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No single invention will replace fertilizer. Farming’s nitrogen future is a portfolio: precision application to prevent overuse, legumes and other biological fixation, manure and residue recycling, inhibitors and better timing to curb field losses, and lower-emissions ammonia to reduce manufacturing emissions. Policy, finance, advice and compatible data systems will determine how quickly farms can combine them.
The scale of the nitrogen problem
Human activity now adds approximately 150 teragrams (Tg) of reactive nitrogen to land each year, according to the Food and Agriculture Organization (FAO) in 2025. That is more than twice the pre-industrial rate. Livestock account for about one-third of human-caused nitrogen emissions, so the challenge extends beyond fertilizer factories and spreaders.
Fertilizer also has two separate emissions points. The International Energy Agency (IEA) estimated in 2025 that fertilizer production and use generate about 1.23 gigatonnes of carbon-dioxide equivalent annually worldwide. Roughly 60–70% of fertilizer-related emissions occur during use in fields. Cleaner factories therefore cannot solve the whole problem; application efficiency, crop management and loss prevention matter just as much.
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Why the answer is a portfolio
Nitrogen behaves differently across crops, soils, weather and supply chains. A legume rotation may add biologically fixed nitrogen but cannot meet every crop’s demand. A variable-rate applicator can avoid excess on a patchy field but needs reliable maps, equipment and skills. Recycled manure can replace purchased nutrients, yet storage and spreading determine whether nitrogen reaches crops or escapes to air and water. The practical objective is to match each source and practice to the place where it performs best.
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The technologies shaping nitrogen management
Precision agriculture: put nutrients where crops can use them
Variable-rate fertilizer application, yield monitors, soil or crop sensors and analytics allow an operator to adjust rates within a field instead of treating every hectare identically. The U.S. Government Accountability Office (GAO) reported in 2024 that only 27% of U.S. farms or ranches used precision-agriculture practices in 2023. GAO found potential for lower fertilizer use and better profitability, but identified high upfront costs, concerns about sharing farm data and interoperability gaps between equipment and software.
Precision tools are not an automatic nitrogen solution. They require calibration, training and trustworthy data governance. A prescription map built from poor yield data can simply move waste around. Systems that export data in common formats are more useful than isolated proprietary files because nutrient advisers, machinery and farm-management software must exchange the same field information.
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Biological fixation: let crops supply part of the nitrogen
Legumes capture atmospheric nitrogen through biological fixation. FAO recommends locally appropriate rotations that can include soybean or alfalfa where crop, soil and climate conditions permit. Rotations can reduce the amount of synthetic nitrogen needed by following crops, while also diversifying production. They are a complement rather than a universal substitute: suitability, market demand, water, disease pressure and the nitrogen credit from the preceding crop all vary by location.
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Organic and circular nitrogen: keep nutrients in circulation
Better manure management, organic fertilizers and recycling of crop and food residues return nitrogen to production instead of allowing it to become a pollutant. FAO also identifies treating food unsuitable for people as livestock feed as part of a more circular system. Storage, transport, application timing and nutrient analysis determine whether recycled material supplies crops efficiently. Without those controls, ammonia and nitrate losses can offset the benefit of recycling.
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Inhibitors, timing and improved nitrogen-use efficiency
IEA identifies inhibitors, improved nitrogen-use efficiency (NUE), crop rotation and land sparing among the measures needed to cut use-phase emissions. Inhibitors and better timing are designed to keep nitrogen available to plants for longer and reduce losses after application. Their performance depends on product, soil, weather, crop and application method, so they should be selected within a nutrient-management plan rather than treated as a universal add-on.
NUE is a useful management signal because it asks how much applied nitrogen becomes useful crop output. It should be read alongside yield, residual soil nitrogen and losses to air and water; maximizing one number by under-fertilizing can damage food production or soil fertility.
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Lower-emissions ammonia: clean the production side
Ammonia made with carbon capture and storage (CCS) or with electrolytic hydrogen can lower manufacturing emissions. IEA reported in 2025 that announced low-emissions ammonia projects total about 19 million tonnes, less than 10% of global production. Without policy support, average production is estimated at about 30% more for CCS-equipped routes and three times more for electrolysis than for conventional routes.
Those figures explain why lower-emissions ammonia is one part of the transition, not a reason to keep application rates unchanged. Because most fertilizer-related emissions occur during use, a cleaner molecule still needs precise placement, appropriate timing and loss controls on the farm.
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How a farm can combine the options
- Measure the starting point. Assemble yield records, application histories and available soil or nitrate test results. Establish field-level nitrogen balances and identify areas where rates, timing or losses are consistently out of line.
- Map field variability. Use yield monitors, sensors and other precision-agriculture data to create management zones. Check that files can move between the farm’s equipment, analytics and adviser systems before buying additional hardware.
