Revision summary
The rice–wheat system is losing yield momentum because soils, aquifers, pests, and heat are stressed. Puddling, urea bias, residue burning, and a narrow variety base make the decline worse. Diversification with pulses, oilseeds, millets, maize, and horticulture breaks pest cycles and saves water. System yield and farm income stabilise only if the new crops have a buyer. Eastern India still has a rice–wheat yield gap to close; the north-west needs less paddy on overdrawn blocks.
Model answer
Copper italics in this answer — like this — are the key facts. Each one is unpacked in the Facts & figures rail.
Introduction
The rice–wheat rotation, especially in Punjab, Haryana and western Uttar Pradesh, was the Green Revolution’s gift: high yield on irrigation, dwarf seed, and fertiliser. Yield growth has slowed, and in many plots absolute yield is flat or falling once soil and water are exhausted. That is a system problem — the same two cereals, the same aquifers — not a single bad monsoon. Diversification is the yield-stability answer, not a slogan against grain.
Body
Why rice and wheat yields decline in the system
- Soil fatigue: continuous cereals mine organic carbon; puddled paddy destroys structure for the next wheat; micronutrients (zinc, iron, manganese) run short while urea is poured.
- Water: paddy on a falling water table raises pumping cost and stress; wheat on late-sown, moisture-poor beds after a delayed paddy harvest loses grain-fill.
- Salinity and sodicity from canal seepage and poor drainage in command areas.
- Pests, weeds, and resistance: brown plant hopper, blast, Phalaris and other weeds; overuse of the same pesticide and herbicide.
- Variety plateau: a narrow genetic base after the first dwarf-wheat and HYV-rice wave; seed replacement is weak on small lots.
- Climate: warmer nights cut wheat grain weight; untimely rain at harvest; extreme heat at flowering.
- Residue burning after combine harvest strips organic matter and pollutes; it is a symptom of a tight paddy–wheat calendar.
- Extension and tenancy: hired machines and absentee owners chase short-run tons, not soil tests.
- Outside the classic belt, rainfed rice and wheat fail on monsoon breaks and poor seed, which looks like “declining yield” in State averages when drought years cluster.
How diversification stabilises yield in the system
- Break the pest and weed cycle: a pulse, oilseed, maize, or vegetable year cuts the specialised enemies of rice and wheat.
- Nitrogen fixation by pulses and green manure restores fertility so the next cereal needs less urea for the same grain.
- Water: replacing some kharif paddy with millets, maize, or short pulses in Punjab–Haryana rest the aquifer; system yield (calories plus cash) can hold even if rice tons fall.
- Risk: a second crop type fails on different weather; farm income and calorie supply at national level are more stable than a two-crop bet.
- Soil structure: maize, cotton (where fit), and horticulture with residue return raise organic matter versus perpetual puddling.
- Market: diversification only stabilises if procurement, processing, and price exist for the new crop. Otherwise the farmer returns to paddy because the Food Corporation of India is the only certain buyer.
- Tools: crop holidays for paddy in over-exploited blocks, direct-seeded rice, happy seeder wheat without burning, MSP and PDS space for millets and pulses, and horticulture clusters with cold chain.
- Diversification is not abandoning rice–wheat in the eastern Gangetic plain where groundwater is still kinder and yield gaps are large; there, closing the gap with drainage and seed is the first stability move.
Flow diagram
flowchart TD RW[Rice wheat monoculture] --> Y[Yield slowdown] Y --> SOIL[Soil water pests heat] D[Diversification pulses millets horticulture] --> BRK[Break pest water cycle] BRK --> STAB[More stable system yield] MKT[MSP processing for new crops] --> D
Conclusion
Rice–wheat yields fall in the old Green Revolution system because soil, water, pests, heat, and a tight calendar are exhausted. Diversification — pulses, oilseeds, millets, maize, horticulture — breaks that calendar, rests aquifers, and spreads weather risk, but only if markets and procurement move with the seed. Stabilise the system; do not only chase last year’s paddy ton.
Quick related
Students also ask
-
How do subsidies affect the cropping pattern, crop diversity and economy of farmers? What is the significance of crop insurance, minimum support price and food processing for small and marginal farmers?
Next question on this syllabus topic (2017 · Q15). View answer →
-
Does diversification mean India should grow less grain?
It means less paddy on the most overdrawn blocks, while eastern yield gaps and buffers still protect food security.
-
Why do farmers not diversify on their own?
Because paddy and wheat have the surest procurement. Without a market for the alternative, diversification is a lecture.
Same topic · past papers
UPSC has asked this before
These previous-year questions sit on the same topic. Open one to practise the earlier ask.
More from this topic
Q14 · UPSC Mains 2026 · GS III · 15 marks · Solution
Discuss the different types of subsidies and supports provided by the Government of India to agricultural sector. Examine the related issues pertaining to Agreement on Agriculture of World Trade Organisation (WTO).
Crops, Irrigation and Marketing
• India supports farmers through MSP procurement, subsidized inputs like fertilizers and power, and cheap
Q13 · UPSC Mains 2026 · GS III · 15 marks · Solution
In which manner has Indian agriculture been transformed from food scarcity to food-surplus level? Describe the various government policies implemented for diversification of Indian agriculture.
Crops, Irrigation and Marketing
• India shifted from chronic post-independence food scarcity to a surplus nation through systemic technological
Q5 · UPSC Mains 2026 · GS III · 10 marks · Solution
Explain by giving two examples, how biotechnology has helped the Indian farmers in processing their perishable crops.
Crops, Irrigation and Marketing
• Biotechnology extends the post-harvest shelf life and processing capabilities of perishable crops, protecting farmers from distress sales. • Silencing ripening enzymes (like polygalacturonase) in transgenic varieties prevents premature softening and reduces transit losses. • Example 1: Genetically modified tomatoes engineered to resist rapid rotting during storage without complete cold-chain dependency. • Microbial fermentation and bio-processing convert surplus perishable harvests into stable, high-value industrial and food products. • Enzymatic maceration using pectinases and cellulases allows efficient fruit pulp breakdown and juice extraction. • Example 2: Biotech-driven conversion of surplus horticulture crops into stable concentrates, purees, and fermented beverages. • Scaling these interventions requires strengthening public-private research partnerships and biosafety frameworks.