This study aims to determine the best dosage of cow manure to support the growth and yield of Lettuce plants. This research was conducted from September 2022 to October 2022 at Kertapati Palembang City, South Sumatra. This study used a randomized block design (RBD). With 5 treatments and 3 repetitions. The treatment consisted of S0 = control or without cow manure, S1 = 200 grams of cow manure p…