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Effect of Foliar Spraying with Potassium Silicate and Some Microelements on the Yield of Apple cv. Ibrahimi

Department of Horticulture and Landscaping, College of Agriculture, University of Anbar, Iraq
*(e-mail:; Mobile: 00964 79067 31031)
(Received: May 20, 2022; Accepted: June 26, 2022)


The experiment investigated the effect of foliar spraying of potassium silicate and IQ COMBI Agri-
fertilizer which contained some micronutrients, on quality and quantity traits of the yield of apple
cultivar Ibrahimi. The foliar spraying was with potassium silicate at levels 0, 1.5, 3 and 4.5 ml/l with
symbols S0, S1, S2 and S3 representing the first factor. While the foliar spraying with agri-fertilizer IQ-
COMBI at levels 0, 1 and 2 g/l and its symbols were Q0, Q1 and Q2, respectively, representing the
second factor. Potassium silicate and IQ COMBI had a significant impact on increasing the yield and
improving its quality traits. The S2 level revealed the highest increase in the yield of one tree and the
average weight of the fruit, which increased by 11.13 and 9.19%, respectively, compared to the S0 level.
Q2 was characterized by the highest increase in the fruits’ total sugars and vitamin C content. The yield
and the average fruit weight at this level increased by 7.85 and 7.01%, respectively, compared to the Q0
level. The interaction between the factors also significantly impacted the traits. The highest increase in
the yield at treatment S2Q1 reached 21.61% compared to the control treatment.
Key words : Foliar spraying, potassium silicate, IQ-COMBI, apple