Quick and Dirty method - Vinegar: Take a sample of dry dirt (about 1/4 cup), mix with distilled water to make a liquid “mud” and then start pouring household vinegar over top. If the mixture fizzes, it’s alkaline. Baking soda: Mix dry dirt and distilled water as above then start sprinkling baking soda over top. If the mixture bubbles, it’s acidic. If neither test produces a reaction, you have fairly neutral soil.
enough to heat a greenhouse
Tomatoes need calcium to achieve their full flavor potential, and calcium is often greatly lacking in our soils. 95% of a dry eggshell is calcium carbonate. When planting your tomato plants crush up (to powder) about 4 or 5 egg shells and put them in the bottom of the hole. Then plant your tomato on top. Theyll provide calcium and prevent blossom end rot.