The following represents the year-end report of the second year of a three-year project to evaluate the use of controlled fertilization for enhancement of waterfowl production in acidified wetlands. The background and objectives of the study, and a description of the morphology, physics, chemistry and biology of the study sites, have been presented in the first year-end report and are not repeated here. This report concentrates on describing the response of the experimental sites to the addition of fertilizer based on comparisons between pre and post fertilization years and control and experimental sites.