Nitrogenous Fertilizer Manufacturing in the United States (NAICS 325311)

A Histometrics industry primer for public-market and private investors.

1. Overview

Nitrogenous fertilizer manufacturing is the business of pulling nitrogen out of the air and turning it into the crop nutrient that feeds much of the world's grain. Every plant needs nitrogen to grow, but usable nitrogen is scarce in soil, so farmers add it. Roughly 78% of all nitrogen fertilizer used in the U.S. goes onto corn, which is the single most nitrogen-hungry major crop.[1]

The industry's defining feature is that it is really two businesses stacked on top of each other. First, it is an energy-conversion business: producers burn natural gas both as fuel and as the raw hydrogen source to synthesize ammonia (NH3), the parent chemical of all nitrogen fertilizer. Natural gas typically accounts for 70%-plus of the cash cost of making a ton of ammonia.[2] Second, it is a commodity-cycle business: the products (ammonia, urea, and UAN — urea-ammonium-nitrate solution) trade at global prices set by farm demand, grain economics, and supply shocks half a world away. Owners make money on the spread between low-cost input gas and the global price of nitrogen — not on brand, service, or customer loyalty.

Why an investor cares: the U.S. sits on cheap, abundant shale gas, which gives domestic plants a structural cost advantage over European and Asian rivals who pay far more for gas.[2] That advantage can narrow if U.S. LNG exports, power demand, or weather lift Henry Hub prices, or if overseas gas and coal costs fall — so it is the international gas differential, not merely the absolute U.S. gas price, that investors should monitor. Plus a highly concentrated market has made the best-run U.S. nitrogen producers cash machines in tight-supply years — and painfully cyclical in loose ones.

Public vs. private ways in. Public routes are narrow but real: a handful of listed producers, led by pure-play leader CF Industries, plus diversified crop-nutrient giant Nutrien and a small master limited partnership, CVR Partners. Private ownership is heavyweight: Koch Industries' fertilizer arm is the country's second-largest producer, and offshore suppliers such as Trinidad's Proman feed the U.S. market by ship and barge. Building a new plant is a $1-billion-to-$4-billion, multi-year commitment[3][4] — which is exactly why the public and private owners here are large, well-capitalized, and few.

2. What it is and how it's structured

Scope. NAICS (North American Industry Classification System) code 325311 covers U.S. establishments that manufacture nitrogen fertilizer materials and mixes: anhydrous and aqua ammonia, urea, ammonium nitrate, ammonium sulfate, nitric acid, and nitrogen solutions such as UAN. The code also includes establishments that make fertilizer from sewage or animal waste, or that combine self-manufactured nitrogenous materials with other ingredients.[5] The chemistry runs downstream from a single chokepoint — ammonia. Producers combine nitrogen from the air with hydrogen from natural gas to make ammonia via the Haber-Bosch process under heat and pressure, then "upgrade" that ammonia into the finished products farmers spread on fields.

The products differ in nitrogen concentration, which matters when comparing "product tons" with "nutrient tons": ammonia itself is 82% nitrogen, urea contains 46% nitrogen, and commercial UAN normally contains 28–32%.[6]

What it excludes (adjacent NAICS codes). This is a manufacturing code, so it captures the factories and little else:

• 325312 Phosphatic Fertilizer Manufacturing and 325314 Fertilizer (Mixing Only) Manufacturing — the other two legs of the fertilizer world (phosphate and potash-based blends) sit in separate codes. Establishments that only mix purchased ingredients belong in 325314, not here.[5]
• 424910 Farm Supplies Merchant Wholesalers and farm-retail distribution — the dealers who actually sell and deliver product to growers are not here.
• 111 Crop Production — the farmers who apply the fertilizer.
• Industrial ammonia used for explosives, plastics, refrigerants, and diesel-exhaust fluid (DEF, the emissions additive for diesel engines) is made in the same plants but is not a "fertilizer" end use; about 88% of U.S. ammonia output is fertilizer-bound, the rest industrial.[7]

How the plants operate. These are large, continuous-process chemical complexes rather than seasonal factories. Production normally runs year-round, interrupted by planned multiweek turnarounds or unplanned outages, while demand and delivery are highly seasonal around planting. On-site tanks and downstream terminals buffer this mismatch. Product moves by pipeline, rail, barge, and truck; because nitrogen fertilizer is bulky relative to its value, proximity to natural gas, river and rail infrastructure, terminals, and Corn Belt customers confers a real delivered-cost advantage. The EPA describes process condensate, compressor and boiler blowdown, leaks, and runoff among the industry's principal waste streams.[8]

