System fertilization can be a good way to help soybean crops grow better. In this study, researchers looked at how to use fertilizer for black oat-soybean crops in fertile soil with no-tillage. They tested different ways of applying fertilizer and different levels of it. They found that giving more fertilizer to black oats made them grow more. Anticipating fertilizer in black oats worked best. More fertilizer led to more phosphorus and potassium in the plants. Nitrogen levels were highest at 200% fertilizer, then dropped at 300%. The way fertilizer was managed didn't affect soybean yield. So, using system fertilization can help black oats grow well and support soybean growth too.