Effect of Calcium Chloride and Gibberellic Acid on the Vegetative Growth of Two Cultivars of Gladiolus Gladiolus hybrid L.

Abstract

This study was conducted inside the wooden canopy of the Department of Horticulture and Landscape Engineering / College of Agriculture and Forestry / University of Mosul during the agricultural season 2022-2023. To study the effect of spraying with different concentrations of calcium chloride (0, 500, 1000) mg. L-1 and spraying with gibberellic acid at concentrations of (0, 100, 200) mg. L-1 and the interaction between them in vegetative of two cultivars of Gladiolus Gladiolus hybrid. L. They are Nova lux with yellow flowers and Trader Lux with red flowers. The corms were planted on 17/3/2022, then sprayed 30 days after planting the corms with three sprays and three concentrations of calcium chloride (0,500, 1000) mg.L-1 The plants were also sprayed with gibberellic acid, with three sprays and three concentrations (0, 100, 200), The period between one spray and another was two weeks. The spraying was done with gibberellic acid after 35 days of planting the corms. The study was carried out using a factorial experiment in the design of completed randomized sectors R.C.B.D within split plots with three replications, each experimental unit included (7) cormat for each replicate. The research results of were analyzed statistically with the (SAS) program and tested statistically using Duncan’s multinomial test at the probability level of 0.05. It was found that the red cultivar recorded the largest plant height, which reached 129.905 cm, the largest leaf length, which reached 102.584 cm, and the largest number of leaves, which reached 9,980 leaves. Plant-1, and the largest leaf area of the plant, amounting to 401.656 cm2. plant-1, and the largest dry weight of the leaves, amounting to 12.567 g. The yellow variety plants also recorded the largest values for the percentage of total chlorophyll in the plant, which amounted to 0.984%. The treatment with gibberellic acid at a concentration of 200 mg also resulted. L-1 led to a significant increase in all studied traits.