The researchers conducted a field experiment to study the effects of different levels of phosphorus fertilization on maize yields in the Potkozarje area. They used four different rates of phosphorus fertilization and observed that maize grain yields increased by up to 32% and 17% compared to the control in 2004 and 2005, respectively. The weather conditions in 2005 were characterized by excess precipitation, leading to a delay in maize maturity by about twenty days. Overall, the study showed that phosphorus fertilization can significantly improve maize yields in favorable growing seasons.