Abstract

Salt stress is one of the major abiotic stresses that affect normal growth, development and biochemical processes of knolkhol (Brassica oleraceavar. gongylodes L.). In order to studying the salinity stress effects resulted from NaCl on vegetative growth and yield performance of four knolkhol cultivars was tested during Rabi season of 2021-2022 at Bangladesh Agricultural Research Institute, on-farm research division, Daulatpur, Khulna. The experimental design was completely randomized design arrangement in factorial with three replications. The first factor was four knolkhol cultivars included Mollica, challenger, Early, lucky and second factor consist of different salinity stress levels included 0, 4, 8 and 12dSm-1 NaCl in a pot experiment. The results demonstrated that different salinity levels had significant effect on growth and yield contributing characters of knolkhol. Results of root length, root fresh weight, total leaf number plant-1, total leaf weight plant-1, knob fresh weight plant-1, knob dry weight plant-1, knob length and knob diameter found better in 0dSm-1 salt and significantly decreased with high salt stress at 12dSm- 1. Among four genotypes the results revealed that all growth and yield parameters performed better in early variety compared to others. In general, the lowest values were noted under Mollica and Challenger. Interaction effects of salinity level and different genotypes had a significant variation on growth and yield contributing characters of knolkhol. From all the interaction combinations 0dSm-1 salinity level and early genotype gave the maximum value of almost all observations. As of the findings of the study conducted, it is inferred that treatment combination 0dSm-1 salinity level with early genotype is most suitable for knolkhol cultivation.

Keywords:Knolkhol; Genotype; Salinity stress; Growth and yield