Question

How does the soil become too acidic in nature?

Answer 1

Soil becomes acidic due to continuous use of fertilizers  due to accumulation of industrial effluents on land and also due to decomposition of organic wastes.We can decrease the acidic nature of soil by adding slaked lime

Answer 2

There are four major reasons for soils to become acidic: rainfall and leaching, acidic parent material, organic matter decay, and harvest of high-yielding crops. ... Organic matter decay produces hydrogen ions (H+), which are responsible for acidity (an ion is a positively or negatively charged element)