Ownership mix. Ownership is corporate, capital-intensive, and consolidated — the opposite of a fragmented trade. There are no meaningful "mom-and-pop" nitrogen plants; the minimum efficient scale is an enormous, continuously running chemical complex. Owners are a mix of U.S.-listed companies (CF Industries, LSB Industries, CVR Partners), Canadian-listed Nutrien, privately held Koch Fertilizer, and foreign producers with U.S. plants or U.S.-directed exports (Yara of Norway; Proman of Trinidad; formerly Australia's Incitec Pivot, whose Louisiana plant CF bought in 2023).[9]

3. How big it is

Federal statistics capture this industry cleanly — it is concentrated, corporate, and fully surveyed, so the usual "undercount" problems (government-run or micro-operator industries) do not apply here. If anything, the risk runs the other way: because it is a manufacturing-only code, the figures below understate the wider nitrogen economy (import terminals, distribution, on-farm application) that lives in other NAICS codes.

Core federal figures for NAICS 325311:

Two things jump out. First, this is a high-output, low-headcount industry: about $15 billion of shipments from roughly 7,000 workers — the plants are automated and run around the clock, so revenue per employee is enormous and labor is a small slice of cost. Second, the U.S. Small Business Administration's size cutoff of 1,050 employees[12] is almost academic here — the average establishment employs only about three dozen people, yet the economics reward giant, capital-heavy plants, not many small ones. (Note that the 194-establishment count from Census should not be read as 194 world-scale ammonia plants: it includes smaller establishments making waste-derived and other nitrogenous fertilizers, counts establishments rather than firms, and uses a broader boundary than USGS's ammonia-plant census.)[11]

For physical scale, the U.S. Geological Survey tracks the underlying ammonia base: U.S. ammonia production was about 13.6 million metric tons in 2024 and an estimated 14 million metric tons of contained nitrogen in 2025, with apparent consumption of 15 million metric tons. USGS reports 18 producing companies operating 38 plants in 19 states, with one additional plant idle throughout the year. Active plants operated at about 80% of rated capacity on average. Production capacity is concentrated in Louisiana, Oklahoma, and Texas (about 57% of capacity) because that is where cheap natural gas is. Net import reliance was only 5% of apparent consumption, with Canada supplying 49% and Trinidad and Tobago supplying 47% of ammonia imports during 2021–24.[7]

Note on scope and year: the federal $15.0 billion is 2022 shipments; private market-research firms publish U.S. "nitrogen fertilizer market" figures ranging from roughly $12 billion to $20 billion depending on definition and year,[13] but those mix in distribution and imports. We prefer the Census manufacturing figure and flag the difference.

4. The investable universe

Public exposure is concentrated in a short list, and only two names are essentially pure U.S. nitrogen bets. The table below is illustrative of scale, not a recommendation; market values move daily.

Major private and other owners:

• Koch Fertilizer (part of privately held Koch Industries) — the second-largest U.S. producer. In August 2024 Koch completed a ~$3.6 billion purchase of OCI Global's Wever, Iowa complex, one of the world's largest fertilizer plants (~3.5 million metric tons of nitrogen and DEF capacity).[21]
• Proman (Switzerland/Trinidad, private) — a top exporter of UAN and ammonia into the U.S. from Trinidad.[22]
• OCI Global — has largely exited U.S. nitrogen (sold Wever to Koch; sold its Texas clean-ammonia project).[21]
• Incitec Pivot / Dyno Nobel (Australia) — exited U.S. merchant production when it sold its Waggaman, Louisiana ammonia plant to CF Industries for $1.675 billion in late 2023.[9]

Bottom line for a public-market investor: CF Industries is the cleanest listed proxy for U.S. nitrogen; Nutrien offers nitrogen inside a diversified ag package; CVR Partners and LSB are smaller, higher-beta plays; and much of the industry's capacity sits with private Koch and offshore suppliers you cannot buy.

