Background: Sowing date and planting density are the main factors playing a prominent role in determining the yield of crops. Sowing date has the most significant impact on the phonological and growth characteristics of plants compared to other crop traits. On the other hand, in low planting densities, environmental facilities, including light, space, water and soil, are not optimally used, ultimately reducing yield. Sesame yield is highly variable depending upon the growing environment, cultural practices and cultivars. Methods: The study was planned to determine the effect of different sowing date (April 10th, May 10th and June 10th) and planting densities (20, 30 and 40 plants/m2) on three sesame varieties (Balkh, Baghlan and Samangan), during the 2022 and 2023 cropping seasons at the experimental field of Samangan University, Afghanistan. The experiments were conducted as split-plot factorial in randomized complete blocks design with three replications. Result: The results revealed significant effects of sowing date and plant density on all studied traits across both years. The highest seed yield (1.6 t/ha) was achieved with Balkh variety, sown on April 10th and a plant density of 40 plants/m2. Conversely, Baghlan variety, sown on June 10th, at 20 plants/m2, yielded the lowest (0.9 t/ha) in 2022. The study underscores the importance of sowing date and plant density in optimizing sesame yield. Early sowing (April 10th) and higher plant density (40 plants/m2) were associated with superior seed productivity, highlighting their significance for sesame cultivation in the region.
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