Yogi Kurnia Putra, Des M, Irma Leilani Eka Putri, and Violita Violita. “The Effect of Use Ground Coffee (Coffea Arabica L.) As a Addition Nutrition To The Growth of Lettuce Plants (Lactuca Sativa L.) In Hydroponics Systems”. Prosiding Seminar Nasional Biologi, vol. 1, no. 2, May 2022, pp. 1498-0, doi:10.24036/prosemnasbio/vol1/274.