and diminished by prolonged weed interference. According to the study, after (90 days after emergence) duration 6 and weed-infested plots produced much less, at 886.5 kg and 599.0 kg per hectare, but weed-free plots produced 3177.5 kg per hectare. The occurrence of weeds during the entire growing season led to a reduction of 74.71 percent in seed yield when compared to the plots that without of weeds. The critical period for competition between weeds and the canola crop was identified as occurring between the 4 to 6 leaf stages at duration 2 (30 days after emergence).
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