Indian agriculture: cropping patterns, Green Revolution & irrigation

The Three Cropping Seasons

Indian agriculture is structured around three crop seasons keyed to the monsoon calendar. Kharif crops are sown with the southwest monsoon (June–July) and harvested September–October: rice, jowar, bajra, maize, cotton, groundnut, jute, tur (arhar). Rabi crops are winter-sown (October–December) and spring-harvested (March–April), depending on retreating-monsoon moisture and western disturbances over the northwest: wheat, barley, gram, mustard, peas. Zaid is the short summer season (March–June) for watermelon, muskmelon, cucumber and fodder, dependent on irrigation.

Geographic Distribution of Major Crops

Rice dominates where rainfall exceeds 100–200 cm or assured irrigation exists: West Bengal (largest producer), Uttar Pradesh, Punjab, Andhra Pradesh, the deltaic east coast and Assam. It needs 25°C+ temperatures and standing water. Wheat is a rabi crop of the northwestern plains—Uttar Pradesh (largest), Punjab and Haryana—requiring cool growing weather and 50–75 cm rainfall with bright harvest-time sunshine.

Millets (jowar, bajra, ragi) are dryland crops of the Deccan and Rajasthan, rebranded 'Shree Anna'/nutri-cereals after the UN declared 2023 the International Year of Millets. Cotton grows on the black regur soils of the Deccan lava plateau—Gujarat, Maharashtra, Telangana. Sugarcane concentrates in Uttar Pradesh and the irrigated Maharashtra–Karnataka belt. Tea requires well-drained slopes and 150–300 cm rain (Assam, Darjeeling, the Nilgiris); coffee clusters on the Karnataka–Kerala–Tamil Nadu hill tracts.

Cropping Intensity and Patterns

Cropping intensity is the ratio of gross cropped area to net sown area; assured irrigation raises it above 150% in Punjab and Haryana. The Indo-Gangetic plain is dominated by the rice–wheat cropping system, the productive but ecologically stressed engine of national food security. The Standing Committee on Agriculture and the NITI Aayog have repeatedly flagged that monocropping rice and wheat depletes groundwater, fixes nutrient imbalance and traps farmers in the Minimum Support Price (MSP) procurement cycle, which historically favoured only these two cereals plus a few others.

India operates a dual classification of land use derived from the Land Revenue records: net sown area (~140 million hectares), forest, fallow (current and other), and culturable waste. Crop diversification toward pulses, oilseeds and horticulture is the stated policy goal, since India remains the world's largest pulse producer yet still imports to meet demand. The National Food Security Mission (2007) and Rashtriya Krishi Vikas Yojana (2007) target precisely these structural gaps. For the exam, you must be able to pair each crop with its temperature, rainfall and soil requirement and its leading producer state—the single highest-frequency fact cluster in Prelims agriculture questions.

The Green Revolution: Geography and Trade-offs

The Green Revolution of the mid-1960s combined high-yielding variety (HYV) seeds—notably Norman Borlaug's dwarf wheat strains and IRRI's IR-8 rice—with chemical fertilisers, assured irrigation and pesticides. India's High Yielding Varieties Programme launched in 1966–67 under Agriculture Minister C. Subramaniam, with M.S. Swaminathan as its scientific architect. Wheat output roughly trebled by the late 1970s, ending the 'ship-to-mouth' dependence on US PL-480 food aid.

Its geography was selective: it concentrated in Punjab, Haryana and western Uttar Pradesh—regions with canal and tubewell irrigation, consolidated holdings and the Food Corporation of India's assured MSP procurement (FCI established 1965, alongside the Agricultural Prices Commission). This produced sharp inter-regional and inter-crop disparities: eastern and rainfed India, and pulses/oilseeds/coarse grains, were largely bypassed. The ecological bill—falling water tables (CGWB has classified large parts of Punjab as 'over-exploited'), soil salinisation, micronutrient depletion and stubble-burning pollution—now dominates policy debate.

Irrigation: Sources and the Groundwater Crisis

Irrigation in India draws on three principal sources. Wells and tubewells are now dominant—over 60% of net irrigated area—concentrated in the alluvial plains where groundwater is accessible; their spread accelerated with rural electrification and subsidised power. Canals (the Indira Gandhi Canal in Rajasthan; the Upper Ganga and Sirhind canals) lead in the northern plains' flat, perennial-river terrain. Tanks persist in the peninsular hard-rock south (Tamil Nadu, Telangana) where impermeable bedrock blocks well irrigation.

The Accelerated Irrigation Benefits Programme (1996) and the Pradhan Mantri Krishi Sinchayee Yojana (PMKSY, 2015)—with its 'Per Drop More Crop' micro-irrigation and watershed components—structure current policy. The Command Area Development Programme (1974) addressed the gap between irrigation potential created and utilised.

The central crisis is groundwater. India is the world's largest groundwater user; the Central Ground Water Board's assessment blocks repeatedly show the northwest's water table in steep decline, driven by free/subsidised power and water-intensive paddy in low-rainfall Punjab. Drip and sprinkler systems, direct-seeded rice, and crop diversification away from paddy are the geographer's prescribed correctives. Note the canal-vs-tank-vs-well distribution as a function of relief, rock type and rainfall—a classic map-based Prelims trap and a Mains GS-1 'resources and their geographical basis' theme.

Why This Matters for the Exam

Indian agriculture is a perennial, high-weight zone across the UPSC papers, and this lesson feeds three of them directly.

Prelims GS Paper I tests crop–condition–region matching with surgical precision. The recurring formats are: (1) match the crop to its leading producer state; (2) match the crop to its temperature/rainfall/soil requirement; (3) identify whether a crop is kharif, rabi or zaid; and (4) statement-based questions on schemes (PMKSY, NFSM, RKVY, e-NAM, PM-KISAN). The 2018–2023 Prelims repeatedly featured questions on minor irrigation, watershed development, MSP coverage, and the soil/crop pairings—so memorise the regur-cotton, alluvium-wheat/rice, red-soil-millets associations cold.

Mains GS-1 carries the geography mandate: 'distribution of key natural resources' and 'factors responsible for the location of agro-based industries'. The Green Revolution's selective geography, the rice–wheat system's groundwater cost, and the canal/tank/well distribution as a function of relief and rock type are textbook GS-1 essay material. Mains GS-3 then takes the same content into 'cropping patterns, irrigation systems, food security, MSP, and farm subsidies'—so the two-mark fact and the fifteen-mark argument come from one knowledge base.

The PYQ Angle and High-Yield Retention

Past questions to internalise: the 2017 Mains asked how the Green Revolution caused 'second-generation' environmental problems; questions have probed why pulse production lags despite India being the largest producer, and the case for crop diversification in Punjab. The examiner rewards a candidate who can (a) name the dated policy instrument—HYVP 1966–67, FCI 1965, PMKSY 2015, the M.S. Swaminathan committee—and (b) connect it to a physical-geography cause (rainfall, soil, groundwater).

Retain this cluster: kharif/rabi/zaid crop lists; the three irrigation sources and their geographic logic; the Green Revolution's beneficiary regions and crops; the over-exploited groundwater belt; and four named schemes with their launch years. A single, well-structured answer that links a crop's distribution to climate and soil, then to the policy and sustainability consequence, scores in the top band because it demonstrates the integrated reasoning UPSC explicitly seeks.