Nano urea and public health: why India must proceed with caution

Concerns have been raised in the scientific and policy community that India is scaling nano urea production and use at a pace that outstrips the available ev...

What Happened

Concerns have been raised in the scientific and policy community that India is scaling nano urea production and use at a pace that outstrips the available evidence on its long-term public health and environmental safety.
IFFCO (Indian Farmers Fertiliser Cooperative), the developer of nano urea, has announced plans to build 10 new manufacturing facilities with a combined annual production capacity of 440 million bottles by 2025, and to expand exports to 25 countries across Asia, Africa, and South America.
While IFFCO's nano urea is the only nano-fertiliser approved by the Government of India and included in the Fertiliser Control Order (FCO), scientific studies have reported inconsistent results — including some showing decreased rice and wheat yields compared to conventional nitrogen fertiliser.
Nano-sized particles (20–50 nm) can penetrate biological barriers that larger particles cannot, raising concerns about inhalation toxicity, soil microbiome disruption, and persistence in the food chain that have not been fully characterised.
The article calls for a precautionary approach: rigorous, independent long-term safety studies should precede mass deployment, particularly given the absence of harmonised regulatory guidelines for nano-agri inputs globally.

Static Topic Bridges

What is Nano Urea?

Nano urea is a liquid fertiliser containing nitrogen in nano-encapsulated form. IFFCO's product contains 4% nitrogen (N) as encapsulated nitrogen analogues embedded on an organic matrix, with particle sizes of 20–50 nanometres. At nano-scale, the surface area-to-volume ratio is vastly higher than conventional urea granules, theoretically enabling more efficient uptake by plant leaves through stomata and pores.

Administered as a foliar spray (sprayed on leaves) rather than soil application, unlike conventional urea which is broadcast onto soil.
Theoretically reduces nitrogen losses through volatilisation (ammonia gas release from soil) and leaching — two major inefficiencies of conventional urea.
Conventional urea use efficiency in Indian agriculture: approximately 30-40% (the rest is lost to volatilisation, leaching, and runoff).
IFFCO received Fertiliser Control Order (FCO) approval in 2021 — the first nano-fertiliser to be so approved.

Connection to this news: The speed of FCO approval and production scale-up has preceded the establishment of long-term safety data — a regulatory sequencing concern at the heart of the article's argument.

Nanoparticle Toxicology: Known Risks

Nanoparticles behave differently from their bulk-material counterparts due to their extremely small size and high surface reactivity. Emerging research has linked nanoparticle exposure to respiratory and cardiovascular diseases, neurotoxicity, and potential carcinogenicity — though most evidence relates to industrial nanoparticles (silica, titanium dioxide, carbon nanotubes) rather than nano-fertilisers specifically.

Routes of exposure for nano urea: inhalation during spraying (primary concern), dermal contact, ingestion via food residue.
Nano-scale particles (below 100 nm) can cross biological barriers including the lung-blood barrier, blood-brain barrier, and cell membranes.
Soil persistence: unlike ionic nitrogen from conventional urea, encapsulated nano-nitrogen may persist in soil differently, with unknown effects on soil microbial communities.
Current regulatory challenge: no harmonised international guidelines exist for nano-agri input safety assessment; OECD testing guidelines for nanomaterials are still evolving.

Connection to this news: The absence of long-term inhalation, dermal, and ecological toxicity data specific to nano urea — even as it is deployed at mass scale — is the central concern raised by the article.

Fertiliser Control Order (FCO) and Regulatory Framework

The Fertiliser Control Order, 1985 (issued under the Essential Commodities Act, 1955) is the primary legislative instrument governing the manufacture, import, sale, and distribution of fertilisers in India. It sets specifications, quality standards, and requires registration before any fertiliser can be sold.

FCO approval is administered by the Department of Agriculture & Farmers Welfare (DAFE) under the Ministry of Agriculture.
Nano urea was added to the FCO in 2021 through an amendment, based on bio-efficacy and biosafety-toxicity tests carried out by NABL-accredited and GLP-certified laboratories.
Critics argue that the testing period and protocols may not be adequate for characterising long-term environmental and human health impacts of a novel class of nanomaterial.
India does not yet have a separate regulatory framework for nano-agri inputs (distinct from nano-pharmaceuticals or nano-food additives).

Connection to this news: The FCO amendment that approved nano urea relied primarily on short-term bio-efficacy and safety tests; the article argues that a dedicated nano-specific regulatory protocol — with longer exposure timelines — is needed before further scale-up.

Subsidy Policy and Agricultural Input Governance

India spends approximately ₹1.5-2 lakh crore annually on fertiliser subsidies, predominantly on urea (which is the most heavily subsidised). The government has long sought to reduce urea overuse, which degrades soil health. Nano urea is positioned as a means to reduce subsidy expenditure by reducing the volume of conventional urea required per crop cycle.

Conventional urea subsidy: urea is sold at ₹242/50 kg (maximum retail price), while the actual production/import cost is several times higher; the difference is borne by the government.
IFFCO claims one bottle of nano urea (500 ml, ~₹240) can replace one bag of conventional urea (50 kg), representing a major cost saving.
However, independent field studies have shown mixed yield outcomes — some showing yield declines, which, if widespread, could have significant food security implications.
PM Nano Fertiliser initiative is the government's umbrella push to promote nano fertilisers as part of PM Pranam (Promotion of Alternate Nutrients for Agriculture Management) scheme.

Connection to this news: The economic and subsidy logic driving rapid nano urea scale-up may be prioritising short-term fiscal benefits over the precautionary assessment of long-term public health and ecological risks.

Key Facts & Data

Nano urea particle size: 20–50 nanometres (nm).
Nitrogen content in IFFCO nano urea: 4% N as encapsulated nitrogen.
FCO approval year: 2021 (first nano-fertiliser approved in India).
IFFCO's planned production capacity: 440 million bottles/year by 2025 across 10 factories.
Export target: 25 countries in Asia, Africa, South America.
Conventional urea nitrogen use efficiency in India: ~30–40%.
India's annual fertiliser subsidy: approximately ₹1.5–2 lakh crore (dominated by urea).
MRP of conventional urea: ₹242/50 kg bag (government-fixed); nano urea bottle (500 ml): ~₹240.
PM Pranam scheme: promotes alternative and nano fertilisers to reduce conventional urea subsidy burden.
Key regulatory body: Department of Agriculture & Farmers Welfare (FCO); no dedicated nano-agri input regulation yet.
Key concern: absence of harmonised OECD or Indian guidelines for long-term nano-agri input safety testing.