5. How the money works

Owners here do not sell a differentiated product — ammonia is ammonia. They make money on spread and utilization, and the metrics that matter are specific to a commodity chemical producer:

The gas-to-nitrogen spread. A ton of ammonia takes roughly 30-36 mmBtu (million British thermal units) of natural gas,[2] which is both the feedstock and the fuel. Gas represented approximately 34% of CF Industries' total production cost in 2025, making it the largest and most volatile manufacturing-cost component.[6] The whole game is: global nitrogen selling price minus (gas cost + fixed conversion cost). When Henry Hub (the U.S. gas benchmark) trades cheap while European TTF gas is expensive, U.S. plants earn fat margins and can export the surplus. When gas spikes or nitrogen prices fall, margins compress fast.

The cycle can be violent. USGS's Gulf Coast ammonia average rose from $578 per short ton in 2021 to $1,070 in 2022, then fell to $470 in 2023 and an estimated $450 in 2025.[7] USDA found that anhydrous-ammonia prices exceeded $1,600 per ton and urea exceeded $1,000 during the 2022 peak.[23]

Selling prices, per product, per ton. Producers report and are valued on realized prices for each product. CF Industries' 2025 results show the mechanism: UAN's average selling price rose to $311/ton in 2025 from $248/ton in 2024 (up 29% in segment sales) as global supply disruptions in Egypt, Iran, and Russia tightened the market.[6] A benchmark investors watch is the NOLA (New Orleans) barge price for urea and UAN, the pricing hub where domestic product competes with imports.

Margins vary by product and producer. CF Industries' 2025 gross margins illustrate why upgrade mix matters: 47.0% for granular urea, 42.6% for UAN, 31.3% for ammonia, and 18.8% for ammonium nitrate.[6] By contrast, LSB Industries reported a 17.0% consolidated gross margin in 2025; its mix includes industrial products, turnaround expense, and smaller plants.[17]

Capacity utilization / operating rate. These plants are enormous fixed-cost assets, so keeping them full is everything. In 2024-25 the U.S. fleet ran at about 80% of rated capacity on average,[7] while best-in-class CF Industries ran gross ammonia utilization near 97% in 2025[2] — that gap between average and best is where cost leadership shows up. Operating rates have high leverage because labor, depreciation, maintenance staff, and much plant overhead remain after an outage. Turnarounds create lumpy earnings and working capital. Weather can simultaneously shut gas supply or plants, interrupt barges, and compress the farmer's application window.

Profit and cash metrics. Investors track EBITDA (earnings before interest, taxes, depreciation, and amortization) per ton and free cash flow rather than same-store or occupancy-type measures. CF Industries earned $1.05 billion net income and $2.07 billion adjusted EBITDA in the first nine months of 2025 on $7.08 billion of full-year net sales and $2.72 billion gross margin,[14][6] and posted $615 million net earnings in Q1 2026 as global nitrogen stayed tight.[6] For MLPs like CVR Partners, the payoff comes as variable cash distributions to unitholders that swing with the cycle, not a steady dividend.

A newer cash lever: carbon credits. Producers that capture and permanently store the CO2 their plants emit can now earn the federal Section 45Q tax credit per ton sequestered. CF Industries expects its Donaldsonville, Louisiana carbon-capture project to lift free cash flow by roughly $100 million a year and yield ~1.9 million tons of "low-carbon" ammonia annually.[24]

6. What drives demand

• Corn acreage above all. Corn consumes about 78% of U.S. nitrogen,[1] so planted corn acres are the demand thermostat. USGS reported 38.5 million hectares (~95 million acres) of U.S. corn planting for crop-year 2025, 5% above the preceding crop year.[7] USDA Prospective Plantings indicated growers intend roughly 95.3 million acres in 2026, tilting slightly lower as tighter margins and high fertilizer costs nudge some acres to soybeans, which need far less nitrogen.[25]
• Application rate. Corn takes roughly 152 pounds of nitrogen per acre (2024 trend), a figure that has crept up over two decades with higher yields.[1]
• Fertilizer is a major cost but non-negotiable. Since 2020, fertilizer has represented 33–44% of corn operating costs and 34–45% of wheat operating costs, reinforcing both its necessity and farmers' incentive to economize when prices spike.[23]
• Crop and rotation economics. The corn-vs-soybean price ratio, and whether a field is planted "corn-on-corn," swing nitrogen demand year to year. Soybeans biologically fix much of their nitrogen and require minimal nitrogen fertilizer.[26]
• Global grain and biofuel demand. Export demand for U.S. grain and corn's role as ethanol feedstock underpin long-run acreage.
• Global nitrogen supply shocks. Because nitrogen is globally traded, outages and export policy abroad — Russia, China, Egypt, Iran — move U.S. prices as much as domestic demand does.[6]
• Industrial demand. The non-fertilizer ~12% — explosives (ammonium nitrate), plastics, refrigerants, and DEF — adds a steadier baseload.[7]
• Efficiency as a secular headwind to volume. Precision guidance, soil mapping, and variable-rate application can reduce overlaps and overapplication. In 2023, autosteering was used by 70% of large-scale crop-producing farms and yield or soil mapping by 68%, although adoption was materially lower on small farms.[27] This is a headwind to tons per acre but not necessarily to producer value.
• Low-carbon ammonia as prospective new demand. The largest prospective new demand pool is low-carbon ammonia for conventional fertilizer, power, marine fuel, hydrogen transport, and industrial decarbonization. CF's proposed Blue Point joint venture has nameplate capacity of approximately 1.4 million metric tons.[24] This is not yet equivalent to proven bulk fertilizer demand — carbon-accounting rules, sequestration infrastructure, and willingness to pay a "green premium" remain investment risks.

