The Nutrient module includes the ability to input the following information: 

• Nitrogen Total Loss 
• Nitrogen Load Loss 
• Nitrogen Conversion Efficiency 
• Nitrogen Purchased Surplus 
• Phosphorous Total Loss 
• Phosphorous Load Loss 

These can be taken from your Overseer report, or similar, and stored in the tool. Multiple years of data can be stored in this way. Just add the data annually and hit Save.