Aprilia, Radytha, and A. Miftakhurrohmat. 2026. “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”. Procedia of Engineering and Life Science 8 (2). https://doi.org/10.21070/pels.v8i2.2520.