Abstract
The experiment was carried out at the Horticulture Farm of Bangladesh Agricultural University (BAU), Mymensingh during the epoch from November, 2020 to April, 2021 with the aim to observe the outcomes of plant spacing and indole-3 acetic acid (IAA) concentrations on the vegetative growth, flowering and yield features of gladiolus. The research was two factors, Factor A: three plant spacing viz. S<sub>1</sub> = 15 cm x 25 cm, S<sub>2</sub> = 20 cm x 25 cm, S<sub>3</sub> = 25 cm x 25 cm and Factor B: different concentrations of indole-3-acetic acid (IAA) viz. I<sub>1</sub>= IAA 0 ppm, I<sub>2</sub>=100 ppm and I<sub>3</sub>=150 ppm. It was Randomized Complete Block Design with three replications. The 25 cm × 25 cm spacing showed best performance in respect to plant height (69.88 cm), yield of flower (162.22 t ha<sup>-1</sup>), yield of corm (15.65 t ha<sup>-1</sup>), and yield of cormel (14.32 t ha<sup>-1</sup>) than the other spacing. Application of IAA at a rate of 150 ppm was initiated to be excellent for plant height (68.51 cm), yield of flower (162.67 t ha<sup>-1</sup>), yield of corm (15.57 t ha<sup>-1</sup>) and yield of cormel (13.93 t ha<sup>-1</sup>). Regarding the combined effect of treatments, 150 ppm IAA with wider plant spacing was found to be best for plant height (70.73cm), yield of flower (166.67 t ha<sup>-1</sup>), diameter of corm (7 cm) and weight of cormel per plant (81.87gm). Considering the above findings, it was apparent that the combination of 25 cm × 25 cm spacing with 150 ppm IAA application was suitable for better growth, flowering and yield/production of gladiolus.
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