The seeds of Rangpur lime were treated with different concentrations of GA3 (50, 100 and 150 ppm), NAA (50, 100 and 150 ppm), potassium nitrate (1.0, 1.5 and 2.0 %), thiourea (1.0, 1.5 and 2.0 %) and control (water soaked). The seeds were soaked for 24 hours in 100 ml of solutions of different concentrations. The experiment was carried out adopting Complete Randomized Design with thirteen treatments and replicated thrice under shade net conditions. The treated seeds of Rangpur lime were sown on raised beds at 10 cm row-to-row distance, 5 cm plant-to-plant distance and 3 cm deep. Seeds treated with GA3 150 ppm and GA3 100 ppm exhibited superior results in germination percentage, number of days taken for initiation of germination and overall seedling growth of Rangpur lime.
Treatment GA3150 ppm recorded higher germination (92.99%) at the end of six week , ERI (67.71) and BRI (0.619), more shoot (5.33 cm) and root length (10.36 cm), more fresh (96.25 mg) and dry weight (14.68 mg) of Rangpur lime seedlings , maximum SVI (705.19) and least days (11.66 days) took for germination under shade net conditions. In general pre-soaking treatment to the seeds with different growth regulator and chemical solutions were found to be beneficial to improve the germination percentage compared to control under shade net conditions.