What is the effect of manufactured fertilizers on soil as compared to natural compost? Objective Students will analyze the impact of natural v. manufactured fertilizers on soil health. Background This is lesson three of five lessons in the George Washington Carver - An Original Conservationist unit. To analyze the benefits of compost, students will begin by creating compost in a bottle. Next, they will choose one of the options listed below. The goal of this project is for you students to “sell” their fake product, either fertilizer or compost, to a consumer. You will need to assign your group Duration: 90 Minutes.