7. Regulation

Nitrogen manufacturing is regulated at both ends — the plant and the field:

• Environmental (water). The biggest long-run policy overhang is nutrient runoff. Nitrogen washing off farmland feeds the Gulf of Mexico "dead zone." The U.S. Environmental Protection Agency (EPA) works through the Clean Water Act — reviewing state numeric nutrient standards, setting TMDLs (Total Maximum Daily Loads, or pollution caps for a waterway), and setting drinking-water nitrate limits — and co-leads a federal-state Hypoxia Task Force.[28] So far controls on farm runoff are mostly voluntary rather than mandatory,[28] but tighter rules are a persistent risk to demand, not to the manufacturers directly. Wastewater from manufacturing is governed through federal effluent guidelines and NPDES or pretreatment permits.[8]
• Environmental (air/carbon). Ammonia plants are large greenhouse-gas and criteria-pollutant emitters. Plants report process carbon dioxide and combustion emissions under EPA's Greenhouse Gas Reporting Program (Subpart G).[29] They are subject to Clean Air Act permitting; decarbonization is now a capital-planning issue (see Section 45Q above).
• Safety and security. Anhydrous ammonia is toxic and hazardous, and ammonium nitrate is an explosives precursor, so plants fall under OSHA Process Safety Management (PSM), EPA risk-management rules, DOT transport rules, and DHS chemical-security programs. Facilities holding more than 10,000 pounds of anhydrous ammonia in a process are generally subject to EPA Risk Management Program requirements; the farm-use exemption does not extend to fertilizer manufacturers or suppliers.[30] The industry's memory of ammonium-nitrate disasters keeps safety compliance costs high.
• Trade. Import policy is a live wire. In 2022 the U.S. International Trade Commission investigated UAN imports from Russia and Trinidad and Tobago under antidumping and countervailing-duty provisions but concluded that imports had not materially injured or threatened the U.S. industry, so no AD/CVD orders followed.[31] More recently, 2025 tariff policy whipsawed: a 15% reciprocal tariff on nitrogen fertilizer imposed in April 2025 was removed for Trinidadian ammonia, urea, and UAN by executive order on November 14, 2025,[32] and most fertilizers were exempted from a further February 2026 tariff round[32] — reflecting a policy tug-of-war between protecting domestic producers and keeping farmers' input costs down.
• Tax credits. Federal energy-tax policy directly shapes clean-ammonia economics. The 2025 "One Big Beautiful Bill Act" terminated the Section 45V clean-hydrogen credit for 2026 but retained Section 45Q for carbon capture[33] — a swing that favors capture-and-store retrofits over green-hydrogen ammonia.

8. Competitive dynamics and consolidation

This is a textbook oligopoly. Federal concentration data for NAICS 325311 show the top 4 firms holding 77.5% of receipts, the top 8 holding 89.4%, the top 20 holding 95.4%, and the top 50 holding 99.3% — from a base of just 122 firms.[10] (The Herfindahl-Hirschman Index, the standard concentration gauge, is suppressed in the federal release for this code.[10])

Barriers to entry are steep: a new world-scale plant costs $1 billion to $4 billion and takes years to permit and build,[3][4] and it must sit on cheap gas with barge/rail/pipeline logistics. Domestic pricing is nonetheless capped by imports — U.S. product competes at NOLA against ammonia and UAN from Canada, Trinidad, and elsewhere, so producers are price-takers on the upside even as concentration protects them on the downside.

