Soybean is a species of legume native to East Asia. It has very high oil (18%) and protein (36%) content. The most important abiotic environmental element for it is the amount and distribution of precipitation. We have examined two soybean varieties, Sinara and Sigalia. They were examined in evapotranspirometers, located at the Agrometeorological Research Station, University of Pannonia, Georgikon Faculty. There were four pieces of each varieties, they were tested with two different water supplies. The purpose of our examinations was to measure the weight change with two different water supplies due to two different soy types. Key Words: soybean, Sinara, Sigalia, evapotranspiration bath, water supply