pH of soils can be controlled by:

Addition of dead organic matter.

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Addition of calcium oxide or calcium hydroxide.

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Both a and b

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Addition of salt.

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Solution

The correct options are
A Addition of dead organic matter.
B Addition of calcium oxide or calcium hydroxide.
C Both a and b
The acidity of soils can be neutralised by 'liming the soil' by adding calcium hydroxide or calcium oxide.

Similarly, the soil with an excess of limestone is usually alkaline and can be neutralised by adding some decayed organic matter which is acidic in nature.

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