Consolidation has been the defining trend:

• 2010 — CF Industries acquired Terra Industries, cementing its North American lead.
• 2018 — PotashCorp and Agrium merged to form Nutrien, the world's largest crop-nutrient company and third-largest nitrogen producer; U.S. antitrust regulators required a nitrogen-plant divestiture.[34]
• 2023 — CF Industries bought the Waggaman, Louisiana ammonia plant from Australia's Incitec Pivot for $1.675 billion.[9]
• 2024 — Koch bought OCI Global's Wever, Iowa complex for ~$3.6 billion in August, cementing Koch as the clear No. 2 and shrinking the field of independent owners further.[21]

New capacity is endogenous to the cycle: high margins encourage construction, but long lead times mean supply often arrives after the market has turned. CF notes that added capacity helped drive its average selling price from $314 per ton in 2015 to $207 in 2017.[6]

The through-line: capacity keeps concentrating into fewer, larger hands, and foreign entrants (Incitec, OCI) have generally exited U.S. merchant production.

9. Risks

• Natural-gas price spikes. Gas is the dominant cash cost;[2] a sustained rise crushes margins and can idle high-cost plants. The Texas freeze in February 2021 cut Texas natural-gas production by 45% and total U.S. production by 21%, disrupting both feedstock and outbound logistics.[35]
• Commodity cyclicality. Nitrogen prices are volatile and globally set; a demand or supply swing can halve or double margins in a year.[6]
• Corn-acreage swings. Because corn drives demand, a shift toward soybeans softens volumes and price.[25]
• Import and trade competition. Low-cost imports cap domestic pricing; China's export policy, European gas availability, sanctions, tariffs, and outages in exporting regions can move North American prices faster than domestic crop fundamentals.[7]
• Substitution at the product level. USGS states that nitrogen is an essential plant nutrient with no substitute.[7] But that does not mean a producer has no substitution risk: farmers can switch among ammonia, urea, and UAN; use manure; rotate into nitrogen-fixing legumes; improve timing and placement; or plant less nitrogen-intensive crops. Product form is therefore substitutable even though the nutrient is not.
• Global oversupply. New low-cost capacity abroad and Chinese export policy can flood the seaborne market and depress prices.[7]
• Decarbonization capital. Meeting carbon rules and building CCS or clean-ammonia capacity is expensive, and the payoff depends on tax credits that can be legislated away (as 45V was).[33]
• Safety and environmental liability. Toxic ammonia inventories, high pressures, combustible gas, and nitric-acid operations create low-frequency, high-severity risks involving injury, evacuation, environmental liability, and prolonged outages.
• Labor constraints. Labor is a smaller cost than gas but a potentially binding operational constraint. USGS estimates the ammonia subset employed approximately 1,600 plant workers in 2025, underscoring capital intensity.[7] Operators need process-control, engineering, maintenance, and safety expertise; LSB reports that approximately 28% of its employees are under collective-bargaining agreements.[17]
• Policy whiplash. Tariffs, tax credits, and runoff rules all shift with politics, making long-lived plant investments hard to underwrite.

10. How to invest and the outlook

Public-market routes.

• Pure-play: CF Industries (NYSE: CF) is the most direct listed exposure to U.S. nitrogen — leader on scale, cost, and utilization, though it has Canadian and British operations and industrial end uses.[6][14]
• Diversified: Nutrien (NYSE/TSX: NTR) bundles nitrogen with potash, phosphate, and a large farm-retail network, muting nitrogen's swings.[15]
• Higher-beta / income: CVR Partners (NYSE: UAN) is a small MLP paying variable, cycle-linked cash distributions, with partnership tax reporting and controller/governance considerations; LSB Industries (NYSE: LXU) is a small-cap producer with greater single-plant, leverage, and industrial-product risk.[17][18] Global major Yara (OTC: YARIY) offers ex-U.S. nitrogen exposure.[19]
• Reserve valuation work (dividend yields, EV/EBITDA multiples, distribution coverage) for these names specifically — the group trades on where it sits in the nitrogen cycle, so entry timing matters more than in steadier industries.

