Author(s):

Khushboo Chandra, Anil Pandey, SB Mishra and Kavita

Abstract: Modern agriculture is facing multiple challenges including the necessity for a substantial increase, in production to meet the needs of a burgeoning human population. Water shortage is a deleterious consequence of both population growth and climate change and is one of the most severe factors limiting global crop productivity. In order to study correlation and cause effect of deficit irrigation on some physiological traits on yield an experiment on Indian mustard (Brassica juncea L. Czern & Coss), was conducted in Randomized Complete Block Design (RBCD) accommodating 20 genotypes, from various Rapeseed & Mustard centres located across country, randomly in three replications during Rabi 2016-17, one subjected to a drought regime inside the Rainout shelter under residual moisture condition and another one provided with normal irrigated field condition in Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur. Analysis of variance revealed considerably exploitable variability for all the 15 traits. Under both conditions of phenotypic correlation revealed that grain yield per plant showed significant and positive correlation with RWC, LMSI, CC, CA, PERO, PRO, RGR, LAI, SLW, OY except ELWL. Phenotypic path coefficient under both condition revealed that all the physiological parameters showed the low direct effect except oil yield showed high direct effect on grain yield per plot. This indicated that improvement in all the physiological parameters which showed significant positive effect and direct effect on grain yield per plot will ultimately enhances the grain yield.

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