Field Notes

The Seedling Plan Has a Quiet Opening Act

Seventy-five years after Schindler patented seed tape, a Dutch carriage fixes how it gets buried; the harder question is what the tape is made of.

Clay-diorama editorial illustration of a mechanical planter placing seeds in soil.

What changes in this design

A reader might picture planting as putting seeds directly into a hole or furrow in the ground. That is the simple mental model this record helps refine.

Instead of focusing on loose seeds, the record follows seed tape: a carriage feeds it, then a pressing disc folds it into a narrow soil slit and presses it down.

Knowing that distinction makes the illustration easier to read. The central subject is not just seeds meeting soil, but the handling and pressing of seed tape.

Fifty percent, at Serooskerke

In March 2026 a chicory crop went into the ground at Serooskerke about a month early. Sowing on the 19th and 20th, instead of the usual 20 to 22 April, bought roughly thirty extra growing days. The seed arrived pre-spaced on a tape. When the counts came in, emergence averaged about 50 percent, near 100,000 plants a hectare, at an indicative five cents per metre of tape and planting, which works out around 1,000 euro a hectare at 50-centimetre rows, before seed.

Across five trial variants the tape did not consistently beat conventional treatment, a result I can't call a clear win. Peter van den Bosch of Sensus, the company that ran the trials with the tape's maker and a local grower, put it plainly: 'Lintzaai gaat dat niet oplossen. Echt makkelijk wordt het nooit.' Tape sowing isn't going to solve it. It's never going to be easy.

A 1948 idea, folded the other way

Seed tape is not new, and the version being improved on here is very specific, a distinction I think matters.

George Anthony Schindler filed in December 1948 and was granted in October 1951: seeds glued at fixed spacing between two strips of porous, non-absorbing paper, sixteen-pound sulphite, he specified, with the ribbon "projected edgewise into the slit or furrow, and the soil pressed against its opposite sides." Vertical slit. Edge down. Seventy-five years ago.

The pressing disc and what it fixes

The filing I've been reading published this August and is still pending. It comes from a Dutch company in Nederweert, S&dB, with Gerard Otten and Marco Rijstenbil named on the European original from January 2023. It's a carriage. A cutting disc opens a slit, a feeder pays out tape, and a pressing disc folds the tape downward into the slit and pushes it below the surface, leaving a gap above it. The European text names Schindler's patent and says what goes wrong with it. Tape left protruding catches the wind and gets pulled out. The exposed edge wicks moisture away from the seed. Residue on the surface contaminates the crop and fouls mechanical weeding.

So the novelty is the direction of the fold and keeping every edge under grade. The US claim adds the material: a polymer film with seeds embedded, plus a porous reinforcing layer, folded so the reinforcement ends up on the inside. A second claim adds an adjustable force that sets how deep the pressing disc goes. I think that's careful work. It's also a small thing.

One centimetre of moist soil

Chicory can't be sown deeper than about a centimetre. Whether the seedlings come up depends on whether there's moisture at that centimetre, not on how evenly the seeds are spaced. The competing approach doesn't use tape at all: an ultra-precision seeder carrying soil-moisture sensors on its seeding elements, varying sowing depth in real time, trialled in 2025 on maize and sugar beet with parallel chicory work. Same problem, opposite end of it.

And the tape was patented before the machine was. The same company's 2019 application defines it: a biodegradable film of polyvinyl alcohol, starch, polyvinyl acetate or mixtures, 20 to 175 micrometres thick, optionally reinforced with a nonwoven of cellulose, hemp, jute or polylactic acid. The 2023 filing is the applicator for a material claimed four years earlier. That ordering, I think, tells you where the value is thought to be.

Where the risk actually sits

The EU's microplastics restriction has applied since October 2023. It bars synthetic polymer microparticles at or above 0.01 percent by mass, and it exempts materials that are natural, inorganic, water-soluble or biodegradable. Seed coatings are a small slice of the problem, about 0.22 percent of microplastic releases, roughly 500 tonnes a year across Europe, but the exemption is doing the work here. The film's patent leads with the word biodegradable.

PVA is the part I'd watch. A mass-balance study of US wastewater treatment found only about 23 percent of it degrades, leaving roughly 77 percent intact and an estimated 8,100 tonnes a year reaching the environment, most of it spread on land in biosolids. Soil isn't a treatment plant, and that study isn't about fields. But it's the same polymer, and biodegradable is a claim about conditions, not a property.

So the placement is solved, and solved neatly, while the company's own public claims for the product carry no numbers at all. Its partner in the field measured half a stand and said the tape won't fix what's broken. Seventy-five years of engineering has gone into the applicator. The open question is the ribbon.

Sources

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

The record, briefly. US20260223764A1, “A Method and Apparatus for Planting Seeds” The abstract describes a carriage that feeds seed tape and uses a pressing disc to fold and press the tape into a soil slit.

More angles on this

The Seed Method's Extremely Serious Fresh StartAnother reading from the same A01C classification family, planting; sowing; fertilising.
Seeds Are Being Asked to Land With IntentionAnother reading from the same A01C classification family, planting; sowing; fertilising.
CPC A01C: Planting; sowing; fertilisingThe official classification family this record was filed into, published in the USPTO Cooperative Patent Classification scheme.
The Leveling Bar Has a Very Firm Opinion About LevelAnother reading from the neighbouring A01B classification family, soil working in agriculture or forestry.
Confectionery, Seen Through the Eyes of a Tiny MuseumAnother reading from the wider A23G classification family, cocoa.

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