The study looked at how returning wheat straw to corn fields affects soil nutrients and crop yield. By comparing fields where wheat straw was returned to those where it wasn't, researchers found that returning wheat straw increased soil nutrient levels, leading to higher corn yields. On average, returning wheat straw resulted in a 12.09% increase in yield, with each ear of corn weighing more. This suggests that using wheat straw as a soil amendment can improve crop growth and increase harvest yields.