The classification of agricultural regions in India is primarily based on the distribution of rainfall, soil types, and temperature regimes. While various scholars like Dr. M.S. Randhawa have provided detailed classifications, the most widely accepted frameworks for the Indian Economy (UPSC) are based on the Agro-Climatic Zones (ACZ) and the Crop-Based Regions.
1. The Rice-Jute-Tea Region
This region primarily covers the humid and sub-humid parts of East and North-East India.
- Geographical Coverage: Assam, West Bengal, Odisha, Bihar, Jharkhand, and the Chhattisgarh plains.
- Key Crops: Rice is the dominant food crop; Jute is the primary fiber crop (specifically in the Ganga-Brahmaputra delta); Tea is grown in the undulating hilly terrains of Assam and North Bengal.
- Climate: High rainfall (above 150 cm) and high humidity.
- Trivia: The “Aman, Aus, and Boro” varieties of rice are specific to the West Bengal and Odisha deltaic regions.
2. The Wheat-Sugarcane Region
This region corresponds to the fertile alluvial plains of North-West and North-Central India, largely influenced by the Green Revolution.
- Geographical Coverage: Punjab, Haryana, Western Uttar Pradesh, and parts of Delhi and Rajasthan.
- Key Crops: Wheat (Rabi), Sugarcane (Cash crop), Mustard, and Maize.
- Features: Intensive farming with heavy reliance on canal and tube-well irrigation.
- Economic Impact: This region is the primary contributor to the Central Pool of food grains managed by the Food Corporation of India (FCI).
3. The Cotton-Jowar (Black Soil) Region
Also known as the Regur Soil Region, it is characterized by the Deccan Trap topography.
- Geographical Coverage: Maharashtra, Gujarat, Madhya Pradesh, and parts of Karnataka.
- Key Crops: Cotton (long and medium staple), Jowar, Tur (Arhar), and Soyabean.
- Features: Dominated by rain-fed agriculture. Gujarat and Maharashtra are the leading producers of cotton in India.
- Fact: The black soil’s “self-ploughing” nature and high moisture-retention capacity make it ideal for cotton cultivation during the Kharif season.
4. The Millets-Oilseeds Region
This region spans the semi-arid tracts where rainfall is insufficient for rice or wheat.
- Geographical Coverage: Parts of Rajasthan, Gujarat, Karnataka, and Andhra Pradesh.
- Key Crops: Bajra, Jowar, Ragi (finger millet), Groundnut, and Castor.
- Significance: With the declaration of 2023 as the International Year of Millets, these “Nutri-cereals” have gained immense economic and nutritional importance.
5. The Maize-Coarse Grains Region
Primarily located in the interior plateaus and hilly terrains.
- Geographical Coverage: Mewar Plateau (Rajasthan), parts of Madhya Pradesh, and the Himalayan foothills.
- Key Crops: Maize, small millets, and pulses.
- Trivia: Maize is increasingly used as a feedstock for the Ethanol Blending Program (EBP) in the Indian energy economy.
6. The Plantation Crops and Spices Region
Located in the tropical humid regions with distinct topographical variations.
- Geographical Coverage: Kerala, Tamil Nadu, Karnataka (Western Ghats), and parts of the Nilgiri Hills.
- Key Crops: Rubber, Coffee, Tea, Spices (Pepper, Cardamom), and Coconut.
- Fact: Karnataka is the leading producer of Coffee in India (specifically Arabica and Robusta varieties).
7. The Fruit and Vegetable Region
While scattered across the country, certain belts are designated based on specialized horticultural production.
- Geographical Coverage: Himalayan belt (Apples), Western Ghats (Citrus), and North-East India (Pineapple).
- Key Crops: Mangoes (Ratnagiri), Apples (Himachal/J&K), Grapes (Nashik), and Bananas (Tamil Nadu/Andhra).
Summary Table: Regional Crop Specialization
| Agricultural Region | Soil Type | Rainfall | Principal Crops |
| Lower Ganga Plain | Alluvial | >150 cm | Rice, Jute, Pulses |
| Trans-Gangetic Plain | Alluvial | 70–125 cm | Wheat, Paddy, Sugarcane |
| Western Plateau/Ghats | Black (Regur) | 50–100 cm | Cotton, Jowar, Grapes |
| Southern Plateau | Red and Laterite | 60–100 cm | Groundnut, Millets, Oilseeds |
| West Coast | Laterite/Alluvial | >200 cm | Coconut, Spices, Rubber |
Agro-Climatic Zones (ACZ) vs. Agro-Ecological Regions (AER)
For UPSC Prelims, it is crucial to distinguish between these two classification systems:
- Agro-Climatic Zones (ACZ): Defined by the Planning Commission (now NITI Aayog) in 1988. There are 15 ACZs based on rainfall, temperature, and water availability.
- Agro-Ecological Regions (AER): Defined by the ICAR-NBSS&LUP (National Bureau of Soil Survey and Land Use Planning). There are 20 AERs based on soil types, climate, and the length of the growing period (LGP).
Strategic Insights for Aspirants
- Institutional Facts: The National Bureau of Soil Survey and Land Use Planning (NBSS&LUP), Nagpur, is the nodal agency for mapping these regions.
- Economic Transition: There is a shift from purely crop-based regions to “Integrated Farming Systems” (IFS) in the Indo-Gangetic plains to mitigate the soil depletion caused by the monoculture of wheat and rice.
- Climate Change Impact: The shifting rainfall patterns (shifting of 100 cm isohyet) are causing the “Rice-Wheat” belt to face heat-stress, leading to the promotion of “Climate-Resilient Agriculture” (CRA) in these regions.