Growth and Yield of Lettuce (Lactuca sativa L.) in a Hydroponic Wick System Using Two AB Mix Formulations Partially Substituted with Liquid Organic Fertilizer

Ellok Dwi Sulichantini; Alvera Prihatini Dewi Nazari; Eunike Rama Sari

doi:10.55927/mudima.v6i10.139

Authors

Ellok Dwi Sulichantini Mulawarman University
Alvera Prihatini Dewi Nazari Mulawarman University
Eunike Rama Sari Mulawarman University

DOI:

https://doi.org/10.55927/mudima.v6i10.139

Keywords:

AB Mix, Liquid Organic Fertilizer, Lettuce, Partial Fertilizer Substitution, Wick Hydroponics

Abstract

Reducing dependence on synthetic fertilizers is an important consideration in hydroponic production, particularly because commercial AB Mix formulations contribute substantially to production costs. Liquid organic fertilizer (LOF) may serve as a partial substitute because it supplies nutrients and plant growth-regulating compounds, although its nutrient concentration is generally lower than that of AB Mix. This study evaluated the response of lettuce to different proportions of LOF substituted for two AB Mix formulations and identified the substitution level that maintained satisfactory growth and yield in a hydroponic wick system. The experiment was conducted in Sidomulyo Village, Anggana District, Kutai Kartanegara Regency, East Kalimantan, from March to May 2024. A single-factor experiment was arranged in a randomized complete block design with seven replicates and two treatment series. The Goodplant series consisted of g0 (100% Goodplant AB Mix), g1 (75% AB Mix + 25% LOF), g2 (50% AB Mix + 50% LOF), and g3 (25% AB Mix + 75% LOF). The Meroke series consisted of m0 (100% Meroke AB Mix), m1 (75% AB Mix + 25% LOF), m2 (50% AB Mix + 50% LOF), and m3 (25% AB Mix + 75% LOF). Analysis of variance showed that nutrient substitution significantly affected lettuce growth and yield. The highest values for several yield-related traits were recorded under m0, including leaf width (11.66 cm), leaf length (18.51 cm), taproot length (27.00 cm), plant fresh weight (78.49 g), root fresh weight (5.85 g), and stem diameter (1.00 cm). Importantly, replacing 25% of AB Mix with LOF did not significantly reduce growth or yield compared with the corresponding 100% AB Mix treatments. Under the conditions of this study, LOF can therefore replace up to 25% of AB Mix in a lettuce wick-hydroponic system.

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