Impact of Chemical Fertilizers on Indian Agriculture

Chemical fertilizers have been one of the most transformative inputs in the history of Indian agriculture. From helping the country overcome chronic food shortages during the 1960s to making it a food-surplus nation by the early 2000s, these inputs reshaped farming at a scale few other technologies could match. But this progress came with trade-offs – declining soil health, water pollution, and growing environmental concerns that are now impossible to ignore. Understanding how chemical fertilizers shaped Indian agriculture, and where the future is headed, is essential for anyone connected to the food system.

The arrival of chemical fertilizers in India 🔗

Before the 1960s, Indian agriculture relied almost entirely on organic manure, crop rotation, and traditional soil management. Farmers had for centuries maintained soil fertility through practices like composting, using cattle dung, and leaving fields fallow. But with the country’s population growing faster than food production, India faced severe food shortages and was heavily dependent on food imports and foreign aid.

The Green Revolution, which began in India during the mid-1960s under the leadership of agricultural scientist M.S. Swaminathan, changed this trajectory. The initiative introduced high-yielding variety (HYV) seeds of wheat and rice, which needed significantly more nutrients than traditional crop varieties. This created a direct and urgent demand for chemical fertilizers – particularly nitrogen, phosphorus, and potassium-based products – to supply the nutrients that HYV crops required for their full yield potential.

The Indian government responded by subsidizing fertilizer inputs and investing in domestic manufacturing capacity. By 1980, over 100 fertilizer factories had been established across the country, dramatically increasing the domestic production of urea, phosphatic fertilizers, and potassic fertilizers. This infrastructure expansion marked the beginning of India’s large-scale reliance on chemical inputs in agriculture.

How chemical fertilizers boosted food production 🔗

The impact of chemical fertilizers on India’s food output was enormous. In the mid-1960s, total fertilizer consumption in India was less than 1 million tonnes of nutrients. By the early 2000s, it had crossed 17 million tonnes. This rapid growth in fertilizer use, combined with irrigation expansion and improved crop varieties, transformed the country’s food production capacity.

India’s food grain production rose from approximately 83 million tonnes in 1961 to over 211 million tonnes by 2001. Wheat output saw the most dramatic gains – states like Punjab, Haryana, and western Uttar Pradesh, which had reliable irrigation and adopted Green Revolution technologies early, became the country’s grain bowls. Punjab alone was producing 70% of India’s total food grains by 1970.

According to a comprehensive review published in Regional Environmental Change, per hectare food grain production in India increased 3.4 times between 1961 and 2021, while fertilizer nutrient consumption increased over 63 times during the same period. Importantly, despite India’s population growing more than three times from 1961 to 2022, per capita availability of wheat increased by 2.4 times – a result directly tied to increased fertilizer application along with expanded irrigation.

The role of government subsidies 🔗

Chemical fertilizers did not become widespread in India by market forces alone. The government played a central role through a series of pricing and subsidy policies starting in the 1950s. The Retention Price Scheme (RPS), introduced in 1977, was the first major fertilizer subsidy mechanism. It ensured that fertilizer manufacturers received a guaranteed return, while farmers paid a controlled, affordable price.

Over the decades, additional policies like the Nutrient Based Subsidy (NBS) introduced in 2010 and the Neem Coated Urea mandate of 2015 tried to refine how subsidies were distributed and improve nutrient use efficiency. As of 2024-25, the Indian government allocated approximately ₹1.92 lakh crore for fertilizer subsidies – a figure that highlights just how deeply embedded chemical fertilizers are in India’s agricultural economy.

Types of chemical fertilizers used in India 🔗

The three primary nutrients supplied through chemical fertilizers are nitrogen (N), phosphorus (P), and potassium (K). Each serves a distinct function in plant growth, and India’s consumption pattern is heavily skewed towards nitrogen.

Nitrogenous fertilizers 🔗

Urea is the dominant nitrogenous fertilizer in India, accounting for over 80% of total nitrogen consumption. It promotes vegetative growth and is essential for crops like rice and wheat. India’s domestic urea production has grown steadily – six new urea plants were commissioned in recent years, adding significant capacity. However, a portion of demand is still met through imports.

