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Comparison of foliar fertilizers and growth regulators on pre-harvest drop and fruit quality of ‘Thompson Navel’ orange

Yaser Mollapur
  • Department of Horticulture, Karaj Branch, Islamic Azad University, Karaj, Islamic Republic of Iran
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Seied Mehdi Miri
  • Department of Horticulture, Karaj Branch, Islamic Azad University, Karaj, Islamic Republic of Iran
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Ebrahim Hadavi
  • Department of Horticulture, Karaj Branch, Islamic Azad University, Karaj, Islamic Republic of Iran
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2016-12-12 | DOI: https://doi.org/10.1515/opag-2016-0015


An investigation was carried out to determine the ability of foliar fertilizers and growth regulators to prevent pre-harvest drop and enhance navel orange fruit quality. Fifteen year old trees of the Thompson Navel orange variety were sprayed with aqueous solutions of one of the following: methanol (0.13%), calcium nitrate (0.25%), zinc sulfate (1%) + urea (0.5%), fermented sugar- cane extract (2.8%), salicylic acid (1 or 3 mM), citric acid (5 mM), or 2,4-dichlorophenoxyacetic acid (2,4-D) (0.002%). Results indicated that foliar treatment with 2,4-D reduced fruit drop (2.6%) as compared to the control (15.2%). Fruit decay was delayed and flavor improved by 5 mM citric acid. Weight loss was reduced after 3mM salicylic acid applica- tion, while methanol (0.13%), salicylic acid (1 and 3 mM) and citric acid (5 mM) caused a delay in fruit coloring.

Keywords: Orange; Fruit drop; Foliar treatments


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About the article

Received: 2016-09-02

Accepted: 2016-11-10

Published Online: 2016-12-12

Citation Information: Open Agriculture, Volume 1, Issue 1, ISSN (Online) 2391-9531, DOI: https://doi.org/10.1515/opag-2016-0015.

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©2016 Yaser Mollapur et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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