Effect of Foliar Application with Growth Regulators CPPU and Seaweed Extract Oligo-x on Some Growth Characteristics of Sour Orange Rootstock

Abstract

The study was conducted in the lath house of Horticulture department and Landscape Design, College of Agriculture, Abu- Ghraib, Baghdad from September 2015 to September 2016 to study the effect of foliar spray by plant growth regulator Solution of CPPU and seaweed extract of Oligo-x on growth of sour orange seedlings. A factorial experiment was conducted with Randomized Complete Block Design (RCBD) with three replicates. The experiment included a foliar spray by growth regulator solution of CPPU at four concentration 0, 4, 8 and 12 mg L-1, and sprayed at three level of seaweed extract of Oligo-x 0, 2 and 4 ml L-1. Results showed that the two factor of study influenced significantly in all of the studied traits, especially, the foliar spray treatment by growth regulator CPPU with 12 mg L-1 concentration, and sprayed at 4 ml L-1 level of seaweed extract Oligo-x, which showed a significant increase in number of leaves, leaves area, average increase in stem diameter, the percentage of suitable transplants for budding, dry weight of vegetative system, the stem content of carbohydrate, concentration of nitrogen in leaves and leaves content of chlorophyll, while the control treatment recorded the lowest average of these properties.