Corn / Maize

First, the two names. Maize is the global and scientific name, from the Taino word mahiz by way of Spanish, and it is what most of the world, including Britain, the rest of Europe, Africa, and the UN agencies, calls the crop. Corn is the North American name (also used in Australia), and it is an accident of an older meaning: in English "corn" simply meant the leading local grain, wheat in England, oats in Scotland, so when settlers met this new American plant they called it "Indian corn" and then just "corn." The other grains never split this way because they are Old World crops with long-settled single names; maize was a New World import that arrived carrying an indigenous name while colliding with an English word that already meant "grain," and ended up with one of each. This sheet uses corn and maize interchangeably.

Corn is the largest grain crop on the planet, with global production of roughly 1.25 billion tonnes a year, and the CBOT corn future is the most liquid agricultural contract in the world. The United States grows the biggest single crop, a record harvest of 17.0 billion bushels in 2025, but corn's demand profile has changed completely since the 2000s: roughly 40 percent of the US crop now goes to ethanol plants rather than feed troughs, a direct result of the Renewable Fuel Standard mandates passed in 2005 and 2007. That single policy turned corn into an energy commodity, tying its price to gasoline demand and crude oil, and it is why the corn market watches EIA ethanol production data alongside USDA crop reports.

The export map has been redrawn by Brazil. The safrinha, Brazil's second corn crop planted into soybean stubble in January and February and harvested mid-year, now accounts for roughly three quarters of Brazilian corn production and turned the country into the world's largest corn exporter in the 2022/23 season, a position the US had held for most of the previous six decades; the US retook the lead from the 2023/24 season on big harvests, with Brazil a close second. China's import appetite, which exploded to roughly 28 million tonnes in 2020/21 before retreating, and Ukraine's war-disrupted Black Sea exports complete the trade picture. Argentina remains a top-three exporter.

Corn futures trade in March, May, July, September, and December, and the July-December old-crop/new-crop spread is the market's scoreboard for tightness. In surplus years, like the period of roughly $4 per bushel prices that followed the large 2024 and record 2025 US harvests, the curve carries a storage-paying contango. In shortage years, 2012's drought being the modern benchmark, the old crop inverts sharply and prices ration demand. Daily price limits, currently set and reset periodically by the exchange, still halt trading in extreme moves, as they did repeatedly after Russia invaded Ukraine in February 2022.

Through the growing season the market trades the calendar of the plant itself, tracked in the USDA's weekly Crop Progress report. For corn the milestones run planted, emerged, silking, dough, dented, mature, and harvested, alongside a condition rating from very poor to excellent, and traders watch each one against the five-year average: a slow planting pace or silking into a July heat dome can move the price on its own. Agronomists use a more precise scientific scale, the V (vegetative) and R (reproductive) stages, where R1 is silking and R6 is maturity, but the USDA's plain-language milestones are what the futures market reacts to every Monday afternoon from spring through harvest.

No ritual captures the season better than the crop tour. Every August, scouts on the Pro Farmer Midwest Crop Tour fan out across the Corn Belt, from Ohio to Nebraska, stop at preset fields, and physically count: ear population and grain length for corn, pods in a three-foot-by-three-foot square for soybeans, plugging the numbers into a yield formula. The tour draws not just agronomists but grain merchants, brokers, fund managers, and journalists, because being able to say "I was in the field" carries a credibility no satellite map does, and a separate Wheat Quality Council tour does the same through Kansas wheat each May. The running joke is the gap between the city analyst in spotless designer wellington boots and the farmers whose fields are being judged, and farmers handle the spectacle with a mix of hospitality and mischief. Because the tour drives roughly the same routes year after year, there is an old Corn Belt wisecrack that the smart farmer plants his best, thickest seed in the rows nearest the road, so the windshield survey, and the scout who stops there, comes away convinced the whole county looks magnificent. The fields well off the blacktop tell the real story, which is exactly why the scouts get out and walk.

How the crop is grown is itself changing, in two ways worth knowing. The first is short-stature corn: hybrids bred to stand only about seven feet tall, roughly a third shorter than the familiar ten-to-twelve-foot crop. Bayer's Preceon system reached commercial launch in 2025 (with a biotech version due around 2027), Stine Seeds pioneered the idea decades earlier, and Corteva has its own program. The point is not, as is sometimes said, that a shorter plant wastes less energy on stalk and puts more into the ear; the real driver is standability. A short, thick-stalked plant resists the wind that flattens, or "lodges," tall corn, and that lets a farmer plant far more seeds per acre and drive equipment through the field later in the season to apply nitrogen or fungicide, so the yield gain comes from more plants reliably making an ear, not from redirecting energy.

