请优化这段文献描述：Con and Opt contributed 923 and 661 of the yield variation in thousand kernel weight respectively while Min’s ear number accounted for 607 of the yield variation

In terms of yield variation, Con and Opt had the highest contributions of 92.3% and 66.1%, respectively, to the thousand kernel weight. Meanwhile, Min's ear number accounted for 60.7% of the yield variation.