All Science Fair Projects

Over 1000 FREE Science Fair Project Ideas!

Hydroponics vs. soil growth Featured science projectScience project video


The materials required for this science fair project are:

-    1 Peperomia plant
-    10 plastic containers
-    5 plastic containers filled with soil
-    1 bottle of hydroponic plant food
-    1 pair of scissors
-    Tap water
-    1 ruler
-    1 black marker pen


1.    The independent variable in this science fair project is the method of cultivation – whether the plant is grown in soil, or hydroponically. . The dependent variable is the length of the plant’s roots after 3 weeks. This is determined by measuring the length of the roots using  a ruler. The constants (control variables) are the amount of soil or nutrient solution, the type of plant, the length of the stem, the length of time allocated for the experiment and the amount of sunlight received by the plants.

2.    Cut 10 pieces of the  Peperomia plant stem into  8 cm lengths.

3.    Label the 5  plastic containers “soil 1” to “soil 5”. Label the other  5 plastic containers  “hydro 1” to “hydro 5”.

4.    Make 3 holes  at the bottom of the plastic containers marked “soil 1” to “soil 5”. Fill these containers  with  soil. Plant 1 Peperomia plant stem  in each of the container. Water the containers daily with  50ml of water.

5.    Mix the hydroponics plant nutrient is with water according to the instructions stated on the packaging. Pour the mixture into the  plastic containers marked “hydro 1” to “hydro 5”. Place 1 Peperomia plant stem  in each of the container.

6.    Place the 10 plastic containers at a place where there is adequate sunlight.

7.    Remove the plant stems from their respective containers after 3 weeks,. Measure the length of their roots  Record the measurements in the table  provided below.

See our all-time most popular science projects
Search science fair projects Browse science fair projects
popular science fair projects
Complexity level:
Project cost ($):
Time required:
1 day for preparation 21 days for observation
Material availability:
May be found at a nursery
Safety concerns:

Basic safety requirements