Reviewed September 2026 against USDA Agricultural Marketing Service weekly fertilizer pricing and USDA Economic Research Service fertilizer-use data.

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NPK 20-20-20 is a balanced water-soluble fertilizer carrying 20% nitrogen, 20% phosphate (P₂O₅) and 20% potash (K₂O) by weight — the “2 1 2” or “2-2-2” shorthand some growers use refers to the same equal-ratio idea at a lower concentration, such as 2-2-2 or 10-10-10 blends. CAN (calcium ammonium nitrate) is a granular nitrogen source used where a fast, low-scorch-risk nitrogen application is needed. Below: what each ratio is actually for, what US blends cost per ton right now, and where liquid fertilizer fits into a fertigation or foliar program.

What NPK Ratios Actually Mean

Every fertilizer bag prints three numbers — N-P-K — as the percentage of nitrogen, phosphate, and potash by weight. A 20-20-20 blend is 20% each; a 2-2-2 or 10-10-10 blend follows the same 1:1:1 ratio at lower concentration, meaning you’d apply roughly twice the product volume of a 10-10-10 to deliver the same nutrient load as a 20-20-20. Balanced ratios like these are general-purpose feeds for crops without a known deficiency in one specific nutrient.

For US corn specifically, nitrogen is the dominant input. USDA NASS’s Agricultural Chemical Use Program measured average nitrogen application on US corn at 151.8 lbs/acre in 2024, while University of Illinois farmdoc daily calculates that corn needs roughly 0.85 lbs of nitrogen per bushel produced to reach current yield levels (farmdoc daily, May 2025). With 95.3 million acres of corn planted in the 2025 growing season per USDA NASS’s Agricultural Resources Management Survey, that per-acre rate scales into one of the largest nitrogen demand pools in US agriculture — which is also why NPK and straight-nitrogen prices swing the whole farm budget.

Uses of CAN Fertilizer

Calcium ammonium nitrate (CAN) delivers nitrogen in two forms at once — half nitrate, half ammonium — plus calcium carbonate as a filler that also buffers soil pH near the granule. That combination makes it a preferred nitrogen source in several specific situations:

• Cold-soil early-season topdressing — the nitrate fraction is plant-available immediately, unlike urea, which must first convert via urease enzymes that are slow in cold soil.
• Surface application without incorporation — CAN has a much lower volatilization (ammonia loss) risk than surface-applied urea, so it holds its nitrogen value better when rain doesn’t follow application within a day or two.
• Acid-sensitive fields — the calcium carbonate content offsets some of the acidifying effect that straight ammonium-nitrogen sources have on soil over repeated seasons.
• Split topdress programs on wheat and forage grasses — fast nitrate uptake supports quick green-up response, which is why CAN shows up often in small-grain and pasture topdressing programs.

The tradeoff: CAN runs roughly 27% nitrogen by weight (product-specific — check your bag), against urea’s 46%, so per-ton nitrogen delivered is lower and freight/spreading cost per unit of N is higher. That’s the standing reason growers reach for urea when soil is warm and moist enough for it to convert efficiently, and CAN when timing or surface-loss risk rules urea out.

US Fertilizer Prices Right Now

Fertilizer pricing moves weekly, so any number printed here is a snapshot, not a forecast. USDA’s Agricultural Marketing Service (AMS) publishes a weekly retail fertilizer report that is the standing reference for growers pricing out a program — bookmark it rather than this article for current numbers.

Full source: USDA Agricultural Marketing Service weekly fertilizer reports. These prices update every Thursday — a 20-20-20 or 18-18-18 quote you get from a supplier next month should be checked against that week’s AMS report before you sign a contract, not against the figures above.

USDA’s Economic Research Service projects US corn growers will spend $166/acre on fertilizer (all nutrients combined) in 2026 — a figure that moves with both nutrient prices and application rate, and is published as part of ERS’s fertilizer use and price data series, which also carries the historical rates behind that forecast.

Fertilizer NPK: Comparing Concentrations

“Fertilizer NPK” as a search usually means: which ratio and which concentration for which crop? A 20-20-20 water-soluble blend suits container crops, greenhouse production, and fertigation lines where uniform, fast-dissolving nutrition matters more than cost per unit of nutrient. Granular blends like 16-16-16 and 18-18-18 — the ones with published AMS pricing above — suit broadcast field application on row crops, where cost per ton of actual nutrient delivered is the driving number. Comparing them on a per-nutrient-unit basis (price ÷ (%N + %P + %K)) is the only fair way to shop across concentrations; a higher-priced-per-ton blend can still be cheaper per unit of nutrient delivered.

Liquid Fertilizer in Farming: Where It Fits

Liquid fertilizer — whether foliar-sprayed, soil-drenched, or run through a fertigation system — solves a different problem than granular blends: timing precision and mixing flexibility. It goes on exactly where and when the crop needs it, mixes cleanly with other liquid inputs in the same tank, and distributes more evenly across a field than a granular spreader pattern can guarantee at the edges.

