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Salt stress is a major abiotic stress that exerts detrimental effects on plant growth, development and yield worldwide. Humic acid (HA) is a naturally occurring component of soil and a major element of biostimulant (BS). It has the potential to alleviate different abiotic stresses in plants effectively. However, the putative physiological mechanism underlying HA-alleviated salt stress in finger millet is unknown. The possible role of HA in improving finger millet salt stress resistance was investigated through a physiological, biochemical and molecular analysis. The results showed that HA improved growth, leaf relative water content (LRWC), and photosynthetic pigment in finger millet under salt stress. Meanwhile, HA mitigated salt-induced oxidative stress by decreasing lipid peroxidation and generating reactive oxygen species through an enhanced antioxidant system. Particularly, HA increased the activity of superoxide …