The term 'Regur' is used to mean;
Black cotton soil
Understanding the Term 'Regur' in Soil Classification
The question asks about the meaning of the term 'Regur'. This term is commonly used in India to refer to a specific type of soil. Understanding the characteristics of different soil types is important in geography and environmental studies.
Identifying Regur Soil
The term 'Regur' is primarily associated with one particular soil type known for its unique properties, especially its suitability for cultivating certain crops.
Let's look at the options provided:
- Laterite soil
- Deltaic soil
- Red soil
- Black cotton soil
Among these options, 'Regur' is the local name given to 'Black cotton soil'. These soils are also known as Black soils.
Characteristics of Black Cotton Soil (Regur Soil)
Black cotton soils are dark in colour and are derived from volcanic rocks. They are spread over large areas of the Deccan Plateau in India. Key characteristics include:
- Colour: Typically black or dark grey.
- Composition: Rich in clay minerals, especially montmorillonite, which causes them to swell when wet and shrink when dry.
- Texture: Clayey, making them sticky when wet and prone to deep cracks when dry.
- Nutrient Content: Generally rich in lime, iron, magnesia, and alumina, and also contain potash. However, they are often deficient in phosphorus, nitrogen, and organic matter.
- Water Retention: Have a high capacity to retain moisture, which is beneficial for agriculture, especially in areas with limited irrigation.
- Formation: Believed to have been formed due to the weathering of basaltic rock.
- Crops: Highly suitable for growing cotton (hence the name), sugarcane, jowar, wheat, and oilseeds.
The name 'Regur' is widely used, particularly in the southern parts of India, to refer to this distinctive soil type.
Comparing with Other Soil Types
To further clarify why 'Regur' refers to black cotton soil, let's briefly touch upon the other options:
- Laterite Soil: Formed under conditions of high temperature and heavy rainfall, leading to leaching of bases and silica. They are often reddish in colour and are found in the Western Ghats, Eastern Ghats, and other parts of India.
- Deltaic Soil: These are alluvial soils found in river deltas, formed by the deposition of silt, sand, and clay carried by rivers. They are generally fertile and suitable for agriculture.
- Red Soil: Developed on crystalline igneous rocks in areas of low rainfall. Their colour is due to the presence of iron oxides. They are generally less fertile than alluvial or black soils and require irrigation and fertilizers for cultivation.
Based on the established terminology and characteristics, 'Regur' is synonymous with 'Black cotton soil'.
| Soil Type | Key Characteristics | Associated Term |
|---|---|---|
| Black Cotton Soil | Dark colour, clayey, swells when wet, shrinks & cracks when dry, high moisture retention. | Regur |
| Laterite Soil | Reddish, leached, found in high rain/temp areas. | N/A |
| Deltaic Soil | Alluvial, found in river deltas, fertile. | N/A |
| Red Soil | Reddish due to iron oxides, less fertile, developed on crystalline rocks. | N/A |
Therefore, the term 'Regur' is used to mean Black cotton soil.
Revision Table: Soil Types and Characteristics
| Soil Type | Common Name / Term | Formation | Key Feature | Typical Location (India) |
|---|---|---|---|---|
| Black Soil | Regur Soil, Black Cotton Soil | Weathering of basaltic rock | High clay content, swells/shrinks, retains moisture well | Deccan Plateau, Maharashtra, Gujarat, Madhya Pradesh |
| Alluvial Soil | - | Deposition by rivers | Highly fertile, varies in texture (sandy to clayey) | Northern Plains, River Valleys, Deltas |
| Red Soil | - | Weathering of crystalline igneous rocks | Reddish colour (iron oxides), permeable | Eastern & Southern Deccan, parts of Odisha, Chhattisgarh |
| Laterite Soil | - | Intense leaching under high rain/temp | Hardens on drying, poor fertility (generally) | Western Ghats, Eastern Ghats, North-Eastern India |
Additional Information: Importance of Regur Soil
Regur soil, or black cotton soil, is economically very important in India due to its fertility and moisture-retaining capacity, which supports the cultivation of cotton and other crops crucial for the economy. Its self-ploughing characteristic (cracking when dry) helps in aeration. However, farming these soils can be challenging due to their stickiness when wet, making ploughing difficult during the monsoon season.
Important Questions from Soils
Which of the following statements regarding Regur soil is/are correct?
1. It is a light coloured, clayey and fertile soil.
2. It is developed on Deccan basaltic lava under hot and humid conditions.
3. Cotton is extensively cultivated in this soil.
Select the answer using the code given below:
Which one of the following soils is ideal for growing cotton?
Which one of the following is an organic soil?
Which of the following statements about black soil is INCORRECT?
Fertile riverine alluvial soil is best suited for producing ________.
