EN
The extemal effects of agriculture has got strong link with classical agricultural production. These extemals appear in the soil, in water, in air, and in biodiversity. The key factor of high yield is the soil fertility. The conventional farming system uses all over the filed the highest average amount of fertilizer (synthetic or organic). Precision farming technology is able to ameliorate economic, environmental and social impacts of the agricultural production. The elements of the agricultural production are the same with conventional and with precision farming technology only the amount of the input and the working time are different. So the type of the external is also the same but the dimension of the effect is different. This paper examined the external effects change with adopting precision farming technolog.