A Lemon Tree and an Experiment

The leaves on our lemon tree have been turning yellow and it only had a handful of lemons on it this past year. I have fertilized and given it extra minerals including magnesium. Now it is finally turning around. My tree book says that sometimes the nutrients are in the soil but the tree cannot use them because the soil is too alkaline. I got a little book from the library that has a children's experiment for determining soil pH. This is the experiment:

Boil chopped red cabbage. Strain it and let it cool. Mix the purple liquid in a jar with the soil. Allow soil to settle in the jar then check the color of the liquid. Pink is acidic. Blue, green or yellow is alkaline. Purple is neutral.

We checked the pH of lemons, soap, baking soda, and vinegar. The girls had a great time and used lots of towels. Of course, I still don't know if my soil is too alkaline or not.

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