In October 1972, on a farm called Rhenânia near Rolândia in northern Paraná, a German-born Brazilian farmer named Herbert Bartz did something his neighbors thought was insane. He drilled 200 hectares of soybeans straight into unploughed ground.
He had spent the previous year traveling: to Germany, to England, and finally to Christian County, Kentucky, where an American farmer named Harry Young Jr. had been experimenting with “no-tillage” for a decade. Bartz brought home an Allis-Chalmers planter, watched a frost destroy his wheat crop, and went into debt to try the new system anyway. His neighbors said he had lost his mind. The Federal Police, suspicious of soybeans grown without ploughing, briefly seized his first harvest.
Fifty-some years later, Brazil cultivates somewhere north of 41 million hectares under what the country now calls Sistema Plantio Direto: direct planting. Argentina runs more than 90 percent of its grain land the same way. Western Australia has flipped almost entirely. Kazakhstan, which had effectively zero hectares under no-till in 2000, now has more than two million.
Globally, what Bartz quietly pioneered (together with a handful of researchers in Kentucky, Paraguay, the UK and Brazil’s own Iapar institute) has scaled to more than 200 million hectares. That’s roughly 15 percent of the world’s cropland, a footprint larger than any clean-tech sector you can name on a stock exchange.
And it scaled almost entirely because it made farmers more money.
This is the story most climate coverage misses.
What “conservation agriculture” actually is
The Food and Agriculture Organization defines conservation agriculture (CA) by three interlocking principles, all of which have to be present for the system to work as designed.
The first is minimum mechanical soil disturbance: no-till or zero-till seeding, where crops are drilled directly into residue with as little disruption as possible. The second is permanent soil cover, achieved through retained crop residue, mulch, or cover crops grown between cash crops. The third is crop diversification: meaningful rotations, often including legumes, rather than back-to-back monocultures.
You’ll hear the practice called different things depending on where you are. In Brazil it’s plantio direto. In Argentina, siembra directa. In English-language farming press, “no-till,” “zero-till,” “direct seeding” and “conservation tillage” all show up, sometimes interchangeably and sometimes not. The distinctions matter: “no-till” alone (without cover and rotation) captures only a fraction of what the full system delivers, a point Brazilian researchers have been making since the late 1970s.
That’s the technical bilingualism. The plain-English version: stop turning the soil over, keep it covered, and don’t grow the same thing on it twice in a row.
The scale story
The expansion has been quietly relentless. According to global surveys led by Amir Kassam, Theodor Friedrich and Rolf Derpsch (the work most analysts cite), CA grew from roughly 106 million hectares in 2008/09 to about 180 million in 2015/16, then to 205 million hectares across 102 countries by 2018/19. That last figure represented about 14.7 percent of the world’s cropland. CIMMYT researchers writing in 2024 put the current figure at around 250 million hectares, growing by roughly 10 million hectares per year.
About half that area sits in the Global South and half in the Global North. The leadership board is unusual: South America runs the largest national programs, Australia and Canada are top-five adopters, and Kazakhstan has become a quietly important wheat-belt success. The United States is in the mix but is not the runaway leader most American readers assume.
The ground-truth caveat: not every reported hectare is true conservation agriculture. Many “no-till” hectares lack the cover and rotation pieces, and partial adoption captures only part of the climate and soil benefit. For retailers and brands trying to source against soil-health claims, this gap between technique and full system is where due diligence matters most.
Brazil: where the system was conceptually built
Bartz’s 1972 planting was the spark. The infrastructure came later. From an initial 200 hectares in 1972, plantio direto reached roughly 200 farms across Paraná by the 1975/76 season. Two more pioneers, Franke Dijkstra and Manoel Henrique Pereira (“Nonô”), adopted the practice in 1976 and, in 1979, founded the Clube da Minhoca (Earthworm Club) in Ponta Grossa to spread it farmer-to-farmer. Other “Friends of the Land” clubs followed.
Brazil’s Iapar (now IDR-Paraná) and EMBRAPA gave the system its scientific spine, formalizing the three-principle framework and coining the integrated term Sistema Plantio Direto by 1976. The 1990s brought mechanization and modern herbicides, and the practice exploded across the Cerrado, transforming a region once considered marginal into one of the world’s most productive grain belts. Brazil’s 2017 agricultural census put more than 33 million hectares under the system; recent estimates exceed 41 million: about 62 percent of the country’s grain area.
Bartz himself died in January 2021, aged 83. His coined motto, recorded in his biography:
Nature does not accept bribes. — Herbert Bartz
Argentina: a farmer association that ran ahead of the state
In the same era that Brazilian growers were experimenting in Paraná, Argentine technicians at INTA Marcos Juárez were running their own no-till trials. The first national meeting on the practice was held in Córdoba in 1977. In 1989, a small group of producers founded Asociación Argentina de Productores en Siembra Directa (AAPRESID) to scale what was still a fringe technique.
