Effect of Spraying with Coconut Liquid and Yeast Extract on Vegetative Growth Traits of Citrus rootstock (Citrus aurantium and Volkameriana)

Abstract

The experiment was conducted in the plant canopy at Horticulture and Landscape Department, College of Agriculture / University of Kerbala, Iraq for the period from mid-February to the end of June 2023 using Randomized Complete Block Design (R.C.B.D) as a factorial experiment with three factors: citrus rootstock (Citrus aurantium and Volkameriana) and coconut liquid extract with three concentrations of (0, 100, 200) ml L-1 and dry yeast extract in three concentrations (0, 4, 8) g L-1 and with three replications. The most important results indicated the superiority of the Volkameriana rootstock in most of the studied growth characteristics (plant height, stem diameter, number of leaves, leaf area, shoot dry weight), while the treatment of coconut liquid 200 ml L-1, as well as the treatment of dry yeast extract with a concentration of 8 g L-1 achieved a significant superiority for the above studied traits and gave the highest rates. The two-way interaction treatment between (rootstock and coconut liquid) and (rootstock + dry yeast extract) not a significant, as for and (coconut liquid 200 ml L-1 + dry yeast extract at a concentration of 8 g L-1) achieved the highest rates in most of the studied traits. The triple interaction treatment (Volkameriana rootstock + coconut liquid 200 ml L-1 + dry yeast extract at a concentration of 8 g L-1) achieved significant superiority in most of the studied growth characteristics (seedling height, stem diameter, number of leaves, leaf area, shoot dry weight). While the triple overlap treatment (Citrus aurantium + coconut liquid 200 ml L-1 + dry yeast extract at concentration of 8 g L-1) achieved the highest rate of relative moisture content of the leaves, as it gave the highest rates (38.833 cm, 4.2033 mm, 78.667 leaves seedlings-1, 2398.67 cm2, 37.863 g seedlings-1) (70.3 15%, respectively.