In graduate thesis, the evaluation of the impact of dry drought reduction of maize and soy yields in the area of Virovitica-Podravina Country in considered. For the calculation of the reference evapotranspiration and the water balance in the soil, climatic data was used in the 30-year period (1986.-2015.) with the meteorological station (MP) Virovitica. Referent evapotranspiration (ET0) is calculated according to the Penman-Montheith method, with a computer program “CROPWAT”. Effective precipitations are calculated using USDA-SCS method (U.S. department of Agriculture-Soil Conservation Service) whose results refer to the water deficit of 305,2 mm in dry years (Fa = 25%) when compared to referent evapotranspiration, but the deficit is also present in the average years (Fa = 50%) and amounts to 64,9 mm. Water loss in ground for maize and soy in dry and average year is calculated using Palmer method (which is adjusted and calibrated according to Vidaček, 1981.), using computer software “Hidrokalk”. Water deficit in the dry year for maize was 453,5 mm, while for soy was 360,7 mm. Water deficit in the average year for maize was 207,0 mm, and for soy 148,4 mm. Yield reduction for maize was 79% in the dry years, and 40% in average years. Yield reduction for soy was 49% in the dry year, and 23% in average years. The levels of yield reduction can be minimized by implementing modern systems of irrigation, rational waste management for both land and water, making more tolerant cultivars, and respecting crop rotation.