Hasta Gro fertilizer (or any other brand of organic fertilizer)
Ruler (1 meter)
3 watering cans
For this experiment, the independent variable is the composition of the water used to water the plants (ie: organic fertilizer, tap water and mineral water). The dependent variable is the rate of growth of the bean plants. This is determined by measuring the average height of the 3 plants in each group. The constants (control variables) are the amount of water used and the type of plant used, as well as the amount of sunlight and temperature conditions.
The 9 pots are filled with the same amount of soil. A mung bean is placed in each pot.
Prepare 1 liter of each kind of watering solution and fill the 3 watering cans accordingly. Label them clearly:
Tap water with Hasta Gro
The pots are divided into 3 groups with 3 pots in each group. They are labeled as group A, group B and group C.
Group A plants are watered with tap water mixed with Hasta Gro fertilizer as indicated in the instructions.
Group B plants are watered with tap water.
Group C plants are watered with mineral water
The bean plants are watered as mentioned above and observed for 5 days. Their height is measured everyday and recorded in the table below.