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Examining the effect of watering on plant growthFeatured science projectScience project video


Materials required for this science fair project:

-    1 packet of radish seeds
-    10 small plastic pots
-    Soil required to fill the 10 pots
-    Tap water
-    1 measuring cylinder
-    Ruler (1 meter)
-    1 marker


1.    The independent variable in this science fair project is the amount of water used every day– 20ml, 40ml, 60ml, 80ml and 100ml once a day or twice a day. The dependent variable is the height of the mung bean sprouts, which is determined by measuring the average height of the plants in each test group. The constants (control variables) are the environment that the plants are kept in (temperature, humidity, light, etc), the species of plant used, the size of the pot and the type of soil.

2.    Fill the ten pots with the same amount of soil , and place ten mung beans in each pot. (More than ten mung beans seeds can be placed in each pot to act as backup in case some of the beans do not germinate. Remove any unwanted plants once germination has occurred).

3.    Use the marker to label the ten pots as “once” or “twice”, followed by one of the following measurement: 20 ml, 40 ml, 60 ml, 80 ml or 100 ml.

4.    Water the pots labeled “once”  once a day, and the pots labeled “twice” two times a day, using the amount of water indicated on the pot. Repeat this procedure for the next ten days.

5.    Measure the heights of the plants on the 10th day. Calculate the average height of the radish plants in each pot by totaling the heights and dividing it by the number of plants. Record the average height in the table given below.

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Complexity level:
Project cost ($):
Time required:
Preparation will take approximately one day, while observation and recording of data will require ten days
Material availability:
Easily found
Safety concerns:

Basic safety requirements