A study on cowpea plants in the F2 generation found that certain traits like days to first flowering, number of pods per plant, and seed weight have a strong positive impact on seed yield. The researchers grew different genotypes of cowpea and observed how these traits were related to the final seed production. They discovered that some specific characteristics directly influence the amount of seeds produced by each plant. This information can help farmers choose the best cowpea varieties to maximize their crop yield.