The aim of the study was to obtain the best rice washing water for the growth and yield of lettuce. The method used in this study was the Randomized Block Design (RBD) method, with 6 treatments and 3 replications and each replication had 3 plants, so in total there were 54 plants. Research treatments: PO = control or without giving rice washing water, P1 = giving 0.25 ℓ of rice washing water,…