Intended to supplement a regular program, this pamphlet provides background information, related activities, and suggestions for other activities on the subject of nitrate as a water pollutant. Two activities related to plant nutrient pollution, nitrate filtration and measuring mitrate used by plants, are explained in detail, outlining objectives, materials required, procedure, and questions. The third part of this Science Study Aid describes a technique for measuring the amount of nitrate in water, and the amount necessary to carry out the two activities. A vocabulary list and bibliography are included together with diagrams and space for taking notes. (BL)