Effect of pinching, paclobutrazol and kinetin on the growth and flowering of Cassia Occidentalis

Abstract

The experiment was conducted in lathhouse of the Agricultural Preparatory School / Abi Ghareq for the spring season 2022_2023 to study the effect of fencing and spraying with paclobuterol and kinetin and its interaction on the growth and flowering traits of Cassia Occidentalis.Where the symbol for pinching is C1 and no edging is C0, the plants were sprayed with three concentrations of paclobetrazole with two concentrations (0, 0.5 and 1 g. L^-1) and its symbol is (P0, P1, P2), and the plants were sprayed with kinetin at concentrations (0, 50 and 100 mg.L^-1) and its symbol (K0, K1, K2. It was conducted as a factorial experiment (2*3*3) in a split-plot design according to a Complete Randomized Blocks Design (R.C.B.D) with three replicates .Where each replicate contains 18 treatments with five plants per experimental unit (one plant per pot), the pinching represented the main plot and the concentrations of paclobetrazole and kinetin and their interactions represented the sub plot .The averages were compared using the Least Significant Difference L.S.D test at the 5% level, and the results showed excelled of edging on without pinching in the traits of the leaf area (587.75 cm²) and the number of flowering inflorescences (3.33 inflorescences.plant^-1),The treatment of paclobetrazole with a concentration of (1 g.L^-1) excelled in plant height (17.15 cm), leaf area (346.17 cm ²), length of internodes (1.94 cm), and number of inflorescences (2.7 inflorescences. plant^-1). While the treatment of kinetin with a concentration of (100 mg.L^-1) excelled in length of the internodes (1.66 cm), the diameter of the flower (3.13 cm), while the treatment of Kinetin with a concentration of (50 mg.L^-1) excelled in leaf area (630.20 cm2