Field Notes

An Agricultural Implement Leaves Room for Good Judgment

Row-crop planters stopped getting wider in 2009 because of a highway rule, and the whole engineering contest moved into the hinges that rule created.

Clay-diorama editorial illustration of a cultivator between rows of seedlings.

What changes in this design

Without these details, a reader might think of a farm machine only as a collection of moving parts and not know that it also senses where each row section is.

This record describes a machine that senses each individual row section's location, includes pivoting bars and actuators, and has a control system that responds to the sensed locations.

That distinction helps explain the machine's focus: position information has a role alongside the pivoting bars and actuators. What the system changes in response is not stated.

The planter that stopped getting wider

In 2009 a farm equipment maker released the widest production planter ever built. The John Deere DB120 is 120 feet across, 48 rows on 30-inch spacing, and weighs more than 20 tons empty and close to 24 tons loaded with seed. It covers 70 to 80 acres an hour at about 5 miles per hour. It can't use row markers, so satellite guidance isn't optional on it.

Seventeen years later, nothing wider has replaced it. That is the fact I keep returning to. An industry that spent decades getting bigger simply stopped, and the reason isn't in the field.

Twelve feet is where the law begins

The reason is the road. Under ANSI/ASAE S279.18, equipment wider than 12 feet on a public highway picks up obligations: extra amber flashing lamps visible front and rear, yellow and red retroreflective strips kept as level as possible with no gap over 6 feet. If a towed implement hides the tractor's slow-moving-vehicle emblem or extends more than 16 feet 5 inches past the hitch point, it needs an emblem of its own.

So a 120-foot planter folds into five sections just to travel. The Deere 1775NT has a transport width of exactly 12 feet, which I don't read as a coincidence. Nearly every hinge on these machines was put there by highway law, not by agronomy.

The contest moved into the hinges

Once width was capped, the competition migrated into those folds, into how well a wing follows ground the tractor never drives over. One maker advertises 42 degrees of wing flex in a three-section front-fold frame at up to 12 mph. Deere quotes 21 degrees of up-and-down travel on the 1775NT, described as maintaining seed depth.

Which brings me to US20260223762A1, published on 6 August 2026 as Agricultural Implement and Related Method. It belongs to AGCO, filed 12 October 2023 off a November 2022 priority date, and it's still pending. The title gives away nothing. The claims are specific: a center toolbar, an intermediate member pivoted to it, a wing toolbar pivoted to that, row units carrying their own position sensors, and a control system driving both actuators from what those row units report during field work. The classification includes seed metering, so this is a planter.

The move is where the sensing lives. The others measure the frame. This one measures the seeding units and bends the frame to suit them.

An inch of depth, three days of emergence

Ohio work from 2017 to 2019, summarized by extension staff in Wisconsin, puts a number on why anyone bothers. At 1, 2 and 3 inches, shallow planting gave less uniform and more drawn-out emergence, and a plant coming up more than three days after its first neighbor lost roughly 5% of kernel weight for each day of delay. On one of the two soils, the deeper placements yielded 8 to 10% more per acre.

That's the mechanism, and it's also the tolerance. About an inch, held across sixty to a hundred and twenty feet of folding steel.

The larger dollar claims are shakier. AGCO owns a per-row downforce brand whose multi-year study reports 10.4 bushels an acre lost to light downforce, run at the company's own research farm in Illinois, one location, with hybrid and planting date varying by year. Independent on-farm trials have found smaller and more erratic responses. That brand also puts a load cell on every row unit, which is a different answer to this question from inside the same company.

Twenty-four tons on soil already failing

A 2022 PNAS paper by Keller and Or tracked combine mass from about 4,000 kg in 1958 to about 36,000 kg in 2020, and front axle wheel loads from 1,500 kg to 12,500 kg. Bigger, softer tires held surface contact stress roughly flat near 230 kPa across six decades, so the damage moved downward rather than away. Below tillage depth, moist temperate soils fail near 50 kPa. Around 20% of global cropland now carries a chronic subsoil compaction risk above one.

That's my hesitation with this filing. It adds sensors, actuators and structure to a frame that already weighs what it weighs, to protect an inch of seed depth on ground being quietly crushed underneath it.

What would have to be true

For the toolbar to be the right home for this intelligence, closing the loop there would have to hold that inch about as well as measuring every row does, for less money and less weight. AGCO reported 2025 sales of $10.08 billion, down 13.5%, with North America down 27.5%, and cut up to 6% of its salaried staff in June 2024 citing weakening demand. A cheaper way to get most of the benefit is exactly what sells into a market like that.

But it only counts as progress if the added hydraulics and steel don't drive more load into the subsoil than the recovered bushels are worth. The filing doesn't have to answer that. Someone should.

Sources

Reporting for this piece drew on the published filing and the references below.

The record, briefly. US20260223762A1, “Agricultural Implement and Related Method” The abstract describes a field implement with row-unit position sensing, pivoting toolbars, actuators, and a control system that responds to sensed positions.

More angles on this

The Leveling Bar Has a Very Firm Opinion About LevelAnother reading from the same A01B classification family, soil working in agriculture or forestry.
A Work Vehicle, Taking Its Job Quite PersonallyAnother reading from the same A01B classification family, soil working in agriculture or forestry.
CPC A01B: Soil working in agriculture or forestry; parts, details, or accessories of agricultural machines or implements, in generalThe official classification family this record was filed into, published in the USPTO Cooperative Patent Classification scheme.
CPC A01C: Planting; sowing; fertilisingThe official classification family this record was filed into, published in the USPTO Cooperative Patent Classification scheme.
An Inflatable Costume Prepares for Lift-OffAnother reading from the neighbouring A01K classification family, animal husbandry.

Read around this one:Public patent record USPTO published figure Patent issue-date index