Phosphatic fertilizers 🔗

Di-ammonium phosphate (DAP) is the most widely used phosphatic fertilizer, supplying both nitrogen and phosphorus. Phosphorus is critical for root development, flowering, and seed formation. India’s domestic production of DAP meets only about 40% of demand, with the rest imported from countries like Saudi Arabia, Morocco, and China.

Potassic fertilizers 🔗

Muriate of potash (MOP) is the primary source of potassium for Indian farmers. Potassium strengthens plant resistance to diseases, improves water regulation, and enhances crop quality. India has no significant domestic potash reserves, which means 100% of potassic fertilizers are imported – primarily from Canada, Russia, Belarus, and Jordan.

India’s current fertilizer consumption landscape 🔗

India is now the world’s second-largest consumer of fertilizers after China. In 2023-24, total fertilizer consumption was approximately 601 lakh metric tonnes (about 60 million tonnes), of which around 503 LMT was produced domestically and 177 LMT was imported. Nitrogen-based fertilizers dominate the consumption pattern – urea alone accounted for about 35.78 million tonnes in the same period.

The consumption intensity varies widely across the country. States like Punjab, Haryana, Telangana, Andhra Pradesh, and Bihar consume over 200 kg of fertilizer per hectare, while states like Rajasthan and Madhya Pradesh use less than 100 kg per hectare. This disparity is closely linked to the extent of irrigation infrastructure – irrigated areas receive approximately 60% of all fertilizer applied in the country.

The environmental cost of chemical fertilizer overuse 🔗

While chemical fertilizers fueled India’s food security, their excessive and imbalanced use has led to serious environmental consequences that threaten the long-term sustainability of agriculture itself.

Soil degradation 🔗

Continuous application of nitrogen-heavy fertilizers without adequate phosphorus and potassium has depleted soil organic matter and disrupted nutrient balance. A study by the Centre for Science and Environment (CSE) found that of over five crore soil samples tested across India, 97% were deficient in nitrogen, 85% lacked adequate organic carbon, 83% were low in phosphorus, and 71% were deficient in potassium. This paints a stark picture of soil health decline.

Research by the Indian Council of Agricultural Research also revealed that the fertilizer response ratio – the amount of grain produced per kilogram of fertilizer applied – dropped from 13.4 in 1970 to just 2.7 by 2015. In other words, the same quantity of fertilizer now produces far less grain than it did five decades ago.

Water pollution 🔗

Excess nitrogen from fertilizers leaches into groundwater and runs off into rivers and lakes. In Punjab, studies have shown that approximately 29% of applied nitrogen is lost through leaching into groundwater. Nitrate contamination of drinking water sources has become an increasing public health concern in intensively farmed regions across northern India.

Greenhouse gas emissions 🔗

Surplus nitrogen in the soil leads to emissions of nitrous oxide (N₂O), a greenhouse gas roughly 300 times more potent than carbon dioxide. According to research published in the Journal of Ethnic Foods, the Green Revolution era brought about an increased dependence on chemical inputs that, over time, contributed to rising agricultural emissions. The nitrogen surplus in Indian soils increased from 17.5 kg N per hectare in 1961 to over 100 kg N per hectare by 2021.

The imbalanced use problem 🔗

One of the most pressing issues with chemical fertilizer use in India is the imbalanced application of nutrients. Because urea is heavily subsidized and much cheaper than phosphatic and potassic fertilizers, farmers tend to overuse nitrogen while applying insufficient phosphorus and potassium. In states like Punjab and Haryana, some farmers apply 50-70% more nitrogen than recommended by agricultural scientists.

The ideal N:P:K ratio for balanced crop nutrition is considered to be around 4:2:1. However, the actual consumption ratio in India has frequently deviated from this target – widening especially after policy changes like the decontrol of phosphatic and potassic fertilizer prices in 1992, which made P and K fertilizers more expensive relative to urea. This imbalance not only reduces crop yields over time but also accelerates environmental damage.

