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 2026, 8.