The second shift is below ground, and it spans corn, soybeans, and wheat alike. No-till farming, planting straight into last year's residue instead of plowing, took off after herbicides made the plow optional, and accelerated with herbicide-tolerant crops from 1996; roughly a third of US cropland is now no-till, and about half is no-till or reduced-till. It cuts erosion sharply, saves fuel and labor, holds soil moisture, and builds soil carbon, which is why it is talked about more than ever in the age of carbon credits and "regenerative" agriculture, though the durability of soil-carbon claims is still debated. Alongside it come cover crops, off-season plantings like cereal rye, clover, or radish grown between cash crops to hold the soil, fix or scavenge nitrogen, and suppress weeds. These are usually not harvested: they are killed off by winter, herbicide, or a roller-crimper and left as a mulch, or sometimes grazed, because the payoff is the soil, not a sale. And you do not strictly need them, which is the catch in their slow uptake: they are a soil-health practice, not a required input, with an immediate cost of fifty to eighty dollars an acre, no direct revenue, and benefits that accrue over years, so despite cost-share and carbon programs US cover-crop acreage sat near five percent of cropland in 2022.

Once harvested, corn is stored dry and in bulk, which is where silos and elevators come in, and the two words describe different things. A silo is the tall storage cylinder itself; a grain elevator is the whole facility that receives grain, lifts it, weighs it, stores it in those silos, and loads it onto trucks, rail, or barges. The name comes from the machine at its heart, the bucket elevator, a vertical conveyor that scoops grain up to the top of the structure so it can flow down into a bin; the first steam-powered one was built in Buffalo in 1842, and the term came to mean the building. The same elevators handle soybeans, wheat, sorghum, and rice, because all are hard, dry, free-flowing grains and oilseeds that pour like a liquid. As for whether the bottom gets crushed: not really. Grain is stored at around 14 percent moisture and the kernels are hard, so the lower layers compact and some kernels break into "fines" that settle at the center, but they do not pulp; and a quirk of physics called the Janssen effect means the silo walls, through friction, carry much of the weight, so the floor never bears the full crushing load of the column above. The real hazards are spoilage, dust explosions, and workers being engulfed in flowing grain, not the grain crushing itself. (That wall-friction physics was only formalized by the engineer H.A. Janssen in 1895, decades after the first elevators, though granary builders had long sensed it.) Keeping the grain dry and sealed matters as much as bearing its weight: bins are aerated to hold moisture down and closed against rodents and insects, because the enemies of stored grain are spoilage and pests, not gravity. And when a bumper harvest fills every bin, as in the record US crops of the 2010s, the overflow is simply heaped outdoors in vast tarped ground piles, or sealed into long plastic silo bags in the field, until it can move.

You still see grain in sacks, and that is about who is buying it. Bulk handling, elevator to rail to bulk carrier, is the cheap way to move millions of tonnes between countries, so internationally traded corn, wheat, and soybeans travel loose in bulk. Bags come in at the last mile and the small buyer: retail and consumer sale, food aid (the printed USAID and WFP sacks), developing-country trade without bulk infrastructure, and seed. Rice is the most bag-oriented of the grains because it is largely a direct human food sold close to the consumer, often by named variety, where a 25 or 50 kilogram bag is the natural unit.

Getting the bulk crop to port is its own logistics epic, and in the US it floats. Most corn and soybeans bound for export move down the Mississippi River by barge: a single jumbo hopper barge carries about 1,500 tonnes, roughly 16 rail cars or 70 trucks, and a towboat pushes some fifteen of them at once, so one tow moves what would take a thousand trucks. Around 60 percent of US grain exports flow to the Gulf of Mexico export elevators near New Orleans, the largest grain-export hub on earth, which is why a low-water Mississippi, as in the droughts of 2022 and 2023, lightens every barge and ripples back into the price a farmer is offered a thousand miles upstream. From the Gulf and the Pacific Northwest the grain crosses the world in dry-bulk carriers, threading the same chokepoints, the Panama Canal, the Turkish Straits out of the Black Sea, that the freight market lives and dies by.

One clarification surprises people: the corn in this market is not the corn on your dinner plate. Almost all of it, about 99 percent of US acreage and the deliverable grade of the CBOT contract, is field corn, specifically yellow dent corn, named for the dimple in its hard, dried, starchy kernel. Sweet corn, a different variety picked young and immature when a genetic quirk keeps its kernels full of sugar before it turns to starch, is grown on barely one percent of the acreage. Yet it is essentially all the corn people eat as corn: the cobs at a roadside farm stand, the ears in the supermarket, and the canned and frozen "niblets" are all sweet corn, a fresh vegetable sold like produce with no futures market of its own. Why not feed animals sweet corn, or feed people the field corn? Because each is bred for the opposite thing. Sweet corn is low-yielding, perishable, and expensive, bred for sugar and flavor, while animals and ethanol plants want the cheapest possible starch and energy per acre, which is exactly what high-yielding dent corn delivers. And people do eat enormous amounts of field corn, just never on the cob: it is too hard and bland fresh, so it is milled and processed into cornmeal, masa for tortillas, corn syrup, starch, grits, and corn flakes. Sweet corn is the vegetable; dent corn is the grain.

There is even a prized disease. Huitlacoche, a fungus (Ustilago maydis) that infects the ear and swells the kernels into grey-black galls, is corn smut, a blight American farmers spray to prevent, but in Mexico it is a delicacy, sometimes called the Mexican truffle and folded into quesadillas and soups, worth far more by weight than the corn it ruins. It mostly appears opportunistically on infected ears, but its gourmet value is now high enough that some growers deliberately inoculate corn to produce it.