Sustainable intensification
Sustainable intensification: more output on existing land with less harm, its practices, land sparing vs sharing, metrics such as NUE, and critiques.
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The world needs more food, fibre and fuel, but cannot keep clearing forests and grasslands to grow them. Agricultural expansion is the main driver of deforestation and biodiversity loss, and it releases large amounts of carbon. Yet intensification as practised in many places, with heavy fertiliser, pesticide and water use, has polluted rivers, depleted aquifers, degraded soils and contributed to greenhouse gas emissions.
Sustainable intensification (SI) tries to resolve this dilemma. It means producing more from the same area of land while reducing the negative environmental impacts and maintaining or improving natural capital and ecosystem services. The idea was popularised by the UK Royal Society's report Reaping the Benefits (2009), building on earlier work by Jules Pretty and others in the 1990s. It is now central to the strategies of FAO, CGIAR, national governments and agribusiness.
Core ideas
- Intensify on existing farmland, to avoid converting natural ecosystems.
- Close yield gaps: in many regions, farmers' yields are far below what is achievable with good practice. The gap is often 50% or more in sub-Saharan Africa and parts of South Asia.
- Raise resource-use efficiency: more output per unit of nitrogen, water, energy and labour, which means lower losses per tonne.
- Use ecological processes, such as biological nitrogen fixation, natural pest control and soil biology, alongside improved technology.
- Context matters: SI is a goal, not a fixed set of practices. The right mix differs between a smallholder plot in Bihar and a large farm in Brazil.
Practices
| Area | Examples |
|---|---|
| Genetics | High-yielding, stress-tolerant and pest-resistant varieties; improved livestock breeds |
| Nutrients | Soil testing, the 4R approach, integrated nutrient management, legumes, inhibitors and coated fertilisers |
| Pests | Integrated pest management, farmer field schools, resistant varieties, biological control |
| Soil and water | Conservation agriculture (minimum tillage, residue cover, rotation), drip and sprinkler irrigation, alternate wetting and drying in rice |
| Systems | Crop–livestock integration, agroforestry, intercropping, rotations, aquaculture in rice fields |
| Technology | Precision agriculture, laser land levelling, digital advisory |
A widely cited global assessment (Pretty and colleagues, 2018) estimated that 163 million farms on about 450 million hectares, roughly 9% of agricultural land, had adopted some form of SI redesign. The estimate covered methods such as IPM, conservation agriculture and agroforestry.
Indian examples
- Zero-till wheat and the Happy Seeder in rice–wheat systems: earlier sowing, lower cost, and no residue burning.
- Laser land levelling, which saves water and raises yields.
- System of Rice Intensification and direct-seeded rice, which reduce water and labour.
- Soil Health Cards and neem-coated urea, which improve nutrient use.
- Micro-irrigation under Per Drop More Crop.
Measuring success
SI is judged by several indicators together:
- Productivity: yield per hectare and per animal.
- Efficiency: nitrogen use efficiency, water productivity (kg per m3) and energy use.
- Environmental indicators: nutrient surpluses, GHG emissions per tonne, soil organic carbon and biodiversity.
- Social and economic indicators: farm income, labour, risk and equity.
Better nitrogen management in rice
In a farmer's usual practice, 150 kg N per ha is applied. Crop N uptake is 120 kg per ha, against 60 kg per ha without fertiliser. REN = (120 − 60) ⁄ 150 × 100 = 40%: 60% of the nitrogen is lost to air or water. With split doses guided by a leaf colour chart and neem-coated urea, 125 kg N per ha gives an uptake of 135 kg. REN = (135 − 60) ⁄ 125 × 100 = 60%. Yield rises slightly, and less fertiliser is used. That combination of higher output, lower input and lower loss is exactly what SI aims for.
Land sparing versus land sharing
A long debate concerns how best to combine farming and conservation:
- Land sparing: farm intensively on some land and set aside other land for nature. Studies of birds and trees in Ghana and India (Phalan and colleagues, 2011) suggested that many species would fare better under sparing.
- Land sharing: integrate nature into farmland through hedgerows, trees, diverse crops and low-input practices. This supports species that live in farmed landscapes, along with pollination and pest control.
In practice, most landscapes need a mix. A key risk with sparing is the rebound effect (Jevons paradox): if intensification makes farming more profitable, it may encourage clearing more land unless there are strong protections such as land-use planning and forest laws.
Critiques
- Vagueness: "sustainable intensification" can be used to justify almost any practice, including input-heavy approaches with small efficiency gains.
- Production focus: critics argue that the focus on output neglects distribution, diets and food waste, which also determine food security.
- Power and equity: technologies may favour larger farmers or input companies.
- Agroecology versus SI: agroecologists argue for deeper system redesign and social change, while SI advocates accept a wider mix of technologies. Many researchers see overlap, with ecological intensification as common ground.
Key points
- Sustainable intensification means producing more from existing land with less environmental harm, while maintaining natural capital. It was popularised by the Royal Society (2009).
- Its core aims are closing yield gaps, raising resource-use efficiency, using ecological processes, and avoiding land conversion.
- Practices include improved varieties, 4R nutrients, IPM, conservation agriculture, efficient irrigation, integrated systems and precision tools.
- Success is measured with combined indicators: yield, nitrogen use efficiency, water productivity, emissions per tonne, soil carbon and income.
- In the land sparing and sharing debate, most landscapes need both, with protections against rebound effects.
- Critiques focus on vagueness, production bias and equity; ecological intensification bridges SI and agroecology.
What the exams ask
- Define sustainable intensification and explain its rationale.
- List practices and give Indian examples.
- Calculate nitrogen recovery efficiency.
- Explain land sparing and land sharing.
- Compare sustainable intensification with agroecology.
Described in general terms: the kind of examination, not a past paper. Laisha never reproduces exam questions.
Questions people ask
Is sustainable intensification just a new name for the Green Revolution?
No. The Green Revolution focused on raising yields through improved varieties, fertilisers and irrigation, often with little attention to environmental costs. SI keeps the yield goal but adds explicit goals of efficiency, lower pollution and healthy ecosystems. It also recognises the Green Revolution's costs, such as groundwater depletion and soil degradation.
Can organic farming be sustainable intensification?
It can, if it raises productivity on existing land while protecting the environment, for example through diverse rotations and good nutrient recycling. But lower average organic yields mean more land may be needed for the same output, which some analysts see as a tension with SI's land-saving goal.
Why does intensification sometimes increase land clearing?
When farming becomes more profitable, farmers and companies may expand into forest or grassland to earn more, especially where land is cheap and protection weak. Pairing intensification with land-use planning, protected areas and deforestation-free supply chains guards against this rebound.
Sources
- The Royal Society. Reaping the Benefits: Science and the Sustainable Intensification of Global Agriculture. Royal Society, London, 2009.
- Garnett, T. et al. "Sustainable intensification in agriculture: premises and policies." Science 341, 33–34 (2013).
- Pretty, J. et al. "Global assessment of agricultural system redesign for sustainable intensification." Nature Sustainability 1, 441–446 (2018).
- Phalan, B., Onial, M., Balmford, A. and Green, R. E. "Reconciling food production and biodiversity conservation: land sharing and land sparing compared." Science 333, 1289–1291 (2011).
- Ladha, J. K., Pathak, H., Krupnik, T. J., Six, J. and van Kessel, C. "Efficiency of fertilizer nitrogen in cereal production: retrospects and prospects." Advances in Agronomy 87, 85–156 (2005).
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