South African Journal of Agricultural Extension, Vol. 44 No. 2, 2016: pp.1 – 18Various practices including Nitrogen fertilization have been recommended in the Njombe District to maintain its status as one of the districts that is famous in maize production in Tanzania. Despite the recommendation the level of adoption is not convincing that forced this study to investigate variables that are most important in determining the adoption behaviour. A cross sectional research design was used to collect data from 113 respondents selected from four villages namely, Ulembwe, Igagala, Kibena and Uwemba. The statistical package for social sciences (SPSS) was used for data analysis. The findings reveal that the intervening variables (like efficiency misperception (EM), need tension (NT), prominence and knowledge) played a great role in determining the adoption behaviour compared to independent variables (like age, sex, level of education, farm size and area under maize production). It is therefore recommended that more emphasis should be placed in addressing intervening variables in order to enhance adoption in the study area.