Abstract
The vigor of indole 3-butyric acid (IBA) induced rooting of stem cuttings and its suitable sprouting/rooting medium can be evaluated using sprouting value index, which is developed in Pongamia pinnata, a nitrogen fixing, avenue and medicinal tree species of the tropics. Field studies were carried out using three rooting medium at a location in Central Kerala, Peninsular India, during the months of February (P1), June (P2), and October (P3) in 2009, 2010 and 2011. Field trials were performed using 300 ppm, 500 ppm and 1000 ppm IBA. The control cuttings do not recorded rooting. The results obtained indicate high SVI (sprouting value index) for aerial shoot cuttings planted in root trainers with coir pith compost (RTCP) with all the three concentration of IBA applied. Sprouting percentage was increased and the speed of completion of sprouting/rooting initiation decreased by the use of IBA treatment. Increased CWR and SUP percentages indicate defects in management practices, dormancy and or the genotype of the cultivar.
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