Sustainable alternatives: biofertilizers and organic fertilizers 🔗

Recognizing the diminishing returns and environmental harm from chemical fertilizer overuse, India has been gradually promoting sustainable alternatives. Biofertilizers and organic fertilizers are at the centre of this shift.

What are biofertilizers? 🔗

Biofertilizers are preparations containing living microorganisms that, when applied to seeds, roots, or soil, enhance the availability of nutrients to plants. They work by fixing atmospheric nitrogen, solubilizing phosphorus, or mobilizing potassium. Common types include Rhizobium (for leguminous crops), Azotobacter (for cereals and vegetables), and Phosphate Solubilizing Bacteria (PSB).

According to IFFCO, India’s largest fertilizer cooperative, the organization now produces a range of biofertilizers including nitrogen-fixing, phosphate-solubilizing, potassium-mobilizing, and zinc-solubilizing formulations. The production of carrier-based solid biofertilizers in India reached roughly 134,323 tonnes in 2020-21, representing an 83% increase over 2018-19 figures.

Government initiatives for sustainable fertilizer use 🔗

The Indian government has launched several programmes to encourage the shift toward sustainable nutrient management. The Paramparagat Krishi Vikas Yojana (PKVY) promotes organic farming through cluster-based approaches. The Bharatiya Prakritik Krishi Padhati (BPKP) supports natural farming methods. The Soil Health Card Scheme, launched in 2015, provides farmers with soil test-based fertilizer recommendations – though its on-ground effectiveness has been limited by challenges in sample collection and farmer awareness.

More recently, nano fertilizers – particularly nano urea developed by IFFCO – have gained attention. These products deliver nutrients in tiny particles that are more efficiently absorbed by plants, potentially reducing the volume of fertilizer needed per hectare. The PM-PRANAM scheme also incentivizes states that reduce chemical fertilizer use and promote organic alternatives.

Organic farming in India 🔗

India has a significant base of organic material resources. A 2020 study estimated that the country produces approximately 1,056 million tonnes of organic material (cattle dung, crop residue, and municipal solid waste) annually, of which about 35% is available for use as organic fertilizer. If utilized effectively, this could substantially reduce dependence on chemical inputs. India is also among the top countries globally in terms of certified organic farmland, though organic farming still accounts for a small share of total cultivated area.

The road ahead: balancing productivity and sustainability 🔗

Chemical fertilizers will continue to play a role in Indian agriculture for the foreseeable future – the sheer scale of food demand from a population exceeding 1.4 billion makes it difficult to eliminate them entirely. However, the focus is shifting toward balanced fertilization, integrated nutrient management, and reducing dependence on imported raw materials.

Key priorities for the future include recalibrating fertilizer subsidies to ensure phosphatic and potassic fertilizers are as affordable as urea, expanding soil testing infrastructure, investing in biofertilizer research and development, and promoting precision agriculture technologies that allow farmers to apply exactly the nutrients their soil and crops need. The transition from purely chemical-dependent farming to a more sustainable system will not happen overnight, but the direction is clear.

What do you think? Can Indian agriculture maintain its current production levels while significantly reducing chemical fertilizer use? What role should small and marginal farmers – who consume over 50% of all fertilizers in India – play in driving the transition toward sustainable nutrient management?

References

1. https://www.britannica.com/event/green-revolution
2. https://www.fao.org/4/a0257e/a0257e01.htm
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4. https://www.drishtiias.com/daily-updates/daily-news-analysis/fertilizer-sector-in-india
5. https://www.cseindia.org/state-of-biofertilizers-and-organic-fertilizers-in-india-11235
6. https://link.springer.com/article/10.1186/s42779-019-0011-9
7. https://www.iffco.in/en/organic-and-bio-fertilisers
8. https://www.pib.gov.in/PressNoteDetails.aspx?NoteId=154966&ModuleId=3
9. https://www.sciencedirect.com/science/article/pii/S2666683923000652