Private routes. Direct ownership is largely closed to outside capital — the biggest independent, Koch Fertilizer, is inside privately held Koch Industries,[21] and world-scale greenfield plants are club-sized commitments (CF's Blue Point project in Louisiana is a joint venture with Japan's JERA and Mitsui).[24] The $3.6 billion Koch-Wever transaction demonstrates that world-scale assets can trade at multi-billion-dollar values, but one transaction cannot establish a sector multiple. Private and institutional investors more often gain exposure through project finance, offtake and supply agreements, infrastructure/logistics assets (terminals, barges), or private credit to producers, rather than through equity in a new plant.

Common analytical traps. Several recurring claims deserve rejection. "Fertilizer" is not a single commodity: nitrogen economics differ fundamentally from mined phosphate and potash, and Mosaic is therefore not a direct nitrogen-manufacturing exposure. A Census establishment is not an ammonia plant or a company. Product tons cannot be compared without adjusting for nutrient content. Cheap U.S. gas does not guarantee high margins because the selling price is globally determined.

Near-term drivers (forward-looking). Tight global nitrogen supply carried strong pricing into 2026, and CF's Q1 2026 earnings suggest the up-cycle had not yet broken.[6] The swing factors to watch: U.S. natural-gas prices (the cost floor), 2026 corn acreage (the demand thermostat, tilting slightly lower),[25] the on-again/off-again tariff regime on imports,[32] and the pace of clean-ammonia investment now that 45Q survives but 45V does not.[33] The structural case — cheap U.S. shale gas plus a consolidated, import-capped market — remains intact; the cyclical case depends, as always, on where gas and grain prices go next. These are judgments about an inherently volatile commodity, not guarantees.

