study for yield and quality traits in 14 domestic populations of bitter vetch (vicia ervilia) in optimum and dry condition in khoramabad, iran

in order to study of variation and relationships between yield and quality traits, 14 domestic populations of bitter vetch (vicia ervilia) were collected from different parts of lorestan province and sown in two separate experiments under irrigated and dry land farming system using randomized complete block design with three replications in khorramabad, iran during 2005 and 2006. data were collected and analyzed for dry matter (dm) yield, and quality traits. results of combined analysis showed significant differences between two conditions for all of traits. in comparison between two conditions, the higher production and higher forage qualities were obtained for irrigated and dry land farming system respectively. the effect of genotype was significant for dm yield and water soluble carbohydrates (wsc). genotypes of fahre (aligudarz), noorabad and sarvand (berojerd) with average values of 65.4, 22.8 and 19.6% had higher values for dry matter digestibility (dmd), wsc and crude protein (cp), respectively. dm yield was negatively correlated with wsc and positively correlated with crude fiber (cf). correlation between dmd vs. acid detergent fiber (adf) and cp vs. wsc were negatively significant. using bi-plot diagram based on droughtresistance indices, the sensitive and tolerant genotypes were identified. fahre (aligudarz), koehdasht, malakhan (noorabad) and kahriz (khorramabad) with average values of 2 to 2.25 ton/ha dm yield had higher production in both conditions and recommended for cultivaton in semiarid region of lorstan province. among them, fahre (aligudarz) and kahriz (khorramabad) had higher quality. genotypes of masoudabad (azna), zaghah (khorramabad) and aleshtar with average values 1.77 to 1.84 ton/ha dm yield, were identified as tolerant to dryness.