Abstract
A field experiment was carried out during the winter season 2020-2021 in the AL-Sufia area, east of Ramadi, to estimate effect of spraying cytokinin on the growth and yield of barley (Hordeum vulgare L.). By using the split plot plate arrangement by randomized complete block design (RCBD) with three replications, the study included two factors, the first factor, three concentrations of cytokinin 0 (K1), 30 (K2) and 60 (K3) mg L-1. taken and sprayed on the vegetative part in equal parts for two sprays, each spraying 0, 15 and 30 mg L-1 when the first vegetative branch appeared. The second factor is the planting dates and they were Oct 25th , Nov 10th, Nov 25th and Dec 10th, and the symbols (D1, D2, D3, D4) were taken. Concentration of 60 mg L-1 of cytokinin significantly affected the yield characteristics and its components, as this concentration recorded the highest average in the characteristics number of grains in the spike, weight of 1000 grains, and grain yield was 26.20 grains in the spike-1 and 53.77 g. and 5.633 ton H-1 respectively. The planting dates also had a significant effect on the yield characteristics and its components, second date superior Nov 10th in most of the studied traits, and the yield traits recorded the highest rates in the trait of the number of spikes 402.7 spikes m-2 and number of grains spike 26.17 grain spike-1, and grain yield amounted to 6.198 ton h-1
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