MADRAS AGRICULTURAL JOURNAL

Effect of Plant Growth Regulators on Rooting and Sprouting of Different Stem Cuttings ofGuava (Psidium guajava L.) cv. Lucknow-49 under Mist Chamber Condition

Abstract

      An experiment was conducted to study the effect of plant growth regulators on rooting and sprouting of different stem cuttings in guava under mist chamber condition at Horticultural College and Research Institute, Periyakulam, Tamil Nadu. Plant growth regulators viz., Indole-3-Butyric Acid (IBA), Indole-3-Acetic Acid (IAA) and Naphthalene Acetic Acid (NAA) were used at different concentrations and applied to softwood, semi hardwood and hardwood cuttings. The highest sprouting percentage (76.66 %) with early sprouting (19.10 days) was observed in softwood cutting treated with IBA 4000 ppm concentration. The highest number of leaves (25.80) at 90 days after planting was observed in hardwood cutting treated with IBA 4000 ppm concentration. The highest rooting percentage (74.44 %) was recorded in softwood cutting treated with IBA at 4000 ppm concentration. Softwood cutting treated with IBA 4000 ppm exhibited better rooting and sprouting performance as compared to NAA and IAA. Among the three stem cuttings, softwood cutting is an effective explant for faster multiplication.
Key Words: Guava, Stem cutting, Regulators, Rooting, Sprouting and Growth