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Journals / Erciyes Tarım ve Hayvan Bilimleri Dergisi / 2026 / Volume: 9

Effects of Kaolin Application on Leaf Chlorophyll Content and SPAD Values in Some Walnut Cultivars

Kaolin Uygulamasının Bazı Ceviz Çeşitlerinde Yaprak Klorofil İçeriği ve SPAD Değerleri Üzerine Etkileri

Safder Bayazıt(HATAY MUSTAFA KEMAL UNIVERSITY)0000-0003-4619-3891
Kazim Gunduz(MALATYA TURGUT OZAL UNIVERSITY)0000-0002-6473-5909
Oğuzhan Çalışkan(HATAY MUSTAFA KEMAL ÜNİVERSİTESİ, ZİRAAT FAKÜLTESİ, BAHÇE BİTKİLERİ BÖLÜMÜ)0000-0002-2583-9588
Pages
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Publication Date
2026-06-02
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

These results revealed that kaolin is a practical cultural strategy for walnut-growing regions where thermal and radiation stress during the summer months can reduce physiological performance.

📌 3 Key Takeaways

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Objective & Hypothesis:This study evaluated the effects of kaolin particle film application on leaf chlorophyll content and SPAD values in various walnut (Juglans regia L.) cultivars grown under Mediterranean climatic conditions.
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Key Findings & Data:The plant material included Bilecik, Kaplan86, Malatya1, Şebin, Şen1, Tokat1, Yalova1, Yalova3, Yalova4, Yavuz, and 77H1.
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Conclusion & Impact:These results revealed that kaolin is a practical cultural strategy for walnut-growing regions where thermal and radiation stress during the summer months can reduce physiological performance.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Juglans regia · genotype respone · correlation

Abstract

This study evaluated the effects of kaolin particle film application on leaf chlorophyll content and SPAD values in various walnut (Juglans regia L.) cultivars grown under Mediterranean climatic conditions. The plant material included Bilecik, Kaplan86, Malatya1, Şebin, Şen1, Tokat1, Yalova1, Yalova3, Yalova4, Yavuz, and 77H1. Compared with control trees, kaolin-treated trees had higher chlorophyll a, chlorophyll b, total chlorophyll, and SPAD values in most genotypes. On average, chlorophyll a increased from 0.85 to 1.18 mg/g FW , chlorophyll b from 0.38 to 0.53 mg/g FW, total chlorophyll from 1.23 to 1.72 mg/g FW , and SPAD values from 38.24 to 40.91 under kaolin treatment, indicating that kaolin particle film can effectively mitigate heat and light stress by preserving photosynthetic pigments and chlorophyll status. These results revealed that kaolin is a practical cultural strategy for walnut-growing regions where thermal and radiation stress during the summer months can reduce physiological performance.

Özet

Bu çalışmada, Akdeniz iklim koşullarında yetiştirilen farklı ceviz (Juglans regia L.) çeşitlerinde kaolin partikül film uygulamasının yaprak klorofil içeriği ve SPAD değerleri üzerindeki etkileri değerlendirilmiştir. Bitki materyali olarak Bilecik, Kaplan86, Malatya1, Şebin, Şen 1, Tokat 1, Yalova 1, Yalova 3, Yalova 4, Yavuz ve 77H1 genotipleri kullanılmıştır. Kontrol ağaçlarıyla karşılaştırıldığında, kaolin uygulanmış çoğu genotipte klorofil a, klorofil b, toplam klorofil ve SPAD değerleri daha yüksek bulunmuştur. Ortalama değerler olarak, kaolin uygulamasında klorofil a 0,85'ten 1,18 mg/g FW'ye, klorofil b 0,38'den 0,53 mg/g FW'ye, toplam klorofil 1,23'ten 1,72 mg/g FW'ye ve SPAD değerleri 38,24'ten 40,91'e yükselmiştir. Bu durum, kaolin uygulamasının fotosentetik pigmentleri ve klorofil durumunu koruyarak ısı ve ışık stresini etkili bir şekilde azaltabileceğini göstermiştir. Bu sonuçlar, kaolinin yaz aylarındaki termal ve radyasyon stresinin fizyolojik performansı düşürebildiği ceviz yetiştirme bölgeleri için pratik bir kültürel strateji olduğunu ortaya çıkardı.

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Cite This Article

Bayazıt, S., Gunduz, K., Çalışkan, O. (2026). Effects of Kaolin Application on Leaf Chlorophyll Content and SPAD Values in Some Walnut Cultivars. Erciyes Tarım ve Hayvan Bilimleri Dergisi, Volume: 9. https://doi.org/10.55257/ethabd.1924315

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