This document discusses NutrientStar, a program that aims to provide objective assessments of fertilizer management tools and products. It was created in 2014 by the Environmental Defense Fund to optimize fertilizer use. NutrientStar evaluates tools on nutrient use efficiency and shares results to educate farmers on science-based options. Its goals are to measure tool performance, highlight the importance of research, and increase transparency around optimizing fertilizer delivery. It also outlines some initial findings from evaluations of products like Adapt-N and Encirca.