The researchers studied how different sowing dates affect the growth and yield of a wheat variety called Zhengmai 7698. They found that delaying the sowing date led to shorter plants with fewer leaves. The later the seeds were planted, the fewer ears and lower yield the wheat produced. By analyzing the data, they determined that the best sowing dates for Zhengmai 7698 are between October 10th and 15th. This timing helps the wheat plants grow well, leading to a more balanced population and higher economic production.