- Set a crop-specific nutrient plan. Account for the crop, expected yield, soil supply, previous legumes, manure nutrients and local weather. Choose variable rates where field differences are large enough to justify the equipment and management effort.
- Add biological and recycled sources where they fit. Evaluate a locally suitable legume rotation and test manure or organic materials for nutrient content. Plan storage and application so that recovered nitrogen is available to the crop rather than lost before spreading.
- Reduce avoidable losses. Select appropriate inhibitors and application windows, and coordinate placement and timing with crop uptake. Record the product, rate, weather and equipment setting so results can be compared across seasons.
- Verify outcomes and adjust. Track yield, NUE, fertilizer purchases, residual nitrogen and indicators of ammonia, nitrate and nitrous-oxide loss. Revisit the plan when weather, crop rotation or manure supply changes.
How the main options compare
| Option | Primary role | Loss and greenhouse-gas effect | Best fit and constraints | Cost or scale evidence |
|---|---|---|---|---|
| Precision agriculture | Matches rates and placement to field variability | Can reduce fertilizer application; field results depend on data and execution | Fields with measurable variability; needs training, data governance and interoperable systems | High upfront costs reported by GAO; no universal payback stated |
| Legume rotations | Fixes atmospheric nitrogen biologically | Can reduce synthetic-nitrogen demand in following crops | Locally suitable crops such as soybean or alfalfa; constrained by climate, soil and markets | Farm-specific costs and nitrogen credits not stated |
| Manure and residue recycling | Returns nutrients to fields | Can reduce losses and purchased inputs when storage and application are managed well | Livestock and mixed farms with safe storage, testing and transport capacity | Farm-specific costs not stated |
| Inhibitors and improved timing | Keeps nitrogen available to crops and limits escape | Targets use-phase ammonia, nitrate and nitrous-oxide losses | Depends on product, soil, weather, crop and application method | Product and operating costs not stated |
| CCS ammonia | Reduces emissions during fertilizer production | Addresses manufacturing emissions; does not remove field losses | Requires industrial carbon capture, storage and supportive policy | Average production estimated about 30% higher than conventional routes without policy support |
| Electrolytic ammonia | Uses low-emissions hydrogen for ammonia production | Addresses manufacturing emissions; farm efficiency is still required | Requires substantial clean electricity and new industrial capacity | Average production estimated about three times conventional routes without policy support; announced projects total 19 million tonnes |
Measurement, finance and policy will decide adoption
Farmers need more than a product catalogue. IEA calls for common lifecycle accounting, soil-health metrics, biological standards, financing and technical assistance. Common methods are important because a claim of “lower nitrogen emissions” can refer to factory production, field use or the entire life cycle. Buyers, lenders and regulators need to know which boundary was measured.
Adoption also depends on who pays for equipment, testing and advice. GAO’s finding that only 27% of U.S. farms and ranches used precision practices in 2023 shows that technical capability alone has not produced broad uptake. Training, interoperable data and affordable finance can matter as much as sensor accuracy.
Governments are increasingly treating nitrogen as an air, water, climate and soil issue at once. The German Environment Agency’s 2024 report, “Fostering win-win farming practices…”, reviews measures that can reduce ammonia, nitrate, nitrous-oxide and methane impacts together. The United Kingdom’s Department for Environment, Food and Rural Affairs Nutrient Management Expert Group report issued 15 recommendations in 2024 spanning air quality, water quality, soil health, the circular economy and net zero.
What farmers and technology buyers should avoid
- Expecting green ammonia to replace efficiency. Cleaner production does not prevent losses after application.
- Buying precision hardware without a data plan. Incompatible formats, weak records or uncalibrated sensors can erase the expected benefit.
- Counting recycled nitrogen before testing it. Manure and residues vary in nutrient content; storage losses also change the amount that reaches a crop.
- Using a rotation or inhibitor outside its suitable conditions. Crop, soil and weather determine whether a practice delivers its intended result.
- Reporting one metric in isolation. NUE, yield, soil nitrogen and air- or water-quality indicators should be considered together.
What comes next
FAO Assistant Director-General Thanawat Tiensin said, “Nitrogen Use Efficiency (NUE) has seen improvements in recent years, which is encouraging. However, significant work remains to be done.” The agency’s authors describe sustainable nitrogen management as crucial to the Sustainable Development Goals, including hunger, health, clean water, sustainable consumption, climate action and life on land and underwater.
The direction is therefore additive, not substitutive. Precision tools can cut avoidable applications; legumes and recycled materials can supply part of the crop’s needs; inhibitors and timing can reduce losses; and lower-emissions ammonia can shrink the production footprint. The farms that make the largest gains will combine those measures with credible measurement, practical finance and data systems that work together.
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