Science Buddies: "Ask an Expert"

Hello,

I had a question on the Feeding Earthworms project. In the article it mentions using the Soil test kit that tests pH, nitrogen, phosphorus, and potassium. The problem is the data that is shown on these kits is shown as N0, N1, N2, P0, P1, P2, etc. The problem is what measurement am I using for this, how can I translate this into another form of data that is quantifiable?

Thanks,
Kaleb Taddesse.

[Project: https://www.sciencebuddies.org/science- ... il-quality ]