Drought susceptibility index and correlation of soybean based on yield and yield component

Abstract

The objectives of this study were to know drought susceptible and resistant varieties of soybean-based on the average value of drought susceptibility index and correlation of yield and yield components traits under drought stress condition. This study was conducted using an experimental method and was laid out using Factorial Completely Randomized Design (CRD), two factors with three replicates of each experimental unit. Factor 1 soybean variety consists of 7 genotypes: Lawit, Sibayak, Kaba, Pangrango, Seulawah, Nanti, and Burangrang, and factor 2 drought stress condition: no drought stress (reasonable condition), drought stress during the vegetative phase, drought stress during the generative phase, and drought stress during vegetative and generative phases. Yield component traits observed were the number of pod per plant, number of empty pod per plant, number of filled pod per plant, number of seeds per plant, the weight of 100 dry seeds, and seed weight per plant. Based on the results of the study, it can be concluded that: 1). Variety of Sibayak and Nanti, were classified as resistance to drought stress either during the vegetative phase, generative phase, or continuous drought. 2). The highly significant positive correlation of among yield and yield components of soybean under drought stress were: seed weight per plant - number of pods, seed weight per plant - number of filled pods, and seed weight per plant - number of seed per plant, while highly significant negative correlation occurred in the character of flowering date - 100 seed weight.