The main objective of this study is to investigate the determinants of Adoption and use intensityrnof Organic Fertilizer in Ejere District, West Shoa, Oromia, Ethiopia. Primary cross-sectionalrndata was collected from systematically selected 53 adopters and 151 non- adopters of organicrnfertilizer. The study employed probit model and the analysis was made using Craggâ€™s doublernhurdle. The empirical Results revealed that age of household negatively influenced decision tornadopt organic fertilizer while livestock numbers, extension contacts, access to informationrnmedia, membership to farmer based organizations, farm experience and farm income positivelyrninfluenced the decision to adopt organic fertilizer. However, the study found out that gender,rnhousehold head education, and distance to near market have statistically insignificant impact onrnadoption of organic fertilizer. In addition, this study found that being single, divorced orrnwidowed significantly decreases the adoption of organic fertilizer while getting married hasrnopposite impact. Whatâ€™s more, farm size and membership to farmer groups influenced intensityrnof adoption positively while farm income and application frequency influenced use intensity ofrnorganic fertilizer negatively. This study also has an important policy implication. The findings ofrnthis study imply that appropriate and adequate extension services have to be provided in linernwith current agricultural development policies of the country. The government body of therndistrict should encourage entrepreneurs to invest in organic fertilizer processing plants. Therngovernment should assign skilled and disciplined agricultural extension workers and mustrnclosely follow the performance the assigned extension workers to ensure that the farmers get thernexpected services. The policy makers should target at enabling farmers to have access torninformation media such as radio, and encouraging farmersâ€™ group formation and membership tornsuch organizations. Improving farmer access to credit facilities needs to be enhanced. Thernnational government along with local government should investment on the educational sector,rnexpanding of infrastructural facilities, creating market activities, and building institutions. Therngovernment should encourage farmers to rear animals under intensive livestock managementrnsystems that support more livestock units per unit of land for provision of manure. This studyrnwould like to invite researchers to conduct more investigation on farmersâ€™ perception towardsrnorganic fertilizer and income and welfare impact of using organic fertilizer in the study area.