Investigating the effects of ethephon (2-chloroethylphosphonic acid) on Persian walnut fruit quality

Reza Khosravi Zanjani, Majid Abdouss and Mohsen Mohammadi
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Reza Khosravi Zanjani: Amirkabir Nanotechnology Research Institute (ANTR), Amirkabir University of Technology, Tehran, Iran
Majid Abdouss: Department of Chemistry, Amirkabir University of Technology, Tehran, Iran
Mohsen Mohammadi: Department of Agricultural Economics and Management, Payame Noor University (PNU), Tehran, Iran

Horticultural Science, 2025, vol. 52, issue 3, 250-260

Abstract: The darkness of the kernel and the lack of simultaneous ripening of the mesocarp and endocarp are among the most significant challenges in Iranian walnut orchards. The mentioned problems appear more in areas with hot and humid summers. The research focused on the quality of the kernel in terms of colour and marketability, as well as the dry matter of the kernels. Additionally, the ease of mesocarp separation from endocarp was examined. Experimental trials were designed with 27 treatment combinations to address the mentioned issues using varying concentrations of 2-chloroethylphosphonic acid (ethephon) at different harvest dates. In this study, using 1 920 ppm of ethephon on August 22nd resulted in the best quality walnut kernels and mesocarp. Researchers in this project successfully achieved the highest quality of walnut kernels and nuts in a region where over 90% of the harvest consisted of dark-kernel walnuts.

Keywords: ethephon; kernel darkness; ripening; walnut (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlhor:v:52:y:2025:i:3:id:82-2023-hortsci

DOI: 10.17221/82/2023-HORTSCI

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