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 2022, 1, 1440-1449.