Potassium is a key macronutrient for shallot (Allium cepa L. var. aggregatum) production, directly influencing leaf development, bulb formation, and yield. Excessive reliance on mineral potassium fertilizers, however, increases production costs and can degrade soil quality. Organic amendments such as banana peel compost tea offer a sustainable alternative by supplying residual potassium and organic matter, though their efficiency often depends on soil nutrient availability. This study evaluated the residual effects of banana peel compost tea in combination with mineral potassium sources on shallot growth and yield. A completely randomized design was employed with five treatments and three replications: control (A0), 150% compost tea residue (A1), 125% compost tea residue + 25% KCl (A2), 50% compost tea residue + 100% KCl (A3), and 150% KCl (A4). Growth observations included plant height and leaf number at 14, 28, and 42 days after planting, while yield parameters were assessed at harvest (85 days). Potassium uptake was also analyzed. Results indicated that A2 significantly outperformed other treatments across all parameters. At harvest, A2 produced the largest bulb diameter (3.1 cm), the greatest fresh weight per plant (41.2 g), and the highest yield (14.8 t ha⁻¹ equivalent). Potassium uptake was also maximized in A2 (2.85%), reflecting improved nutrient use efficiency. Treatments with only compost tea or only KCl produced intermediate results. The findings suggest that banana peel compost tea residues, when supplemented with moderate mineral potassium, can optimize shallot growth and yield while reducing dependence on synthetic fertilizers. This integrated approach provides a practical strategy for sustainable shallot cultivation and contributes to the recycling of agro-waste resources.
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