Optimizing the Growth and Flowering of Gladiolus (Gladiolus grandiflorus L.) cv. Arka Amar: Date of Planting & Gibberellic Acid Effects

Abstract

Twelve treatment combinations of the date of planting and gibberellic acid treatment of the corm were replicated three times in the Randomized Block Design (RBD) factorial concept investigation conducted in Gladiolus (Gladiolus grandiflorus L.) cv. Arka Amar during the 2022–2023 rabi season at SOADU, Bhubaneswar (Odisha). The findings showed that on September 15, the planting date and dipping the corms with 150 ppm GA3 concentration resulted in the maximum number of sprouting (2.56), plant height (62.42 cm), number of floret per spike (20.72), floret length (11.56 cm), rachis length (68.41 cm), vase life (7.33 days), and diameter of harvested corm (5.71 cm). Comparably, on November 15th planting with a 100 ppm GA3 concentration of corm treatment, the number of leaves/plant (14.47) and spike length (88.49 cm) demonstrated the greatest results; on October 15th planting, with a 150 ppm GA3 concentration of corm treatment, the least number of days required for spike initiation (72.73) and total number of corms per plot (67) was concluded. Maximum flowering time of 10.2 days was noted in planting on September 15th, using corms bathed in 100ppm GA3. The optimal way to maximize gladiolus cv. Arka Amar flowering and yield was determined in treatment 15th of September planting with dipping corms at 150 ppm GA3 concentration. In general, the research of maximizing gladiolus development by taking into account planting dates and the impacts of gibberellic acid is crucial for raising scientific understanding of gladiolus agriculture as well as yield, quality, and resource efficiency.