Role of Etiolation, Auxinic and Non-Auxinic Chemicals on Root Initiation of Air-Layers of Jack Fruit (Artocarpus Heterophyllus Lam.).

Maximum rooting success of 98.30 per cent was obtained in jack fruit layers with IBA-1000 ppm incombination with ferulic acid 1000 ppm. Root number, root length and dry weight of rootsper layer increased with auxin concentration and application of ferulic acid and p-hydroxybenzoic acid. Etiolation of shoots prior to layering markedly increased rooting and had beneficial effects on root characters but did not exhibit any beneficial effect on survivality of rooted layers.