The paper describes the composition of cost production of maize for grain in the years 2005-2007 in Bieganowo farm near Września Bieganowo (52^o14’ N; 17^o37’ E). Conducted research indicated that weather conditions had a significant impact on the final quantity of maize grain obtained. Yields oscillated from 4.31 t·ha^-1 in 2006 to 8.33 t·ha^-1 in 2007. Rainfall shortage in the growing seasons 2005 (72% of multi-year average) and 2006 (64% of multi-year average) and also high temperatures at the time of blooming (July 2005 – 21,6°C, July 2006 – 25,4°C, with a multi-year average of 19,1°C) caused a considerable (above 15%) yield decrease and infestation of Ustilago maydis. As the prices of means of production haven't changed significantly throughout the analyzed period, the profitability of maize growing depended on the quantity of yield and the price of grain purchase and oscillated from 56 zł to 380 PLN per ton. Composition of cost and income for maize grown for grain on the area unit has shown that in 2006 the farm paid extra 286.9 PLN for every hectare of maize grown. Profitability of 3165.9 PLN from hectare of maize grown for grain was a result of higher yields and a good purchasing price per ton of grain in 2007.

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