Residue decay prediction is important for planning how to manage crop leftovers effectively. Researchers studied how soybean, corn, sunflower, and wheat residues break down in real fields. After 10 months, soybean lost 74%, corn 71%, sunflower 61%, and wheat 36% of their mass. Factors like temperature, moisture, and the initial carbon/nitrogen ratio of the residue affected how fast they decomposed. The data collected helped confirm a model for predicting residue decay.