Under what soil condition do you think a farmer would treat the soil of his fields with quicklime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?

Quicklime, slaked lime and chalk are basic in nature. When they react with acids, neutralization reaction takes place. If the soil is too acidic and not good for cultivation, then to neutralize the acidity of soil, the farmer would treat the soil with these substances.