مقایسه اثر الگوی کشت در تولید دو منظوره (بذر و علوفه) یونجه همدانی در منطقه زنجان

To study the effect of alfalfa cropping patterns on double purpose alfalfa cultivation products (forage yield and seed quantity and quality) a split plot experiment carried out based on randomized block design with four replication in 2012-2013 which row spacing with 4 levels (hand spread, 25, 50, 75 cm) were appointed in main plots and seeding rate in three levels (10, 20 and 30 kg.ha-1) were considered as subfactor. Results show that row spacing has significant effect at 1% on fresh and dry forage yields in all cuts as well as total fresh and dry yield, while it has no significant effect on neither seed yield nor seed quality treatments (1000 seed weight and germination percentage). In contrast, seeding rate (plant density within row) has any significant effect on fresh and dry forage yield in all cuts but it has a significant effect at 1% on seed yield while there was any effect on seed quality treatments (1000 seed weight and germination percentage). Interaction between row spacing *seeding rate has not significant effect on any treatments. Based on the results of this experiment, the best cropping pattern for double purpose cultivation of alfalfa (ecotype Hamedani) in Zanjan provience would be 50 cm between row and 10 kg per ha seeding rate.