Effects of seeding rates on yield and some agronomical traits of barley promising lines of cold region.

In order to evaluate the yield response of promising barley lines to seeding rates, an experiment was conducted in Agriculture Research Stations of Torogh and Jolgeh- rokh in crop seasons of 2002 and 2003. The experiment was arranged in Randomised completly blocks desigen with three replications. The treatments resulted from the factorial combination of four lines (CB-79-10, CB-79-13, CB-79-18, CB-74-2) and five seeding rates (250, 300, 350, 400, and 450 seeds/m2). The results of first year showed significant differences of lines in plant height, spike length, number of spikes in square meter, and TKW of lines was significant difference in Toroq station.The maximum and minimum grain yields obtained from CB-79-13(3875 kg/h) and CB-79-18(3730.6 kg/h) respectively. The effect of different seed rates was significant only for straw yield and harvest index. The maximum and minimum grain yields of 3870.4 and 3723.4 kg/ha obtained from 300 and 350 seeds/sqm respectively. The interaction effect between line and seed rates was no significant for all investigated traits. The results of second year showed significant difference for plant height, spike length, number of spike per square meter, number kernel per spike, and TKW in Toroq station.The maximum and minimum grain yield were obtained from CB-79-18 (6906.4 kg/h) and CB-74-2 (6377.8 kg/h) lines respectively. The effect of different seed rates was significant on spike length, number of spikes per square meter, TKW, and harvest index. The maximum and minimum grain yields were obtained from 300(3870.4 kg/h) and 350(3723.4 kg/h) seeds per square meter. The interaction between line and seed rates was no significant for all investigated traits. The results of first year showed significant difference for plant height, spike length, number of spike per square meter, TKW, grain yield, biologic yield, straw yield, and harvest index in Jolgeh-rokh station.The maximum and minimum grain yield were obtained from CB-74-2(5606.3 kg/h) and CB-79-13(5322.3 kg/h) lines respectively. The effect of different seed rates was significant on spike length, number of fertile spike per square meter, number kernel per spike, thousand kernels weight, grain yield, biological yield, straw yield, and harvest index. The maximum and minimum grain yields obtained from 450(5720.8 kg/h) and 250(5029.6 kg/h) seeds per square meter. The interaction between line and seed rates was no significant for all investigated traits. The results of second year showed significant difference for plant height, spike length, and TKW in Jolgeh-rokh station.The maximum and minimum grain yield were obtained from CB-79-10(7978.9 kg/h) and CB-79-18 (7312.1 kg/h) lines respectively. The effect of different seed rates was significant on number of fertile spike per square meter, and thousand kernels weight. The maximum and minimum grain yield were obtained from 400(7864.3 kg/h) and 450(7541.9 kg/h) seeds per square meter. The interaction between line and seed rates was no significant for all investigated traits.