Foliar sprays based on malic acid, citric acid and potassium sulfate improve several qualitative and quantitative traits of pistachio nuts
Improvement of some growth properties of herbaceous plants in stress condition by citric acid and malic acid sprays are reported earlier. This research evaluates these substances on the pistachio tree as an important domestic product. The early splitting and brown kernel occurrence rate were observed as signs of aflatoxin contamination potency and status. The study was conducted in a minimally cultivated orchard of the 'Kallehghoochi' cultivar of pistachio. The treatments were as follows; 1 mM malic acid, 3 mM malic acid, 3 mM citric acid, 3% potassium sulphate, 5% potassium sulfate, 3% potassium sulfate + 1 mM malic acid, 0.1 mM salicylic acid, 0.1 mM salicylic acid + 3 mM citric acid and the control treatment. Except for SA 0.1 mM, the rest of the treatments reduced the percentage of early split pistachio nuts having brown color in the intra-cotyledonary region, down to 50%; however, the fall was significant in 3 mM citric acid, which was reduced by 96% to 10.6 brown kernel per 10000 nuts. All treatments significantly controlled the sunburn damage of pistachio nuts. Treatments containing 1 mM malic acid were superior to control in taste as determined by panelists.
Saboory, A., Hadavi, E. and Imani, A. (2016). Foliar sprays based on malic acid, citric acid and potassium sulfate improve several qualitative and quantitative traits of pistachio nuts. Acta Hortic. 1109, 137-142
aflatoxin contamination, brown kernels, Pistacia vera