Sowing wheat early and reducing planting density can help weak-springness wheat varieties in the Huang-Huai area grow bigger grains. The study found that as the days after flowering increased, the weight of the grains increased in a specific pattern, reaching a peak on the 20th day after flowering. By adjusting the sowing date and planting density, farmers can improve the grain-filling rate and increase the weight of the grains for this particular wheat variety.