Ecological Impact of Agricultural Advancement: The Green Revolution’s Legacy

The Green Revolution of the 1960s transformed agriculture across the developing world, turning food-deficit nations into self-sufficient producers. In India, this agricultural transformation helped the country move from dependence on food imports to becoming an exporter of grains. However, this remarkable achievement came at a significant environmental cost. The intensive farming practices that boosted productivity have left lasting scars on our ecosystems, raising serious questions about the sustainability of modern agriculture.

The Green Revolution’s productivity gains 🔗

The Green Revolution, led in India by geneticist M.S. Swaminathan, introduced high-yielding varieties (HYVs) of seeds, particularly wheat and rice, that could produce two to three times more grain than traditional crops. The initiative began in 1968 under Prime Minister Lal Bahadur Shastri and primarily benefited Punjab, Haryana, and Western Uttar Pradesh. By implementing a two-crop cycle of rice and wheat, farmers could harvest multiple times per year, dramatically increasing overall production.

The strategy combined several key elements: adoption of HYV seeds, extensive irrigation systems, heavy use of chemical fertilizers and pesticides, and mechanized farming equipment. After the Green Revolution, cereal crop production tripled with only a 30% increase in cultivated land area. India’s food grain production jumped from 50 million tonnes in the 1950s to 131 million tonnes by 1978-79 and reached 281 million tonnes by 2017-18. These gains helped reduce rural poverty and prevented widespread famine in a country with a rapidly growing population.

The hidden costs: agronomic problems emerge 🔗

While the productivity gains were impressive, they masked serious agronomic problems that would become apparent within a few decades. The intensive farming methods that made the Green Revolution possible began degrading the very resources they depended upon.

Arable land degradation 🔗

Continuous cultivation of the same crops year after year, known as monoculture, has severely depleted soil nutrients across India’s agricultural heartland. The repetition of crop cycles for increased production stripped the soil of essential organic matter. Research indicates that approximately 60% of the geographical area in Green Revolution regions faces soil degradation threatening future food security.

The Global Land Assessment of Degradation mapping exercise found that 43% of South Asia’s agricultural land was degraded to some degree. Subsequent studies suggested the problem was actually more severe, with nearly three-quarters of agricultural land affected and 40% moderately or severely degraded. This degradation has forced farmers to apply ever-increasing amounts of chemical fertilizers to maintain yields, creating a vicious cycle of dependency.

Soil salinity and alkalinity 🔗

One of the most damaging consequences of intensive irrigation has been the widespread increase in soil salinity and alkalinity. According to FAO estimates, globally 45 million hectares of irrigated land are affected by salt accumulation. In India, more than 9 million hectares suffer from salinization.

Salinity occurs when irrigation water leaves behind concentrated salts as it evaporates. The dwarf varieties of wheat and rice introduced during the Green Revolution require excessive and frequent irrigation, which accelerates soil salinization. These high fertilizer and water-consuming crop varieties essentially offer humanity two contrasting outcomes: food security and desert.

The application of alkaline chemical fertilizers and pesticides has also increased soil pH levels. This altered chemistry affects the soil’s ability to support beneficial microorganisms essential for maintaining fertility. The accumulated ions causing salinity or alkalinity include sodium, potassium, magnesium, calcium, chlorides, and carbonates, all of which impact agricultural production by increasing the osmotic potential of soil solution and preventing plants from accessing water and nutrients.

Waterlogging 🔗

Waterlogging and soil salinization are commonly referred to as a “twin menace” because they typically occur together in irrigated land. When farmers apply excessive irrigation water without adequate drainage systems, the water table rises. In Haryana, research found that since 1985, the water table has risen more than one meter annually, and patches of salinity have started appearing at farm level.

The combination of poor irrigation water quality, shallow saline groundwater tables, and low-permeability soils creates a synergistic effect that severely compromises soil health and agricultural productivity. Waterlogged soils prevent leaching of salts imported by irrigation water, leading to further salt accumulation. In severe cases, waterlogging renders agricultural lands completely unusable, forcing farmers to abandon once-productive areas.

Excessive inputs and toxic effects 🔗

The Green Revolution’s dependence on chemical inputs has created serious environmental and health consequences that extend far beyond farm boundaries.

