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Aprilia R, Miftakhurrohmat A. Cultivation of Pakcoy Mustard (Brassica rapa L.) in a Hydroponic System in a Surabaya Vegetable Garden: Analysis of Plant Nitrogen Requirements: Budidaya Sawi Pakcoy (Brassica rapa L.) pada Sistem Hidroponik di Kebun Sayur Surabaya: Analisis Kebutuhan Nitrogen Tanaman. PELS [Internet]. 2026 Feb. 4 [cited 2026 Feb. 11];8(2). Available from: https://pels.umsida.ac.id/index.php/PELS/article/view/2520