Chemical Response of Citrus Rootstocks to Spraying with Coconut Liquid and Dry Yeast Extract

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 (N %, P%, K%, carbohydrate %, chlorophyll content), 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 (Volkameriana rootstock + coconut liquid 200 ml L-1) and (Volkameriana rootstock + dry yeast extract at a concentration of 8 g L-1) and (coconut liquid 200 ml L-1 + dry yeast extract at a concentration of 8 g L-1) achieved the highest rates in all 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 all the studied growth characteristics (N %, P %, K %, carbohydrate content, and leaf chlorophyll content), as it gave the highest rates of (2.1117%, 0.6867%, 1.9700%, 19.9570%, 4.999 mg. fresh weight-1) respectively.