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The effect of nitrate levels in water on the growth of plantsFeatured science projectScience project video


The materials required for this science project experiment:
- 1 packet of mung beans
- 6 pots
- Soil required for the 6 pots
- Nitrate fertilizer
- Tap water
- 6 beakers
- 1 digital weighing machine
- Ruler (1 meter)


1. For this science fair project, the independent variable is the concentration of nitrates in the water. The dependent variable is the growth of the beans. 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, the amount of sunlight and the type of plant used.

2. The 6 pots are filled with the same amount of soil. Three mung beans are placed in each pot. (More than 3 mung beans 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 6 pots and 6 beakers are labeled as A to F. Nitrate solutions are mixed in the beakers according to the ratios mentioned below,

a. Beaker A will contain only tap water

b. Beaker B will contain 0.1 gram of nitrate with 100ml water (0.1%)

c. Beaker C will contain 0.2 gram of nitrate with 100ml water (0.2%)

d. Beaker D will contain 0.3 gram of nitrate with 100ml water (0.3%)

e. Beaker E will contain 0.4 gram of nitrate with 100ml water (0.4%)

f. Beaker F will contain 0.5 gram of nitrate with 100ml water (0.5%)

4. The beans are watered as mentioned above and observed for 10 days. Thier average height is measured every 2 days and recorded in the table below.

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Complexity level:
Project cost ($):
Time required:
1 day to prepare, 10 days for the science project experiment
Material availability:
May be purchased at a plant nursery
Safety concerns:

Basic safety requirements