What is the recommended phosphorus application for soybeans in Illinois?

The recommended phosphorus application for soybeans in Illinois is based on soil test results, which is why the correct answer includes the range of 40-60 lbs P2O5 per acre. Soil testing is crucial because it helps determine the existing phosphorus levels in the soil, allowing for precise nutrient management. This practice ensures that soybeans receive the optimal amount of phosphorus they need for healthy growth and development, while also preventing over-application that could lead to nutrient runoff and environmental concerns.

By relying on soil test results, farmers can tailor their phosphorus application to match the specific nutrient requirements of their soil and the expected yield, thereby enhancing efficiency and promoting sustainable agricultural practices. Recommendations that rely on flat rates or ignore soil conditions do not allow for such precise management and can negatively impact both crop yields and environmental health.