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Marpaung, M.; Neneng, L.; Akhmadi, A. The Effect of Organic Biofertilizer on The Growth of Mustard Greens (Brassica Rapa Var. Parachinensis L) in Peat Soils As a Support for Practicum Material for Plant Growth and Development in Grade XII High School. JPMIPA 2021, 2, 33-44.