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Improve your garden or study the effects of soil nutrients on plant growth! This kit lets you test soil for pH, nitrogen, phosphorous, and potassium. Perform the 4 easy color comparison tests 10 times each. Rapitest.
The following questions might help you come up with a good environmental science fair project: What pH and chemical levels are most common in your area? How do garden soils with different amounts of nitrogen, phosphorous, potash, or pH compare?