Fertilizer overuse and environmental damage 🔗

India became one of the largest producers of pesticides in Asia following the Green Revolution. The overuse of chemical fertilizers has fundamentally altered soil biology. According to soil scientists, excessive fertilizer application essentially creates “dead” soil by eliminating beneficial bacteria and fungi that maintain natural soil health. This destruction of soil microbiome leads to further dependency on artificial inputs.

Research published in Science found that globally, farmers apply around 115 million tonnes of nitrogen to crops every year, but only about 35% is used by the plants. The remaining 75 million tonnes runs off into rivers, lakes, and natural environments, causing widespread pollution. This excess nitrogen causes eutrophication in water bodies, depleting oxygen and killing aquatic life.

The U.S. Department of Agriculture notes that when nutrients are applied in excess, they can be lost to the environment through volatilization into the air, leaching into groundwater, emission from soil to air, and runoff into surface water. In India, this has contaminated drinking water sources and degraded water quality in rivers, tanks, and reservoirs.

Pesticide toxicity 🔗

Over 98% of sprayed insecticides and 95% of herbicides reach destinations other than their target species because they are spread across entire agricultural fields. Environmental modeling indicates that globally over 60% of agricultural land is at risk of pesticide pollution, with over 30% at high risk. Pesticide runoff and drift carry these toxic chemicals into distant aquatic environments, grazing areas, and human settlements.

Heavy pesticide treatment has caused populations of beneficial soil microorganisms to decline dramatically. Plants depend on various soil microorganisms to transform atmospheric nitrogen into nitrates they can use. The destruction of these helpful organisms forces farmers to apply even more chemical fertilizers, perpetuating a harmful cycle. Additionally, pesticide use has disrupted natural pest-predator balances, leading to secondary pest outbreaks that require ever-stronger chemical treatments.

Impact on biodiversity and traditional crops 🔗

Due to the Green Revolution, India lost almost 100,000 varieties of indigenous rice. Before the revolution, there were over 3,000 variants of rice in cultivation; now only about ten modified varieties dominate. The sole cultivation of monohybrid crops has caused the removal of several indigenous species from cultivation, including drought-resistant millets and traditional pulses that required fewer inputs and were better adapted to local conditions.

The major problem with indigenous seeds was not that they were low-yielding, but that they could not withstand the chemical fertilizers being used. New varieties were specifically created to produce higher yields in conjunction with chemical fertilizers and intensive irrigation, making traditional farming knowledge obsolete.

The path forward: balancing productivity and sustainability 🔗

The consequences of the Green Revolution continue to affect India’s agricultural landscape. Rice yields became stagnant and dropped after about 30 years of initial growth, while wheat production declined due to decreasing genetic potential and monoculture cropping patterns. The productivity of other crops like potato, cotton, and sugarcane has also stagnated.

Any future agricultural interventions must be tested and piloted before implementation, with continuous evaluation of both benefits and harms. Alternative approaches such as organic farming, intercropping, and Zero Budget Natural Farming are being explored to reduce chemical dependency while maintaining productivity. The government of Andhra Pradesh has begun converting farmers to Climate Resilient Zero Budget Natural Farming after positive results showed increased yields and net income.

The Green Revolution’s legacy teaches us that interventions beneficial in the short term can become detrimental and irreversible over time when ecological principles are ignored. Sustainable agriculture requires working with nature rather than against it, recognizing that soil health, water resources, and biodiversity are the foundation of long-term food security.

What do you think? How can developing countries balance the urgent need for food security with the long-term requirement for environmental sustainability? What role should traditional farming knowledge play in shaping the future of agriculture?

References

1. https://en.wikipedia.org/wiki/Green_Revolution_in_India
2. https://pmc.ncbi.nlm.nih.gov/articles/PMC7611098/
3. https://www.sciencedirect.com/science/article/abs/pii/S016788090000219X
4. https://www.fao.org/soils-portal/soil-management/management-of-some-problem-soils/salt-affected-soils/more-information-on-salt-affected-soils/en/
5. https://www.downtoearth.org.in/environment/desertification-in-india-how-green-revolution-hastened-the-man-made-soil-degradation-75859
6. https://www.sciencedirect.com/science/article/abs/pii/S1470160X15002058
7. https://www.nature.com/articles/s41598-024-77954-x
8. https://ourworldindata.org/excess-fertilizer
9. https://www.ers.usda.gov/topics/farm-practices-management/fertilizers-pesticides
10. https://en.wikipedia.org/wiki/Environmental_impact_of_pesticides
11. https://link.springer.com/article/10.1186/s42779-019-0011-9