Rahmat Syarif, Violita Violita, Irma Leilani Eka Putri, Dezi Handayani. The Effect of Use Ground Coffee (Coffea arabica L.) as a addition Nutrition To The Growth of Spinach Plants (Amaranthus hybridus L.) In Hydroponics Systems. prosemnasbio [Internet]. 2022 May 31 [cited 2024 Sep. 19];1(2):1440-9. Available from: https://semnas.biologi.fmipa.unp.ac.id/index.php/prosiding/article/view/262