Due to its importance for organic agriculture, one of the most important agriculturalproduction systems, various sources have been proposed to increase soil organic mattercontent. Vermicompost is one of those sources known as the resistant last form offarmyard manure which is degraded by earthworms. Soil organic matter or humus andtheir compounds are nutrient sources that increase physical, chemical and biologicalquality of soil. Humus and humus compounds improve soil physical, chemical andbiological quality parameters increasing rhizosphere aeration and water holding capacity,rehabilitating soil structure, providing plant nutrients and constituting natural media formicroorganisms with their regulative effects on soil reactions. In this study, the effects ofvermicompost on yield and some growth parameters of lettuce were investigated. For thispurpose, a random block designed experiment with 5 different applications wasconducted in 3 replicates. The applications were control, vermicompost applications of100 kg, 200 kg and 300 kg per decare and conventional fertilization. According to theresults obtained, yield and growth parameters were improved by vermicompostapplication when compared to control and conventional fertilization. As a result of thisstudy, it was concluded that 300 kg vermicompost/da is a promising application in lettuceproduction for optimal yield and soil improvement.