<![CDATA[Accurate and environmentally friendly fertilization is essential to optimize the growth of vegetable crops. This study aims to examine the effects of coconut water-based Liquid Organic Fertilizer (LOF) on the growth and yield of red amaranth (Amaranthus tricolor L.) under different application frequencies. The experiment was conducted from February to April 2025 at the Greenhouse of the Faculty of Agriculture, Sam Ratulangi University, Manado. A Completely Randomized Design (CRD) was used with four treatments: F0 (control/no LOF), F1 (LOF application once per week), F2 (twice per week), and F3 (three times per week), with each treatment receiving 250 ml per liter of water. Each treatment was replicated four times for a total of 16 experimental units and 32 plants. Observed parameters included plant height, number of leaves, and fresh weight. The results showed that application of coconut water LOF once a week (F1) significantly improved plant height, leaf number, and biomass compared to the control. However, increasing frequency beyond once a week (F2 and F3) did not lead to significant improvements, suggesting that one weekly application is sufficient and efficient. Therefore, coconut water-based LOF is recommended as an effective, eco-friendly alternative for red amaranth cultivation. Keywords: Red amaranth, Amaranthus tricolor L., liquid organic fertilizer, coconut water, frequency, plant growth]]>
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