Soil acidity is very important.

Factors which may change soil pH:

  • Use of ammonium fertiliers --> More acid soil
  • Acid rain --> More acid soil
  • Vegetation rotting --> More acid soil

This acidity can be removed by adding crushed limestone (crushed to improve surface area, and therefore rate of reaction)

  • Calcium hydroxide and calcium oxide are also used to make soil more basic, however as this is soluble, it will make the soil basic
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