Site gives a fairly high level breakdown of the general contents of a fertilizer (the Nitrogen, Phosphorus, Potassium, and Sulfur content) and what that does for soil.

Discusses what phosphates are, their role in the phosphorous cycle, where they occur in the natural world, their chemistry, and the impact of the use of phosphate fertilizers in agriculture.

Through videos, interactive activities, and readings, students explore the future of food production and sustainability of our current agricultural system.