Weeds are significant risk factor in the competitive plant production. In Hungarian agricultural practice there are many different ways of weed management with herbicides (whole spraying, brand spraying). Practice of precision farming technology became increasingly common in Hungarian agriculture. As it was verified in the previous research the precision weed management is adaptable mostly in wide spaced cultures. The main purpose of this study is to analyse the material and operation costs of the precision weed management technology in corn (maize), and sunflower. The research consider yields growth and investment costs comparing to the conventional whole spraying technologies.