Germplasm×environment interaction and stability for seed yield components and maturity duration in mungbean

In the present investigation, twenty five mungbean (Vigna radiata L. Wilczek) germplasms were evaluated in 8 environments in West Bengal during the pre-kharif season (summer) for five years (2012–2016). The main purpose of the investigation was to estimate the stability of yield and maturity duration of twenty five germplasms for improving selection in mungbean. The study was conducted using a randomized block design with three replications. G × E interaction and yield stability were estimated using Eberhart and Russell model. The pooled mean study revealed a wide range of variation for seed yield and its components across environments.The environment 8 (E8) which had average rainfall and temperatures as well as slightly more acidic soil pH than other location was found to be a more favorable environment for better expression of pods plant-1, seed pod-1, seed yield plant-1 and early maturity.The results of the combined analysis of variance showed highly significant variance for both germplasms, environments and interaction effect, which ultimately emphasized the utilization of stability analysis in crop improvement programme. On the basis of stability parameters, the high yielding early maturing germplasms B1, UPM-99-3 and Shonamung 1 exhibit the stable performance across the environments. The germplasms such as APDM-116, 24 Pargana Local and Shonamung 2 recorded favourable mean performance for all the parameters studied, but their performance was unstable due to significant deviation from regression.A correlation study following Spearman’s coefficient of rank correlation recorded the presence of a highly significant link between pods plant-1 with seed yield and plant height with maturity duration suggests that seed production is mostly depends on pods whereas early maturity on plant height.