بررسي كمي و كيفي علوفه در 36 جمعيت از گونه Festuca arundinacea Schreb. بمنظور معرفي ارقام مناسب براي اصلاح مراتع و توليد علوفه در چراگاههاي مناطق سردسيري استان اردبيل

Study of quantities and quality forage yield on 36 population of tall fescue (Festuca arundinacea scherb.) order to introduce for pasture and rangelands improvement in Ardabil province

In order to determine the best populations for both yield and quality traits, 36 populations of tall fescue iFestuca arundinacea) were evaluated using a triple lattice design in Ardabil, Iran during 2005-2006. The data were collected for heading date, plant height, dry matter yield and five quality traits dry Matter digestibility (OMO), water soluble carbohydrates (WSC), crude protein (CP), acid detergent tiber (A OF) and total ash over two years . Near infrared spectroscopy was used for estimation of the quality traits. Result showed significant difference among populations for all of traits except the ash, in the first year. The populations VlII (Russia), 782026 (Shahrekord) and 60075 (Tavankesh) with average values 5.76, 5.32 and 5.5 ton/ha had the highest total dry matter production, respectively . They were suggested as the promising populations for produce synthetic varieties. The population s of 60075 (Tavankesh), 60066 (Borojen), had higher and lower values for plant heights, respectively. For heading date, 41 8 (Australia) and 1317 (Iranian Gene bank), were reeognized as latest and earliest populstions, respectively . The populations of 60071 (Borojen) and 078 (USA) had the higher values for OMO. Results of correlation analysis showed that OMO was positively correlated with WSC, while the correlation among AOF with both OMO and WSC was negative. Heading date was negatively correlated with both OM yield and plant height. The relationships among OM yield with both OMO and WSC were weak and non significant. It was concluded that the population VIlI (Russia), 782026 ( Shahre kord) and 60075 (Tavankesh) with higher forage production and 60071 (Borojen) and 078 (USA) with higher quality were suggested as the best populations for cultivation in semi steppe area of northwest of Iran .