Science Fair Projects World

Investigating Microbial Life in Different Soil Types




Study the microbial communities present in different soil types.


  • Soil samples (clay, sand, loam)
  • Petri dishes
  • Agar
  • Sterile swabs
  • Microscope
  • Notebook for observations


  1. Collect soil samples from different locations, ensuring they are of different types (e.g., clay, sand, loam).
  2. Prepare Petri dishes with agar.
  3. Use sterile swabs to collect a small amount of soil from each sample.
  4. Streak the swab onto the agar in separate Petri dishes.
  5. Incubate the Petri dishes at room temperature for several days.
  6. Observe the growth of microbial colonies using a microscope.
  7. Record the types and quantities of microbes observed in each dish in a notebook.
  8. Compare the microbial communities in different soil types and draw conclusions about soil biodiversity.