evaluation of barley (hordeum vulgare l.) and faba bean (vicia faba l.) yield in different density and mixture intercropping via competition indices

in order to study the intercropping of barley (hordeum vulgare l.) and faba bean (vicia faba l.) an experiment was conducted as factorial based on randomized complete block design with two factors and three replications at sari agricultural science and natural resources university during 2009. the first factor was two seed ratios include d1: 75 and 150 kg.ha-1 of faba bean and barley, respectively (optimum seed ratio) and d2: 100 and 200 kg.ha-1 of faba bean and barley, respectively (high seed ratio) and the second factor consisted of different planting ratio, p1: sole cropping of faba bean, p2: 50% faba bean + 50 % barley, p3: 75% faba bean + 25% barley, p4: 25% faba bean + 75% barley, p5: sole cropping of barley. land equivalent ratio (ler) indicated that intercropping of 25% faba bean + 75% barley was better than 50% faba bean + 50% barley. according to significant interaction effects of density and intercropping ratio in terms of seed yield and some competitive indices for both crop species, the highest barley and faba bean yield (3306.66 and 4884.56 kg.ha-1, respectively) were observed in sole cropping with high density. in this experiment, the 75 % faba bean + 25 % mixture with high density was recorded highest intercropping yield, barley aggressivity value and 27% yield increases of barley in mix-proportion compared to sole crops. also, the most of faba bean aggressivity value and faba bean yield increases in mix-proportion compared to sole crop were obtained when 25% faba bean + 75% barley mixture with optimum density was used. furthermore the 75% faba bean + 25% barley treatment plus optimum seed ratio had highest system productivity index.