Lentil (Lens culinaris) cultivation in cool-season pulse areas faces severe yield decline from soil-borne vascular wilt fungi and leaf rusts, notably Vascular Wilt (Fusarium oxysporum f. sp. lentis), Collar Rot (Sclerotium rolfsii), and Lentil Rust (Uromyces viciae-fabae). Fusarium persists in field soils, penetrating root systems during early growth and causing seedling stunting, yellowing, and death. Treating lentil seeds or applying Bacillus subtilis via soil furrow drench creates an active biological barrier around taproots and lateral roots. The bacteria colonize root tissues, producing cyclic lipopeptides (surfactin, iturin, fengycin) that disrupt fungal spore germination and stop hyphal colonization in soil.

Beyond disease control, Bacillus subtilis acts as an efficient plant growth-promoting rhizobacterium (PGPR) in pulse crops. It solubilizes fixed soil phosphorus, secretes siderophores for iron mobilization, and works synergistically with native Rhizobium leguminosarum strains to enhance root nodulation. Stronger root growth supports efficient moisture uptake during terminal dry spells, encourages uniform flowering, and increases seed weight per pod. Regular application ensures clean, high-grade lentil seed production suitable for domestic and international pulse markets.

Importance of Bacillus subtilis in Lentil Cultivation

Lentil is a nitrogen-fixing legume that depends on healthy roots and efficient Rhizobium nodules for optimum growth and grain production. Healthy root systems improve water uptake, nutrient absorption, and biological nitrogen fixation while increasing tolerance to environmental stress.

Bacillus subtilis rapidly colonizes the rhizosphere and competes with harmful fungi and bacteria for nutrients and space. It also produces natural antimicrobial metabolites that suppress disease-causing organisms while encouraging beneficial microbial populations.

Healthy roots and active nodules promote vigorous vegetative growth, better flowering, improved pod development, and higher seed yield.