Effect of water hardness on seed germination
The hypothesis that watering plants with soft water will help seeds germinate more quickly, is proven to be false.
Water hardness is however, very important for the survival of fish and other aquatic life. The calcium diluted in the water can be absorbed by the fish for bone formation, metabolism and blood clots. The presence of calcium or other minerals in the water also helps in preventing the loss of important minerals like sodium or potassium from the fish’s body fluids.
This science fair project may be repeated, this time, with different types of plants like marigold or radish seeds?
Modify the science project experiment, using different environments like placing them under the sun, in a shaded area or indoors.
How to water plants - http://home.howstuffworks.com/how-to-water-plants.htm
Water softening - http://en.wikipedia.org/wiki/Water_softening
Understanding water hardness -http://www.cauky.edu/wkrec/Hardness.htm
Basic safety requirements