Experiment 5

Which soil makes beets and radishes grow best?



  • Beet and radish seeds
  • Sand
  • Soil
  • Compost
  • Time-release fertilizer (Follow directions on the package.)
  • 8 Styrofoam cups

Do this first:


    Fill the cups with the potting mixes. Make two cups of each type of soil. Plant 2 beet or radish seeds in each.

    Fertilize one cup each of the different potting mixes.

    Place the cups on a sunny window sill and add 2 teaspoons of water to each cup daily.


Record your results. Which plant sprouts fastest? Which grows fastest?






Where does timed-release fertilizer come from?


Which takes more energy to produce: compost or chemical fertilizer?

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