---

Sources

1. farmdoc daily (University of Illinois), "Trends in Fertilizer Use and Efficiency in the U.S.," 2025. https://farmdocdaily.illinois.edu/2025/05/trends-in-fertilizer-use-and-efficiency-in-the-us.html
2. Society of Petroleum Engineers / CF Industries, "Gas as fertilizer feedstock" and "Key Questions About Fertilizer and Its Price," 2025-2026 (natural gas ~70%+ of ammonia variable cost; ~30-36 mmBtu/ton; CF ~97% 2025 utilization). https://onepetro.org/spe/general-information/1622/Gas-as-fertilizer-feedstock; https://www.cfindustries.com/newsroom/2026/2026-fertilizer-prices-faq
3. C&EN (American Chemical Society), "OCI to sell US clean ammonia project," 2024 (~$1B for ~1.1 Mt plant). https://cen.acs.org/energy/hydrogen-power/OCI-sell-US-clean-ammonia/102/i25
4. Agriculture Dive, "Koch completes controversial $3.6B fertilizer plant acquisition," 2024. https://www.agriculturedive.com/news/koch-oci-fertilizer-plant-sale-wever-iowa/725901/
5. U.S. Census Bureau, North American Industry Classification System (NAICS) 2022, code 325311 and related fertilizer codes. https://www.census.gov/naics/?details=325&input=325&year=2022
6. CF Industries Holdings, Inc., 2025 Form 10-K (net sales ~$7.08B; UAN ASP $311/ton 2025 vs $248 2024; ~40% NA ammonia capacity; 10.1M product tons gross ammonia; segment gross margins; gas ~34% of production cost; Q1 2026 net earnings $615M; capacity addition price impact). https://www.sec.gov/Archives/edgar/data/1324404/000132440426000007/cf-20251231.htm
7. U.S. Geological Survey, "Nitrogen (Fixed)—Ammonia," Mineral Commodity Summaries 2025 and 2026 (U.S. production ~13.6 Mt 2024 / ~14 Mt 2025; ~88% fertilizer use; net import reliance ~5%; imports Canada 49%/Trinidad 47% 2021-24; ~57% capacity in LA/OK/TX; 18 companies, 38 plants; Gulf Coast ammonia prices $578/2021, $1,070/2022, $470/2023, $450/2025; 1,600 ammonia workers). https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-nitrogen.pdf; https://pubs.usgs.gov/periodicals/mcs2025/mcs2025-nitrogen.pdf
8. U.S. Environmental Protection Agency, Fertilizer Manufacturing Effluent Guidelines (process condensate, blowdown, leaks, runoff as principal waste streams). https://www.epa.gov/eg/fertilizer-manufacturing-effluent-guidelines
9. C&EN (American Chemical Society), "CF Industries buying Louisiana ammonia plant," 2023 ($1.675B Waggaman acquisition from Incitec Pivot/Dyno Nobel). https://cen.acs.org/business/mergers-&-acquisitions/CF-Industries-buying-Louisiana-ammonia/101/i10
10. U.S. Census Bureau, Economic Census 2022, Concentration Ratios / receipts for NAICS 325311 (receipts $15.0B; 122 firms; CR4 77.5%, CR8 89.4%, CR20 95.4%, CR50 99.3%; HHI suppressed). https://www.census.gov/programs-surveys/economic-census.html
11. U.S. Census Bureau, County Business Patterns 2023, NAICS 325311 (194 establishments; 7,033 employees; annual payroll $881.0M; Q1 payroll $286.7M). https://www.census.gov/programs-surveys/cbp.html
12. U.S. Small Business Administration, Table of Small Business Size Standards, 2023 (NAICS 325311 = 1,050 employees). https://www.sba.gov/document/support-table-size-standards
13. Precedence Research / Astute Analytica, "U.S. Nitrogenous Fertilizer Market" size estimates, 2025 (range ~$12B-$20B by definition). https://www.precedenceresearch.com/us-nitrogenous-fertilizer-market
14. CF Industries, "Reports First Nine Months 2025 Net Earnings of $1.05 Billion, Adjusted EBITDA of $2.07 Billion," 2025. https://ir.cfindustries.com/Investors/news/news-details/2025/CF-Industries-Holdings-Inc--Reports-First-Nine-Months-2025-Net-Earnings-of-1-05-Billion-Adjusted-EBITDA-of-2-07-Billion/default.aspx
15. Nutrien Ltd., Form 40-F FY2025 and company overview (nitrogen nameplate capacity >7M t; third-largest nitrogen producer). https://www.sec.gov/Archives/edgar/data/1725964/000119312526081326/d56746dex991.htm; https://www.nutrien.com/about/our-business/nitrogen
16. companiesmarketcap.com / Zacks, Nutrien market capitalization ~$29B, 2026. https://finance.yahoo.com/markets/stocks/articles/zacks-industry-outlook-nutrien-cf-072800115.html
17. LSB Industries, Inc., 2025 Form 10-K (fifth-largest U.S. ammonia producer; plants in Cherokee AL, El Dorado AR, Pryor OK; 927,000 tons combined annual ammonia capacity; 17.0% consolidated gross margin; ~28% employees under collective bargaining). https://www.sec.gov/Archives/edgar/data/60714/000119312526076810/lxu-20251231.htm
18. CVR Partners, LP, Form 10-K (NYSE: UAN; two plants Coffeyville KS and East Dubuque IL; ~10.6M units; ~$566M non-affiliate float; CVR Energy subsidiaries hold ~36.8% of LP interests; UAN ~67% / ammonia ~24% of 2025 net sales). https://www.sec.gov/Archives/edgar/data/1425292/000142529226000011/cvi-20251231.htm
19. Zacks / companiesmarketcap.com, market caps for Mosaic (~$11.3B) and Yara (~$9.2B), 2026. https://finance.yahoo.com/news/zacks-industry-outlook-highlights-cf-090400058.html