What isn’t published: US-wide adoption figures for liquid versus granular fertilizer by crop or acreage. Market-size reports quantify liquid fertilizer in dollars, not in acres treated or percentage of total fertilizer volume — that breakdown by crop and application method isn’t itemized in USDA’s public datasets as of this review. If you need that number for a specific crop or region, the two working paths are a direct query to your state land-grant extension service (many track on-farm practice adoption at the county level) or USDA NASS’s Agricultural Resource Management Survey microdata, which asks practice-level questions but publishes them at an aggregate level rather than a clean “% liquid” figure.

Farmonaut’s satellite crop monitoring turns that timing question into a data-driven one rather than a calendar guess: NDVI and soil-moisture layers flag exactly which zones of a field are under stress before a visual symptom shows up, so a liquid or fertigation pass — including secondary-macronutrient corrections — targets the acres that actually need it instead of the whole field on a fixed schedule. Farm decision-making trends increasingly lean on exactly this kind of zone-level data rather than blanket application.

Explore Farmonaut’s Web App to see zone-level crop health data before your next liquid or granular application.

The US Secondary Macronutrients Market

Secondary macronutrients — calcium, magnesium and sulfur — sit outside the NPK label but are frequently co-applied through the same liquid or fertigation systems discussed above. Emergen Research sized the US secondary macronutrient market at $1.5 billion in 2024, projecting growth to $2.8 billion by 2034. Calcium is the largest single component, holding 45% of that 2024 market — consistent with its role in fruiting crops, where calcium deficiency shows up directly as blossom-end rot and cell-wall weakness. Full detail: Farmonaut’s secondary macronutrients market analysis, and background on how these nutrients function agronomically at essential plant nutrients: 7 keys to sustainable crops.

What’s not published at the per-acre level: application rates of sulfur, calcium and magnesium broken out by crop (corn, wheat, soybeans). USDA NASS’s more detailed secondary-nutrient surveys last had comprehensive published data for 2021 or earlier; there’s no annual per-acre series being maintained the way there is for nitrogen on corn. For a current rate on a specific crop, a state extension soil-fertility guide or a recent soil test interpretation from your land-grant university’s agronomy lab is the more current source than any national aggregate.

How Farmonaut Fits Into a Nutrient Program

Farmonaut’s satellite-based crop monitoring platform overlays NDVI vegetation health, soil moisture, and weather data on a field-by-field basis, letting growers see which zones are actually nutrient-stressed before yield loss locks in. That data feeds directly into fertigation timing decisions for both primary NPK and secondary macronutrient (Ca/Mg/S) applications.

Download Farmonaut’s Android App to start monitoring zone-level crop health for your next application cycle.

For developers and agribusinesses building nutrient-management tools on top of satellite data, Farmonaut’s API exposes the same crop-health layers used in the consumer app. Get Farmonaut’s iOS App for the same monitoring on iPhone.

NPK Blend Cost Calculator

Use current AMS blend and straight-nutrient prices to estimate your own per-acre fertilizer cost and compare a granular blend against buying urea, DAP and potash separately.

Assumptions: uses August 2026 / Q1–Q2 2026 USDA AMS blend prices as defaults; enter your own supplier quote in the override field for a current-week estimate. Excludes application/spreading cost, freight beyond the quoted basis, and any secondary-macronutrient additive cost.

FAQ

Q: What does NPK 2-2-2 or 20-20-20 mean?
A: Both describe a 1:1:1 ratio of nitrogen, phosphate (P₂O₅) and potash (K₂O) — 20-20-20 at 20% concentration of each, lower-numbered blends like 2-2-2 or 10-10-10 at proportionally less concentration per unit of product.

Q: What is CAN fertilizer used for?
A: Calcium ammonium nitrate supplies fast-available nitrate nitrogen with a low volatilization loss risk, making it a common choice for cold-soil topdressing, surface application without incorporation, and acid-sensitive fields, at roughly 27% nitrogen by weight versus urea’s 46%.

Q: How much does NPK fertilizer cost in the US right now?
A: USDA AMS priced 16-16-16 at $1,089.28/ton and 18-18-18 at $1,232.10/ton in August 2026; check the weekly AMS fertilizer report for the current week’s price before buying.

Q: What’s the advantage of liquid fertilizer over granular?
A: Liquid fertilizer allows precise, zone-targeted timing through foliar spray or fertigation, mixes directly with other liquid inputs, and distributes more uniformly across a field than a granular spreader pattern.

Q: How big is the US secondary macronutrient market?
A: Emergen Research sized it at $1.5 billion in 2024, projecting growth to $2.8 billion by 2034, with calcium holding 45% of the 2024 market.

Q: How much nitrogen does US corn actually need?
A: USDA NASS measured 151.8 lbs/acre applied in 2024; University of Illinois farmdoc daily calculates roughly 0.85 lbs of nitrogen is required per bushel of corn produced at current yield levels.

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