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Journals / Black Sea Journal of Agriculture / 2026 / Cilt: 9 Sayı: 1

The Effects of Cluster Thinning Yield and Quality on ‘Horoz Karası’ Cultivar of Grapevine

Bestami Gün(TOKAT GAZIOSMANPASA UNIVERSITY)0009-0008-2292-6230
Seda Sucu Dağ(TOKAT GAZİOSMANPAŞA ÜNİVERSİTESİ)0000-0002-5187-5048
Nazım Şekeroğlu(GAZİANTEP ÜNİVERSİTESİ)0000-0002-0630-0107
Pages
1–8
Publication Date
2025-12-18
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AI Summary & Key Takeaways

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

Considering the results, it was concluded that cluster thinning, currently applied to other grape varieties, also had a positive effect on the physical, chemical, and phytochemical properties of the 'Horoz Karası' variety.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:In this study, it was aimed to determine the effects of different levels of bunch thinning treatments (S1/Control: 20 clusters/vine; S2: 16 clusters/vine; S3: 12 clusters/vine; S4: 8 clusters/vine; S5: 4 clusters/vine) on yield and quality parameters in Horoz Karası (Vitis vinifera L.) grape variety.
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Key Findings & Data:Considering the results; S2 cluster thinning level stood out with a cluster length of 21.26 cm, a cluster weight of 752.13 grams, and a berry width of 21.50 mm.
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Conclusion & Impact:Considering the results, it was concluded that cluster thinning, currently applied to other grape varieties, also had a positive effect on the physical, chemical, and phytochemical properties of the 'Horoz Karası' variety.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:Total phenolic · Cluster width · Yield

Abstract

In this study, it was aimed to determine the effects of different levels of bunch thinning treatments (S1/Control: 20 clusters/vine; S2: 16 clusters/vine; S3: 12 clusters/vine; S4: 8 clusters/vine; S5: 4 clusters/vine) on yield and quality parameters in Horoz Karası (Vitis vinifera L.) grape variety. Within the scope of the study, the effects of different cluster thinning treatments on cluster weight, berry weight, berry weight, berry width, berry length, pH, TSS (water soluble dry matter), total acidity, total phenolic content and total antioxidant capacity of grapes were analyzed and evaluated. Considering the results; S2 cluster thinning level stood out with a cluster length of 21.26 cm, a cluster weight of 752.13 grams, and a berry width of 21.50 mm. S3 treatment gave the highest values in terms of berry length and hundred-berry weight (29.15 mm; 791.43 g). S1 cluster thinning level stood out with a cluster width of 15.75 cm and a vine head yield of 14.15 kg. When the effects of bunch thinning treatments on chemical and physiological characteristics were examined, it was determined that although there was no significant difference between the values obtained in terms of pH, total acidity (TA), TSS and maturity index (MII), the bunch thinning treatment at S3 level had the highest values in terms of both total phenolic matter content and total antioxidant capacity on phytochemical parameters. Considering the results, it was concluded that cluster thinning, currently applied to other grape varieties, also had a positive effect on the physical, chemical, and phytochemical properties of the 'Horoz Karası' variety. Implementing this type of treatment on this variety, which is used for various purposes (table and drying) across a wide geography, is anticipated to shed light on future studies by testing different levels of cluster thinning and incorporating it into different cultural practices.

Özet

In this study, it was aimed to determine the effects of different levels of bunch thinning treatments (S1/Control: 20 clusters/vine; S2: 16 clusters/vine; S3: 12 clusters/vine; S4: 8 clusters/vine; S5: 4 clusters/vine) on yield and quality parameters in Horoz Karası (Vitis vinifera L.) grape variety. Within the scope of the study, the effects of different cluster thinning treatments on cluster weight, berry weight, berry weight, berry width, berry length, pH, TSS (water soluble dry matter), total acidity, total phenolic content and total antioxidant capacity of grapes were analyzed and evaluated. Considering the results; S2 cluster thinning level stood out with a cluster length of 21.26 cm, a cluster weight of 752.13 grams, and a berry width of 21.50 mm. S3 treatment gave the highest values in terms of berry length and hundred-berry weight (29.15 mm; 791.43 g). S1 cluster thinning level stood out with a cluster width of 15.75 cm and a vine head yield of 14.15 kg. When the effects of bunch thinning treatments on chemical and physiological characteristics were examined, it was determined that although there was no significant difference between the values obtained in terms of pH, total acidity (TA), TSS and maturity index (MII), the bunch thinning treatment at S3 level had the highest values in terms of both total phenolic matter content and total antioxidant capacity on phytochemical parameters. Considering the results, it was concluded that cluster thinning, currently applied to other grape varieties, also had a positive effect on the physical, chemical, and phytochemical properties of the 'Horoz Karası' variety. Implementing this type of treatment on this variety, which is used for various purposes (table and drying) across a wide geography, is anticipated to shed light on future studies by testing different levels of cluster thinning and incorporating it into different cultural practices.

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Cite This Article

Gün, B., Dağ, S. S., Şekeroğlu, N. (2025). The Effects of Cluster Thinning Yield and Quality on ‘Horoz Karası’ Cultivar of Grapevine. Black Sea Journal of Agriculture, Cilt: 9 Sayı: 1, 1–8. https://doi.org/10.47115/bsagriculture.1792498

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