Soybean yield is influenced by planting date, cultivar, seed treatment, and seeding rate. A study in South Dakota from 2014 to 2016 showed that delayed planting decreased seed yield and quality, with earlier planting being more beneficial. Higher seeding rates led to lower stand establishment. Seed treatment increased yield regardless of planting date. Seed protein varied with planting dates and maturity groups, while seed oil decreased with delayed planting. Overall, early planting is crucial for maximizing soybean yield and quality, regardless of the soybean variety used.