Остання редакція: 2021-06-03

#### Тези доповіді

**Purpose.** Planting density is an important factor that influences the yield and yield component of bread wheat (*Triticum aestivum* L.) genotypes. The objective of this study was to determine the influence of the seeding rate on the grain yield and yield component of winter wheat genotypes. **Methods.** In the experiment, a total of 8 genotypes and three seeding density (400, 500 and 600 seed per square meter) were evaluated during the 2015-2016 and 2016-2017 growing season. The experiment was conducted in the randomized completely blocks design in the split block with three replications. Grain yield, number of spike per square meter, number of kernel and spikelet per spike, peduncle length, spike length, flag leaf area, and normalized difference vegetative index (NDVI) were investigated. **Results.** Analysis of the variance showed that there were significant differences between years, among genotypes and their interaction. Genotype G6 had a higher grain yield (7730 kg ha^{-1}), and G1 the lowest yield (4994 kg ha^{-1}). Genotype G2 had a higher spikelet number per spike (19.28), G4 kernel number per spike (44.78), G3 spike number per square meter (592.9), and G1 had a higher flag leaf area (26.20 cm^{2}) and NDVI. The data showed that the seeding density differed non-significantly for the grain yield. The use of 500 seeds per square meter produced a higher grain yield of 6280 kg ha^{-1} than other seeding density used. The use of 400 seed per square meter produced higher peduncle length (31.04 cm) and spike length (8.94 cm). In the case of seeding rates, the maximum spikelet number per spike (17.90) was observed with a seeding density of 400 grain per square meter. Among seeding densities, the maximum spikelet number per square meter (535.6) and flag leaf area (24.51 cm^{2}) was obtained when a seeding density of 500 kernel numbers per square meter was used. **Conclusion.** Although the effect of seed density was not significant, the highest yield was determined in 500 seeds. The use of 400 seed per square meter produced higher peduncle length and spike length. The maximum spikelet number per spike was observed with a seed rate of 400 grain. Among seeding rates, the maximum spikelet number per square meter and flag leaf area was obtained when using seeding densities of 500 kernel numbers per square meter was used.