This project will support implementation of the “kNow your Nitrates” design challenge activity that takes a solutions-focused approach to understanding the nitrate cycle and agricultural pollution. In this activity, participants will consider variables such as crop variety and location, amount of fertilizer to apply, and geographic variables to design an effective strategy to maximize crop yield and minimize groundwater pollution. This activity will emphasize measurement and assessment of the design by the participants, through water quality testing and evaluating total crop yield at the end of every simulation. Graduate student volunteers in 20 science booster clubs nationwide will be well trained in both content knowledge and effective interpretation of the activity and empowered to facilitate it in various science outreach outlets. NCSE’s science booster clubs will offer this activity in agriculture-focused states and regions where understanding of the science of fertilizers may be limited Provide programming that is flexible to age and background, to increase diversity in participation.