Effect of different walnut and hazelnut leaf compost treatments on yield and phenolic composition of Lactuca sativa L.

Medič, Aljaž (author), Solar, Anita (author), Hudina, Metka (author), Veberič, Robert (author), Zamljen, Tilen (author)

The use of compost made from the leaves of Juglans regia has long been controversial because of its inhibitory effect due to the presence of juglone. Therefore, the aim of our study was to replicate the typical habits of farmers and gardeners, where the dried leaves are collected at the end of the season and placed in a composter. Then, the effects of the different treatments on the yield of the plant (lettuce), secondary metabolism, and possible toxicity of the compost of the grown plant were evaluated. The lowest yield of lettuce was obtained in soil with composted walnut and hazelnut leaves, while the highest yield was recorded in in soil with compost control, soil with composted walnut leaves and grass with the addition of composting agent and soil with composted walnut leaves with addition of composting agent. Some allelochemicals were still present in the compost but at such low levels that they did not affect yield. We suggest that dry walnut leaves and cut grass can be used for composting, while dry hazelnut leaves still contain some allelochemicals after two years that significantly inhibit plant growth and thus yield, so we would not recommend their use for composting.

• Language: English
• Keywords: allelopathy, lettuce, naphthoquinones, toxic residues, HPLC, mass spectrometry, LC-M
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 10 str.
• Numbering: Vol. 12, iss. 14, art. 2738
• PID: 20.500.12556/RUL-148239
• UDC: 635
• ISSN on article: 2304-8158
• COBISS.SI-ID: 160627203
• Publication date in RUL: 04.08.2023

Record is a part of a journal

• Title: Foods
• Shortened title: Foods
• Publisher: MDPI
• ISSN: 2304-8158
• COBISS.SI-ID: 512252472

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: oreh, leska, odpadno listje, kompost, solata, fenolne spojine, toksične snovi, zaviranje rasti

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P4-0013-2022
• Name: Hortikultura