Aftermarket John Deere concaves by Estes Performance Concaves are an excellent investment for farmers looking to improve their crop harvesting. Their high-quality steel concaves are designed to fit John Deere and Case IH combines and improve threshing and separation for a range of crops, including soybeans. Farmers should also consider using cereal rye as a cover crop for soybean rotation and ensuring their crop has adequate nutrients and moisture. Harvesting soybeans at the right time and moisture level is also crucial for maximizing yield and efficiency.