Here's a breakdown:
To increase acidity (lower pH):
* Elemental sulfur: This is a common and effective option, but it acts slowly.
* Aluminum sulfate: This is faster-acting than sulfur but can be more expensive.
* Iron sulfate: Similar to aluminum sulfate, it works quickly but can be costly.
To decrease acidity (raise pH):
* Limestone (calcium carbonate): This is the most common and cost-effective option.
* Dolomitic limestone (calcium and magnesium carbonate): Similar to limestone but also provides magnesium.
* Wood ash: A good source of calcium and potassium, but its effectiveness varies depending on the type of wood.
* Hydrated lime (calcium hydroxide): This is faster-acting than limestone but can be more caustic.
Important considerations:
* Soil type: Different soil types react differently to amendments.
* Desired pH: The target pH will determine the amount of amendment needed.
* Plant needs: Different plants have different pH preferences.
It's always recommended to test your soil pH and consult with a local agricultural extension office or a qualified soil scientist for personalized recommendations on which compound and how much to use.
