Respon Pertumbuhan Tunas pada Berbagai Ukuran Bulbil Porang (Amorphophallus muelleri Blume) dengan Pemberian Berbagai Konsentrasi Zat Pengatur Tumbuh Giberelin

Abstract

This study aims to determine the effect of various weight sizes and concentrations of gibberellin growth regulators on the growth of porang bulbil shoots (Amorphophallus muelleri Blume). This research was conducted at the Tuber Study Center Land, Faculty of Agriculture, Universitas Sumatera Utara, Medan with an altitude of ± 25 meters above sea level from February 2025 to May 2025. This study used the Randomized Block Design (RAK) method with 2 treatment factors and 3 replications. The first factor is the weight size of the bulbil (U), namely U1 (5 grams) and U2 (10 grams). The second factor is the concentration of Gibberellin, namely GA3 (K), namely K0 (0 mg/L), K1 (250 mg/L), K2 (500 mg/L) and K3 (750 mg/L). The parameters observed in this study include sprouting power, days of shoot emergence, number of shoots, shoot height, leaf emergence age, number of leaves, stem diameter and root length. The results showed that the treatment of bulbil weight size had a significant effect on sprouting age, plant height at 11 and 12 MST. The provision of GA3 had a significant effect on sprouting age, plant height at 7,8,9,11 and 12 MST, number of leaves and stem diameter. The interaction between the two treatments did not have a significant effect on all parameters.