AAPRESID is the cleanest example anywhere of a farmer-led conservation movement that outpaced its government. Through the 1990s, with no-till seeders becoming widely available and herbicide-tolerant soybeans entering the market, the technique went from marginal to dominant. Today it covers more than 90 percent of Argentina’s grain land (by some AAPRESID estimates, around 95 percent on soybean), making Argentina the world’s most fully no-till country.
That number comes with an honest asterisk. Much of Argentina’s adoption is no-till applied as an isolated technique, without the rotation and cover components that make CA a true system. Herbicide-resistant weeds are now widespread, and a 2023 AAPRESID survey found that 16 percent of its own member farmers had returned to some tillage to control resistant weeds: a sobering data point for anyone who assumed the system was permanently locked in.
For sourcing teams, this is the actionable nuance: a claim that a grain came from “no-till Argentina” may technically be true while still falling short of full conservation-agriculture standards.
Australia: dust-bowl drylands rebuilt
Australian no-till has a different origin story. Garry Hine, a Western Australian farmer, sprayed paraquat instead of ploughing in 1963, initially to control annual ryegrass, not to save soil. By the late 1970s, much of WA’s wheatbelt was effectively unfarmable: sandy soils exhausted, wind erosion devastating yields, profitability gone.
The turnaround came through a farmer association. The Western Australian No-Tillage Farmers Association (WANTFA) was founded in 1992 on the ethic of “grower helping grower.” Adoption rates moved fast. According to Australia’s Grains Research and Development Corporation, national no-till adoption rose from roughly 5 percent in the early 1980s to about 80 percent today, with Western Australian rates above 90 percent. WANTFA’s own materials cite more than 95 percent adoption of no-till seeding systems in WA.
The Australian story is also a climate-adaptation story. In a country where rainfall is both limited and erratic, retained stubble and undisturbed soil dramatically increase the share of rainfall that ends up available to the crop. WANTFA’s long-term research project with CSIRO, GRDC and DPIRD has spent more than fifteen years figuring out how to maintain those gains as herbicide-resistant weeds, soil compaction and management plateaus complicate the picture.
Kazakhstan: drought resilience as the killer feature
The most striking national case is post-Soviet. Kazakhstan’s wheat belt (northern, semi-arid, with roughly 250 to 350 millimeters of annual precipitation, much of it as snow that blows off bare soil) was a textbook candidate for conservation agriculture. With support from FAO, ICARDA, CIMMYT, the World Bank and the Kazakh Ministry of Agriculture, conservation tillage went from essentially zero in 2000 to about 1.4 million hectares by 2008 and roughly 2 million hectares of full zero-till by 2012. The same year’s Ministry of Agriculture data showed conservation tillage practices on 11.7 million hectares: about 70 percent of the country’s wheat area, although true full-CA hectares are a smaller subset.
The validation arrived in the drought of 2012, when Kazakhstan’s wheat harvest fell by more than half. Wheat under zero-till delivered up to three times the grain of conventionally tilled wheat in the same conditions. Valentin Dvurechenskii, then director of the Kostanay Agricultural Research Institute, told CIMMYT bluntly that without no-till, the year would have been an “absolute catastrophe.” That’s the kind of lived evidence that converts ministries, and it has.
Zambia and the smallholder frontier
Africa is where the next chapter is being written, and where the easy story breaks down. CIMMYT, FAO, IITA and national partners have spent more than two decades promoting CA across southern Africa. The agronomic results, where farmers commit to the full package, are striking: maize yields under conventional Zambian smallholder management run around 1.9 tonnes per hectare, while CA fields have hit 4.7 tonnes; in Malawi, CA combined with nitrogen-fixing trees has produced yield gains of up to 400 percent.
Yet adoption among smallholders remains low. CIMMYT and partners report more than 50,000 farmers in Zambia and 65,000 in Malawi practicing CA: meaningful, but a fraction of either country’s farming population. Recent research from the Sustainable Intensification of Smallholder Farming Systems in Zambia (SIFAZ) project, which has reached 54,000 farmers across 27 districts and put more than 18,000 hectares under sustainable intensification practices, points to a familiar set of barriers: short-term yield uncertainty, labor demands of hand-dug planting basins, competition with livestock for crop residue, limited access to appropriate seeders, and risk aversion in households living close to the food-security line.
The lesson here is one industry buyers should internalize before designing soil-health sourcing programs in Africa: CA is knowledge-intensive, slow to pay back, and almost always needs mechanization, finance and extension to stick at smallholder scale.
The climate science (and the asterisks)
This is where careful framing matters most.
