Influence of PGRs on Sprouting and Early Growth of Ginger Seed Rhizomes in Protray Nursery

Abstract

The study evaluated the influence of plant growth regulators (PGRs) on sprouting and early growth of ginger (Zingiber officinale Rosc.) raised through protray nursery techniques. The experiment was conducted in a Completely Randomized Design (CRD) with seven treatments: IAA (1000 and 500 ppm), BA (1000 and 500 ppm), NAA (1000 and 500 ppm), and an untreated control. Observations on sprouting percentage, shoot traits (plant height, leaf length, leaf breadth, pseudostem girth) and root traits (number and length of roots) were recorded and analyzed. Results revealed that BA at 500 ppm significantly enhanced sprouting (90.22%), promoted early emergence, and recorded the highest shoot and root growth parameters compared to other treatments. The improved performance is attributed to the cytokinin-mediated stimulation of lateral bud break and cell division. These findings suggest that BA 500 ppm is an effective pre-planting seed rhizome treatment for achieving uniform sprouting and vigorous seedling establishment in ginger. Optimizing nursery PGR protocols can enhance propagation efficiency and support sustainable ginger production.