The study looked at how changing the number of plants and spacing between rows affects maize grain yield. They tested different plant densities and row spacings over two years and found that the optimal plant density varied depending on the year. In 2013, higher plant densities led to higher yields, but in 2014, lower plant densities were more favorable. The weather conditions in April-May and June also played a role in the yield amounts. Overall, the study showed that adjusting plant density and row spacing can impact maize yield, with different results depending on the specific conditions of each year.