The objective of this paper is twofold. First, using a three rounds panel data of 7110 households,

we investigate the adoption decisions and the complementarities among the four labor-intensive

technologies (agricultural extension service, irrigation, soil conservation and planting seeds in a

row) and a comprehensive use of four modern inputs (improved seed variates, inorganic

fertilizer, pesticides, organic fertilizer) which have been frequently adopted by smallholder

farmers. Second, controlling for the dynamic effects of wealth, previous technology adoptions

and other cofounders, we estimate the impact of agricultural extension services and other

multiple technology adoptions on food and nutrition security of the smallholder farmers in

Ethiopia. The estimation results indicate that a significant complementarity between modern

inputs and labor-intensive technologies. This suggests that the adoption of modern inputs

induces farmers to adopt labor-intensive technologies and vice versa. In addition, our finding

suggests that farmers who adopt technologies once are more likely to adopt the technologies

again, reflecting the profitability of agricultural technology adoption. Our finding also indicates

that agricultural extension services and technology adoption have a statistically significant and

positive impact on nutrition and food security.