Effect of growth regulators on rooting of black pepper (Piper nigrum) Cuttings

Abstract

In the present study 80 per cent rooting was obtained by favourable growth regulator treatment when raised in an ideal rooting medium under greenhouse conditions. The study pointed out that, among the different growth regulator formulations tried, IBA 1000 ppm formulation helped in better induction of rooting by over 70 per cent as against 43.33 per cent in the control. The next promotive effect in this regard was by treatment of IBA 500 ppm and NAA 250 ppm which recorded 66.67 and 63.33 per cent respectively. However, use of higher concentration of growth regulators, especially IBA at 1500 ppm and NAA at 1000 ppm and their combination at 1000 ppm adversely affected the rooting of cuttings indicating higher concentrations of growth regulators may become toxic to black pepper cuttings.