The researchers studied different sorghum hybrids to see which ones had the best grain yield and traits related to it. They found that the hybrid CSV 15 x SPV 1521 had the highest grain yield, with significant improvements over the parent plants. This hybrid also did well in terms of flowering time, plant height, number of grains per panicle, and grain yield per plant. The study showed that the traits were influenced by a mix of genes from both parent plants, rather than just one type of gene.