20. Yara International, "Yara acquires Gulf Coast Ammonia plant," July 2026 ($1.3B acquisition agreement for Texas City facility). https://www.yara.com/corporate-releases/yara-acquires-gulf-coast-ammonia-plant/
21. Koch Ag & Energy Solutions, "Koch Ag & Energy Solutions Completes Acquisition of Wever, Iowa," August 2024 (~$3.6B; ~3.5 Mt nitrogen + DEF capacity; Koch second-largest U.S. producer). https://kochfertilizer.com/newsroom/koch-ag-energy-solutions-completes-acquisition-of-wever-iowa
22. Proman / Ministry of Foreign Affairs, Trinidad & Tobago, "Proman welcomes removal of U.S. tariffs on critical fertilizers," 2025 (Proman a leading UAN exporter to the U.S.). https://www.proman.org/news/proman-welcomes-removal-of-u-s-tariffs-on-critical-fertilizers/
23. USDA Economic Research Service, "Drivers of Fertilizer Markets" and Charts of Note, March 2025 (fertilizer 33–44% of corn operating costs, 34–45% of wheat; 2022 peak prices ammonia >$1,600/ton, urea >$1,000). https://www.ers.usda.gov/data-products/charts-of-note/111221; https://www.ers.usda.gov/sites/default/files/_laserfiche/publications/113324/ERR-354.pdf
24. CF Industries, "Start-up of Donaldsonville Complex CO2 Dehydration and Compression Unit" and "Blue Point Complex," 2025 (~1.9 Mt low-carbon ammonia; ~$100M/yr free-cash-flow uplift from 45Q; Blue Point JV with JERA and Mitsui, ~1.4 Mt nameplate). https://www.cfindustries.com/newsroom/2025/donaldsonvilleccs; https://ir.cfindustries.com/Investors/news/news-details/2025/CF-Industries-Announces-Joint-Venture-with-JERA-Co--Inc--and-Mitsui--Co--Inc--for-Production-and-Offtake-of-Low-Carbon-Ammonia/default.aspx
25. American Farm Bureau Federation / USDA Prospective Plantings & IndexBox, 2026 (2025 corn ~98.8M acres; 2026 intended ~95.3M, down ~3%; ~152 lb N/acre). https://fb.org/market-intel/prospective-plantings-report-provides-first-look-at-acreage-intentions; https://www.indexbox.io/blog/us-corn-acreage-projected-to-decline-in-2026-amid-rising-production-costs/
26. USDA Economic Research Service, Soybeans and Oil Crops Sector Overview (soybeans biologically fix nitrogen, require minimal nitrogen fertilizer). https://www.ers.usda.gov/topics/crops/soybeans-and-oil-crops/oil-crops-sector-at-a-glance
27. USDA Economic Research Service, "Precision Agriculture in U.S. Farming," December 2024 (autosteering 70%, yield/soil mapping 68% on large farms, 2023). https://www.ers.usda.gov/data-products/charts-of-note/110550
28. U.S. Environmental Protection Agency, "The EPA's Ongoing Efforts to Reduce Nutrient Pollution" and Hypoxia Task Force materials, 2024-2025 (Clean Water Act nutrient standards, TMDLs, ~45% loading-reduction recommendation, largely voluntary). https://www.epa.gov/nutrientpollution/epas-ongoing-efforts-reduce-nutrient-pollution
29. U.S. Environmental Protection Agency, Greenhouse Gas Reporting Program Subpart G (ammonia manufacturing emissions reporting). https://www.epa.gov/ghgreporting/subpart-g-ammonia-manufacturing
30. U.S. Environmental Protection Agency, Risk Management Program guidance for ammonia (10,000-lb threshold; farm-use exemption does not extend to manufacturers). https://www.epa.gov/sites/default/files/2013-11/documents/appendix-e-final.pdf
31. U.S. International Trade Commission, Investigations Nos. 701-TA-668-669 and 731-TA-1565-1566 (UAN from Russia and Trinidad & Tobago), 2022 (no material injury finding; no AD/CVD orders issued). https://www.usitc.gov/keywords/trinidad_and_tobago
32. QC Intel / Farm Policy News (Univ. of Illinois), "US removes 15% import tariff on Trinidad's ammonia, nitrogen fertilisers" and "Beef, Most Fertilizers Exempt from New Trump Tariffs," 2025-2026 (Executive Order Nov 14, 2025; Feb 2026 fertilizer exemptions). https://www.qcintel.com/ammonia/article/us-removes-15-import-tariff-on-trinidad-s-ammonia-nitrogen-fertilisers-53062.html; https://farmpolicynews.illinois.edu/2026/02/beef-most-fertilizers-exempt-from-new-trump-tariffs/
33. The Center Square, "'Big, beautiful bill' kills hydrogen production credit, keeps carbon capture credit," 2025 (Section 45V terminated for 2026; Section 45Q retained). https://www.thecentersquare.com/louisiana/article_bd79fa60-247e-4dbc-a81f-1a2490daf70d.html
34. Nutrien / PR Newswire, "Agrium and PotashCorp Merger Completed Forming Nutrien," 2018 (merger effective Jan. 1, 2018; FTC-required nitrogen-plant divestiture). https://www.nutrien.com/news/press-releases/agrium-and-potashcorp-merger-completed-forming-nutrien-a-leader-in-global-agriculture-1551
35. USDA Economic Research Service, "Drivers of Fertilizer Markets," ERR-354 (February 2021 Texas freeze cut TX gas production 45%, U.S. production 21%). https://www.ers.usda.gov/sites/default/files/_laserfiche/publications/113324/ERR-354.pdf