Impact of Zn, Yeast and Naa Foliar Spray on Fruiting Aspects and Fruit Attributes of Washington Navel Orange Trees.

Document Type : Original Article

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Horticulture Department, Faculty of Agriculture, Benha University, Moshtohor, Toukh 13736, Egypt.

Abstract

        This study was conducted in 2022 and 2023 on 7-year-old Washington navel orange trees budded on Sour orange rootstock and grown in clay loamy soil in Qaliobiya Governorate. The study aimed to improve fruiting aspects and fruit attributes through foliar feeding with Zn in two forms (sulfate at 6.0 g/L and Zn-NPs at 6.0 ml/L), yeast at 2.0 % and NAA at 100 ppm. The trees were foliar sprayed 6 times starting from mid-Feb., after fruit set (mid-April) and every month till August. The results reflected that all treatments significantly enhanced the studied parameters than the control. Furthermore, fruit aspect values including (fruit set %, fruit retention %, the number of fruits/tree, fruit weight and yield) were maximized when the trees were sprayed with Zn-NPs at 6.0 m/L + Yeast at 2.0 %. Unlike, such treatment minimized fruit drop %. Regarding fruit attributes, it was clear that Zn-NPs at 6.0 m/L + Yeast at 2.0 % treatment caused a high increment in fruit length, diameter, fruit shape index, fruit volume, fruit juice volume, fruit juice %, TSS, TSS/acid ratio and vitamin C. Unlike, such treatment reduced fruit juice acidity % to the lowest value.

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