All Science Fair Projects

Over 1000 FREE Science Fair Project Ideas!

Topics  > Biology > Botany

Effect of fertilizer on plant growthFeatured science projectScience project video


The materials required for this science fair project:

-    1 packet of radish seeds

-    15 plastic pots

-    Soil required for  15 pots

-    Hasta Gro fertilizer

-    Tap water

-    Ruler (1 meter)

-    5 plastic containers

-    1 measurement cup


1.    For this experiment, the independent variable is the concentration of fertilizer in the water. The dependent variable is the growth of the radish plant. This is determined by measuring the average height of the 3 plants in each group and calculating the average height. The constants (control variables) are the amount of water  and the type of plant used.

2.    The 15 pots are filled with the same amount of soil. One radish seed is placed in each pot. (More than one radish seed can be used in each pot in case some of the seeds do not germinate. Once they start to geminate, remove the unwanted plants from the pot)

3.    The pots are divided into 5 groups with 3 plants in each group. They are labeled as group A, group B, group C, group D and group E. The pots are watered 2 times a day according to the concentrations recommended below.

a.    Group A plants are watered using 33% of recommended concentration of fertilizers

b.    Group B plants are watered using 66% of recommended concentration of fertilizers

c.    Group C plants are watered using 100% of recommended concentration of fertilizers

d.    Group D plants are watered using 133% of recommended concentration of fertilizers

e.    Group E plants are watered using 166% of recommended concentration of fertilizers

4.    The height of the plants is measured on the 10th day and the average is calculated for each group.

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 to prepare, 10 days for observation
Material availability:
1 day to prepare, 10 days for observation
Safety concerns:

Some fertilizers react to solvents - perform the experiment in a well ventilated place and add the fertilizer slowly.