Project Drawdown’s most recent modeling estimates that conservation agriculture can reduce 8 to 13 gigatons of CO₂-equivalent by 2050, with average soil-carbon sequestration rates of 0.25 to 0.78 tonnes of carbon per hectare per year depending on climate zone, plus an emissions-reduction credit of about 0.23 tonnes CO₂-e per hectare per year from skipped tillage passes, lower fuel use and reduced fertilizer manufacture. The most recent IPCC AR6 cropland-management benchmark sits in roughly the same range. Drawdown projects the global CA footprint could grow to 327–400 million hectares by 2035.
The honest caveat is that the soil-carbon piece of that math has been the subject of a sustained scientific argument since at least 2014, when David Powlson and colleagues published “Limited potential of no-till agriculture for climate change mitigation” in Nature Climate Change. Their finding, reinforced by subsequent meta-analyses (VandenBygaart 2016; Ogle et al. 2019; Moinet et al. 2023): much of what looked like new soil carbon under no-till was in fact a redistribution of existing carbon toward the soil surface, not a net atmospheric drawdown. Soil-carbon gains saturate after one to a few decades, and any storage is reversible the moment a field is ploughed again.
The emissions-reduction case (fewer tractor passes, less diesel burned, less compaction, less erosion) has held up well. The soil-carbon case has been refined downward but is still real, particularly in warmer, wetter climates and in soils with substantial unfilled carbon-storage capacity.
For retailers underwriting soil-health claims and for brands designing carbon-insetting programs in their grain supply chains, this is the bottom line: conservation agriculture is one of the most defensible adaptation and emissions-reduction stories in food and ag. It is a more uncertain removals story. Treat sequestration claims with appropriate humility, and don’t let permanence and additionality questions get hand-waved.
Five things that cut against the usual climate-tech narrative
It began as an erosion fix, not a climate solution. Bartz, Hine and the Argentine pioneers all set out to keep their topsoil from washing or blowing away: the climate co-benefit came along for the ride.
Farmer associations did the heavy lifting. The Earthworm Club, AAPRESID, WANTFA and FEBRAPDP scaled CA before national governments seriously engaged. Top-down policy followed grass-roots adoption, not the other way around.
It scaled because it cut costs. Fewer tractor passes, less diesel, less labor at land-prep stage. The economics worked first; the soil and climate stories worked second.
The soil-carbon claims have been refined downward. Early Rattan Lal–era enthusiasm has been tempered by Powlson and others. The case for CA now rests at least as much on emissions reduction and resilience as on net carbon storage.
It is reversible, and is being reversed, in places. Argentina’s herbicide-resistance struggles and AAPRESID’s own 16 percent return-to-tillage figure are warnings. Glyphosate-resistant weeds, soil compaction and lazy rotations can erode the gains farmers fought to build.
What you can actually do
For consumers, the highest-leverage moves are to favor brands that publicly source from conservation-agriculture supply chains: pasta and bread brands sourcing from no-till Argentine, Australian or Brazilian grain <!-- AFFILIATE: pasta/bread brands -->; oat brands working with cover-cropped Northern Plains farms <!-- AFFILIATE: oat brands -->; cooperatives that audit soil practices upstream <!-- AFFILIATE: cooperative grain/coffee/tea -->; and to read claims skeptically. “No-till” alone is not the same as full conservation agriculture, and “regenerative” is a stricter conversation we cover separately.
For industry readers (sourcing leads, sustainability directors, foodservice procurement, packaging clients with grain-heavy supply chains) there are a few priorities. Push suppliers to verify all three CA principles, not just no-till. Support farmer-led extension organizations directly: AAPRESID, FEBRAPDP, WANTFA, the Africa Conservation Tillage Network (ACT), the Rwanda Institute for Conservation Agriculture (RICA). Advocate for crop-insurance and risk-sharing reforms that reward cover cropping and rotation diversity: an area where U.S. and EU policy is meaningfully behind the agronomy. And design soil-health sourcing standards that explicitly distinguish adaptation and emissions reductions (defensible) from carbon-removal claims (require more rigor).
The next frontier
The CA story so far has been written by mid-to-large mechanized farms in temperate and subtropical zones with reliable herbicide access and a strong farmer-association ecosystem. The next frontier is harder: smallholder systems in sub-Saharan Africa and South Asia, where labor economics, livestock-residue competition, mechanization gaps and risk profiles all make the transition steeper. The agronomic case is solid; the implementation case is still being figured out, country by country, year by year.
Half a century after Bartz drilled 200 hectares of soy into unploughed Paraná soil, the most consequential climate practice on cropland is still being scaled, quietly, farmer to farmer, mostly outside the global media frame. The retail supply chain runs through it. The next decade will determine whether the story reaches the people who depend on those soils most.
P.S. If you’ve come across a quietly working climate practice in your part of the world that hasn’t broken into the mainstream news cycle yet, I’d love to hear about it. The Earthworm Club started with three farmers in Ponta Grossa.