Effects of sowing dates and Cycocel application on yield and yield components of barley (Hordeum vulgar) cultivars in Mazandaran

In order to investigate effects of different sowing dates and Cycocel application on yield and yield components of barley (Hordeum vulgar) cultivars, an experiment was carried out at split factorial in randomized completely block design with three replications at Mazandaran province in 2009-2010. Main factor was sowing dates in three levels including 7 and 26 November and 11 December and subfactor was three cultivar including Sahra, Prodactive and M12 and Cycocel rates in two levels including 0 and 2.8 litr cycocel ha-1 with factorial. Results showed the maximum andminimum of the fertile spikelet percentage per spike, spikelet per plant, grain yield (293.1 and 259.4 g.m2) and harvest index were obtained on 26 November and 11December, respectively. Sahra and M12 cultivar had to most and least of the spikeletper spike, fertile spikelet percentage per spike, spikelet per plant, grain yield (316.9 and 244.4 g.m2), biological yield (719.4 and 614.2 g.m2) and harvest index,respectively. With application of the cycocel, decreased of the plant height, but increased of the fertile tiller per plant, spikelet per spike, fertile spikelet percentage per spike, spikelet per plant, grain yield, biological yield and harvest index. Maximum and minimum of the spikelet per spike, fertile spikelet percentage per spike, spikelet per plant, grain yield and harvest index were obtained in interaction of the 26 November × sahra cultivar and 11 December × M12 cultivar. Therefore planting date of the 26 November, sahra cultivar and application of the 2.8 litr cycocel ha-1 because of the most of increased the yield components and due to grain yield and harvest index introduced the best of treatment.