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Bacteria Can Fix It! A Comparison of Nitrogen-Fixing Bacteria and Nitrogen Fertilizers

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In this Science Buddies science fair project, you will compare two nitrogen delivery systems for plants. You can customize this kit to include the clover seeds, Rhizobium inoculum, soil test kit, and other supplies needed to complete this experiment.

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In this experiment, you will grow clover plants in soil with no nitrogen added, in soil with nitrogen fertilizer added, and in soil containing nitrogen-fixing bacteria (in this case, a species of rhizobia called Rhizobium legominosarium, or R. legominosarium). You will monitor the nitrogen levels in each type of soil using a nitrogen testing kit. You will observe the effects of nitrogen on the health of the clover plants by measuring the increase in biomass of each plant during the experiment.

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