Genotypic variation in nitrogen fixation characteristics in faba bean ( Vicia faba L.) under contrasting phosphorus fertilizer regimes

Assessment of the genetic variability is an important step in improving nitrogen (N 2 ) fixation potential of faba bean ( Vicia faba L.) genotypes. The study was conducted to evaluate the genotypic variation for symbiotic N 2 fixation traits of faba bean under contrasting phosphorus (P) fertilizer regimes. Twenty and 12 genotypes in the field and greenhouse, respectively, were planted under two P fertilizer regimes (P− and P+ corresponding to 0 and 46 kg/ha) using a randomized complete block design with three replications. Analysis of variance indicated highly significant ( p