Glencoe Earth Science

Unit 6: You and the Environment

Legumes Fix Nitrogen

Project Type: Technology
Have students conduct research to identify how peanuts and other legumes “fix” nitrogen. Students then develop a flow chart about nitrogen fixation. They may also design a plan for farmers to select crops and a crop rotation system for different types of soil.

Design a flow chart about nitrogen fixation to include:

  • Nitrogen fixing legumes and their bacteria
  • Atmospheric nitrogen
  • Fixed nitrogen
Write 1-2 page(s) on why crop rotation keeps farm land more productive

Design for farmers to include:

  • Three crop types
  • Three crop rotation systems
  • Three soil types

The following are site to help student understand the nitrogen cycle and research crop rotation. Students may use these and or any other site they find.

Nitrogen Cycle

Nitrogen Fixation

Type in “nitrogen cycle” or “crop rotation”

Crop Rotation

Crop Rotations for Increased Productivity

Type in “crop rotation”


Click here for a rubric to help you score this project. (69.0K)

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