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Soil fertility and conductivityFeatured science projectScience project video

Conclusion

The hypothesis that loam soil with fertilizer added will have the highest electrical conductivity has been proven to be true.

The measurements of soil conductivity will only provide some hints as to the amount of minerals present in the soil. It cannot identify the types of minerals that are present. There are many types of conductivity meters available in the market today that are able to measure soil conductivity.

Also consider

The science fair project may be repeated by adding different types of minerals to the soil samples and subsequently comparing their electrical conductivity.

The experiment may also be modified to measure the effects of other factors on electrical conductivity, eg. by varying the amount of water added, the temperature of the environment, or the pH of the soil.
 

References

How to measure soil conductivity? - http://www.ehow.com/how_5901417_measure-soil-conductivity.html

From the soil up – conductivity - http://www.fromthesoilup.com.au/soil/conductivity

Testing the soil conductivity - http://www.eutechinst.com/techtips/tech-tips22.htm
 

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Complexity level:
5
Project cost ($):
30
Time required:
6 hours for preparation, 1 hour to conduct this science project experiment
Material availability:
Easily found at a hobby store
Safety concerns:

None