The article discusses the different types of soil found in India and how they have been classified over time. The National Bureau of Soil Survey and Land Use Planning in Nagpur has been studying soil for 50 years, creating maps that show where different soil types are located. They found that factors like climate, vegetation, and topography have influenced the formation of various soil types in India. The researchers suggest that India should have its own system of soil classification to better understand and compare soils internationally.