Authored by subject matter experts. Content strictly validated against latest NCERT rationalized curriculum and official Board Marking Schemes.
📑 In This Chapter Guide (Table of Contents)
1. Resource Classification & Sustainable Development
Everything available in our environment which can be used to satisfy human needs, provided it is technologically accessible, economically feasible, and culturally acceptable, is termed a Resource.
Sustainable Development: Development that meets the needs of the present generation without compromising the ability of future generations to meet their own needs, while avoiding environmental destruction.
Rio de Janeiro Earth Summit (1992): Convened in Brazil by the United Nations to address global environmental protection and socio-economic development. It adopted Agenda 21, urging local governments to frame local environmental sustainability blueprints.
2. Major Soil Types of India & Their Agricultural Value
| Soil Classification | Major Geographical Regions | Mineral & Chemical Characteristics | Principal Crops |
|---|---|---|---|
| Alluvial Soil (Most widespread ~40%) | Northern plains (Indus, Ganga, Brahmaputra basins), coastal deltas of Mahanadi, Godavari, Krishna, Kaveri. | Rich in potash, phosphoric acid, and lime; deficient in nitrogen. Divided into old alluvial (Bhangar, higher kankar nodules) and new alluvial (Khadar, more fertile). | Sugarcane, paddy (rice), wheat, pulses, and oilseeds. |
| Black Soil (Regur Soil) | Deccan trap (basalt) region: Maharashtra, Saurashtra, Malwa, Madhya Pradesh, Chhattisgarh. | Extremely fine clayey material; high moisture retention capacity. Develops deep cracks during dry summer (self-aeration); sticky when wet. Rich in calcium carbonate, magnesium, potash. | Ideal for growing Cotton (Black Cotton Soil), tobacco, and citrus fruits. |
| Red and Yellow Soil | Low rainfall zones of eastern and southern Deccan plateau, Odisha, and Western Ghats. | Develops reddish color due to diffusion of iron in crystalline and metamorphic rocks; looks yellow in hydrated form. | Millets, groundnut, pulses, and maize. |
| Laterite Soil | High temperature and heavy rainfall areas: Western Ghats, Karnataka, Kerala, Tamil Nadu, Assam hills. | Formed by intense leaching due to heavy rains. Low humus content because microorganisms are destroyed by high heat. Acidic in nature. | Tea, coffee, and Cashew nut (Red laterite soil). |
3. Land Degradation Causes & Conservation Strategies
Human activities causing severe land degradation across India:
- Mining & Quarrying: Leaves deep scars and abandoned open-cast pits in Jharkhand, Chhattisgarh, and Madhya Pradesh.
- Overgrazing: Destroys grass cover in Gujarat, Rajasthan, and Maharashtra.
- Over-irrigation: Causes waterlogging leading to increased salinity and alkalinity in Punjab, Haryana, and Western UP.
- Industrial Effluents: Toxic chemical discharges degrade surrounding soil and groundwater table.
Proven Conservation Methods: Afforestation, controlled grazing, shelterbelts along desert fringes (sand dune stabilization), terrace cultivation in hilly regions, and contour ploughing to impede surface water runoff.
💡 Frequently Asked Questions (FAQ)
❓ Differentiate between Bhangar and Khadar alluvial soils.
Bhangar is old alluvial soil deposited away from river floodplains; it has high concentrations of kankar (calcareous nodules) and is comparatively less fertile. Khadar is new alluvial soil deposited by annual river floods; it has finer particles, is renewed every year, and is extremely fertile.
❓ What are the three steps involved in Resource Planning in India?
(1) Identification and inventory of resources across the country via surveying, mapping, and qualitative/quantitative measurement; (2) Evolving a planning structure endowed with appropriate technology, skill, and institutional setup; (3) Matching the resource development plans with overall national development plans.
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