Author(s):

C Muruganandam, TR Barath Kumar, S Madhavan and SR Raajmohan

Abstract: Studies on propagation in jack (<em>Artocarpus heterophyllus </em>Lam.) was carried out at Department of Horticulture, Faculty of Agriculture, Annamalai University. Twelve genotypes <em>viz., </em>AH-1 to AH-12 were used in the investigation. Based on germination percentage and seed vigour AH-5 was identified as best genotype for rootstock. In order to increase seedling vigour the seeds of AH-5 were treated with bio regulators <em>viz., </em>NAA (100 ppm, 200 ppm, 300 ppm and 400 ppm) and IBA (100 ppm, 200 ppm, 300 ppm and 400 ppm). Among nine treatments soaking of seeds for 24 hours in 400 ppm of IBA gave superior performance. The experiment to find out the optimum age of rootstock for successful softwood grafting revealed that 150 days of old seedlings exhibited highest percentage of successful grafts. Significant interactions were observed for germination per cent, plant height, number of leaves, leaf length, leaf breadth and stem girth etc. The best growth attributes were observed in AH-5 which recorded higher germination percentage, plant height, number of leaves, leaf length, breadth and stem girth. Among the different age of rootstocks tried for softwood grafting, maximum graft union success was recorded in 150 days old rootstocks and it was followed by 120 days old rootstocks.

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