Effects of Foliar Paclobutrazol Applications on Plant Growth, Yield, Quality, and Residue Levels in Greenhouse Cucumber Cultivation

Emine Polat; Naif Geboloğlu; Tarık Balkan; Özlem Yılmaz

doi:10.18016/ksutarimdoga.vi.1699404

TR EN

Yapraktan Paklobutrazol Uygulamalarının Serada Hıyar Yetiştiriciliğinde Bitki Gelişimi, Verim, Kalite ve Kalıntı Düzeyine Etkisi

Öz

Bu çalışmada, serada yetiştirilen hıyar (Cucumis sativus L. cv. Olay F₁) bitkilerinde farklı doz ve aralıklarda yapraktan uygulanan paclobutrazolun (PBZ) bitki gelişimi, verim, meyve kalitesi ve kalıntı miktarına etkisi araştırılmıştır. Araştırma, yarı kontrollü serada tesadüf parselleri deneme desenine göre üç tekerrürlü yürütülmüştür. PBZ, sürgün uçlarına yapraktan 10, 20 ve 40 mg·L⁻¹ konsantrasyonlarında, 7 ve 14 günlük aralıklarla uygulanmıştır. Kontrol grubu için saf su kullanılmıştır. Sonuçta, PBZ uygulamaları bitki boyu ve boğum arası mesafeyi önemli düzeyde azaltöış; 20 mg·L⁻¹ 7-gün PBZ uygulaması en etkili uygulama olmuş ve bitki boyunda %20,3’lük bir azalma sağlamıştır. En yüksek pazarlanabilir verim (184,03 ton·ha⁻¹), 40 mg·L⁻¹ 14-gün PBZ uygulamasından elde edilmiş ve kontrole göre (182,07 ton·ha⁻¹) göre %1,08 oranında daha yüksek bulunmuştur. Öte yandan, 20 mg·L⁻¹ dozunun 7 günlük uygulaması, verimde %11,7 oranında azalma ile sonuçlanmıştır. Pazarlanabilir meyve ağırlığı, 40 mg·L⁻¹ 7-gün PBZ uygulamasında %13,5 artış göstererek 98,44 g olarak belirlenmiş, ancak bu artış, bitki başına meyve sayısında %13,6’lık bir azalmaya neden olmuştur. Klorofil indeks PBZ uygulamaları ile anlamlı düzeyde yükselmiş olup, en yüksek değer (55,47), 40 mg·L⁻¹ 7-gün PBZ uygulamasında gözlemlenmiştir. Kalıntı analizleri sonucunda, hıyar meyvelerinde PBZ’ye ait kalıntı tespit edilememiştir. Sonuç olarak, yapraktan uygulanan PBZ, vejetatif büyümeyi etkin şekilde baskılamış, 14 günde bir uygulanan 40 mg·L⁻¹ PBZ dozu, kompakt bitki gelişimi, meyve ağırlığı ve toplam verim arasında optimal dengeyi sağlamış; meyve kalitesini olumsuz etkilemeden ve kalıntı oluşturmadan etkili sonuçlar vermiştir. Bu sonuçlar, PBZ’nin, sera koşullarında yüksek yoğunluklu hıyar yetiştiriciliği için potansiyel bir büyüme düzenleyici olarak kullanımını desteklemektedir.

Anahtar Kelimeler

Effects of Foliar Paclobutrazol Applications on Plant Growth, Yield, Quality, and Residue Levels in Greenhouse Cucumber Cultivation

Abstract

This study evaluated the effects of foliar paclobutrazol (PBZ) applications at different doses and intervals on plant growth, yield, fruit quality, and residue levels in cucumber (Cucumis sativus L. cv. Olay F₁) cultivated under greenhouse conditions. The experiment was conducted using a randomized complete block design with three replications. PBZ was applied to shoot tips at concentrations of 10, 20, and 40 mg/L, at 7- and 14-day intervals, while distilled water was used for the control group. PBZ treatments significantly reduced plant height and internode length. The most notable reduction in plant height (20.3%) was observed with the 20 mg/L dose applied weekly. The highest marketable yield (184.03 t/ha) was achieved with the 40 mg/L PBZ treatment applied every 14 days, which was 1.08% higher than the control (182.07 t/ha). In contrast, the 20 mg/L weekly application resulted in an 11.7% decrease in yield. The average marketable fruit weight increased by 13.5% (reaching 98.44 g) under the 40 mg/L weekly treatment. However, this increase was accompanied by a 13.6% reduction in fruit number per plant. There was no significant relationship found between chlorophyll index (SPAD) and PBZ applications; however, the highest SPAD value (55.47) was measured in the 40 mg/L 7-day PBZ treatment. Fruit and leaf dry matter contents were not significantly affected. The PBZ doses and application methods used in the study did not leave detectable residues in cucumber fruits, and this finding demonstrates that the application is completely safe for food, representing one of the most critical outcomes of the study. In conclusion, foliar PBZ applications effectively suppressed vegetative growth. The 40 mg/L treatment applied biweekly offered an optimal balance between compact growth, fruit weight, and total yield, without compromising fruit quality. or leaving harmful residues.

Keywords

References

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Details

Primary Language

English

Subjects

Vegetable Growing and Treatment

Journal Section

Research Article

Authors

Emine Polat ^*
0000-0001-5839-9921
Türkiye

Naif Geboloğlu
0000-0003-2495-7088
Türkiye

Tarık Balkan
0000-0003-4756-4842
Türkiye

Özlem Yılmaz
0000-0001-8564-120X
Türkiye

Early Pub Date

February 8, 2026

Publication Date

February 8, 2026

Submission Date

May 14, 2025

Acceptance Date

October 12, 2025

Published in Issue

Year 2026 Volume: 29 Number: 3

DOI

https://doi.org/10.18016/ksutarimdoga.vi.1699404

IZ

https://izlik.org/JA93EB47RG

Cite

RIS / Bibtex

APA

Polat, E., Geboloğlu, N., Balkan, T., & Yılmaz, Ö. (2026). Effects of Foliar Paclobutrazol Applications on Plant Growth, Yield, Quality, and Residue Levels in Greenhouse Cucumber Cultivation. Kahramanmaraş Sütçü İmam Üniversitesi Tarım Ve Doğa Dergisi, 29(3), 599-614. https://doi.org/10.18016/ksutarimdoga.vi.1699404