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All Journal Teknotan: Jurnal Industri Teknologi Pertanian Jurnal Keteknikan Pertanian Tropis dan Biosistem Jurnal Teknologi Pertanian Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Advances in Food Science, Sustainable Agriculture and Agroindustrial Engineering (AFSSAAE)
Musthofa Lutfi
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Agriculture, Biological Sciences & Forestry Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Industrial & Manufacturing Engineering Mechanical Engineering Other

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GROWTH RESPONSE OF GRAND RAPID LETTUCE (Lactuca Sativa L.) TO ROOT-ZONE COOLING IN DEEP WATER CULTURE HYDROPONICS Joko Prasetyo; Wiryaningtyas Setya Winahyu; Gunomo Djoyowasito; Musthofa Lutfi; Yusuf Hendrawan; Susinggih Wijana
Jurnal Teknologi Pertanian Vol. 27 No. 2 (2026)
Publisher : Fakultas Teknologi Pertanian Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jtp.2026.027.02.3

Abstract

This study investigates the effects of root-zone cooling (RZC) on the growth performance of Grand Rapids lettuce (Lactuca sativa L.) cultivated in a deep water culture hydroponic (DWC) system. The experiment evaluated three cooling treatments 15 °C, 20 °C, and 25 °C applied for 8 hours daily, with an untreated control group for comparison. Morphological parameters including plant height, leaf area, SPAD value, root length, and fresh weight were measured over a 30-day growth period. Results demonstrated that RZC significantly improved all growth metrics compared to the control. The 25 °C treatment consistently outperformed other groups, yielding the tallest plants (32 cm), largest leaf area (200 cm²), and highest fresh weight (97.5 g), indicating enhanced nutrient uptake and photosynthetic activity. Root length was also maximized at 20 °C and 25 °C, reflecting improved root system development under moderate cooling. While chlorophyll content (SPAD value) showed less variation among treatments, temperatures below 20 °C appeared to limit metabolic efficiency. These findings confirm that RZC, particularly at 25 °C, enhances morphological development and biomass accumulation in hydroponic lettuce, offering a promising strategy for optimizing growth under warm environmental conditions. The study underscores the importance of precise root-zone temperature control as a sustainable intervention to mitigate heat stress, improve resource use efficiency, and boost productivity in soilless cultivation systems.
Co-Authors . Herianto Adi Prismantoko Ahmad Syamsun Injilauddin Alifah Maulidiyah Andi Anggara Ary Mustofa Ahmad Bambang Dwi Argo Bambang Dwi Argo BAMBANG SUSILO Darwin Kadarisman Elwin Elwin Eva Widiarti Budi Wardani Ferys Ika Oktavia Fiedro Dimiyadi Firdiani Nur Afifah Firli Fibbianti Gunomo Djoyowasito Hanafi Prida Putra Hariana Hariana Hendri Setiawan Impi Widuri Aprillianingtias Inggar Rayi Agatha Johan Ari Sandra Joko Prasetyo Khusna Fauzia La Choviya Hawa La Choviya Hawa Lita Puspita Rizka Perdana Masruroh Masruroh Maya Lisa Moch. Bagus Hermanto Mochammad Bagus Hermanto Muhammad Husain Kamaluddin Nugroho Nimpuno Rendhi Prastya Riski Kurniawan Ryan Maulana Abdul Hakim Sandro Niko Gultom Surya Putra Susinggih Wijana Swasti Riska Putri Syaifuddin Purwo Utomo Taif Maharsyah Tri Nurhayati Wahyunanto Agung Nugroho Widyaningrum widyaningrum Wiryaningtyas Setya Winahyu Yusuf Hendrawan Yusuf Hendrawan