Most Valuable Soil on Earth: 7 Soils and Land Prices

The most valuable soil on earth: the short answer

No soil has a market price of its own, so there is no single winner. The soil type with the strongest claim is the Mollisol, the dark grassland soil that covers about 7% of the world’s unglaciated land (University at Buffalo soil resource page). Its best-known home in the United States is Iowa, where average cropland was valued at US$10,700 per acre in 2026, against a national cropland average of US$6,020 (USDA NASS Land Values 2026 Summary, July 2026). Inside Iowa, the best land earns more than the worst by a wide margin. This page shows how much, which seven soils people mean when they ask this question, and how to put a price on your own field.

Written for farmers and landowners, it uses US units (acres, US dollars) with hectares where a source reports them. It is information, not valuation advice. A land appraiser or a lender will use sales near your field.

How to measure what a soil is worth

Three yardsticks are in use, and they give different answers.

• Sale price of farmland. The USDA National Agricultural Statistics Service (NASS) surveys the average value of cropland and pasture by state each year. This is the most direct price signal, but it mixes soil with location, water, crop mix and the chance of building on the land.
• Productivity. Yield per acre in a normal year, which depends on the soil’s depth, organic matter, structure and ability to hold water.
• Rarity. A soil that covers 1% of the planet is scarce, but scarce is not the same as productive.

Farmland sale prices are the only one of the three that carries a dollar sign, so most of the numbers below come from them. NASS publishes values for states and regions, not for soil orders, so the link between soil and price has to be read from comparisons inside one state, as the Iowa survey allows.

Seven soils compared by share, strength and price evidence

The list below runs from the soil with the strongest price evidence to the one with the weakest. The shares are percentages of the world’s unglaciated land. Soil scientists group soils into 12 orders in the USDA system, and six of the seven entries below are orders; terra preta is a human-made soil that sits inside them (University of Idaho, twelve soil orders).

Chart

Share of the world’s unglaciated land by soil order

Percent of unglaciated land, selected soil orders

1. Mollisols, the grassland soils

Mollisols are the soils of grassland ecosystems. They have a thick, dark, organic-rich surface layer and are rich in calcium, magnesium, sodium and potassium, which are all plant nutrients (University at Buffalo). Iowa State University describes much of Iowa as covered by deep, fertile Mollisols that formed under tallgrass prairie, among the most productive soil resources in the world (Iowa State Geospatial Laboratory for Soil Informatics).

Price evidence: Iowa cropland averaged US$10,700 per acre in 2026 (about US$26,400 per hectare), Illinois US$10,200 and Ohio US$10,100, all above the US average of US$6,020 (NASS, July 2026). The Iowa State survey of December 2025 gave a statewide farmland average of US$11,549 per acre; it uses its own method, so it does not match the NASS figure.

The Ukrainian steppe is the other famous example. A FAO country report says black soil, chernozem, makes up 60.6% of Ukraine’s arable land (FAO, Ukraine country report on plant genetic resources, with data up to 2009). Trade press tracking land deals put the March 2026 national average at 77,153 hryvnia per hectare, with the highest prices in Ivano-Frankivsk (173,500) and Kyiv (161,600) and the lowest in frontline regions such as Kherson (35,200), and says location and distance from the front line count as well as soil (AgroReview, March 2026).

2. Alfisols, the forest-and-savanna soils

Alfisols have a base saturation above 35% and a subsoil enriched with clay. They are generally fertile, with production levels similar to Mollisols, and they cover about 10% of the world’s unglaciated land, more than Mollisols (University at Buffalo). They earn a place because of their reach: a fertile soil that is more widespread than the Mollisols supports a great many farms. No official price series isolates them.

3. Andisols, the volcanic ash soils

Andisols formed in volcanic ash or other volcanic ejecta, and the name comes from the Japanese word for black soil (University of Idaho). They cover about 1% of the world’s unglaciated land, have limited distribution, accumulate organic material and are easily cultivated (University at Buffalo). They are rare and productive, but the evidence for a price premium is thin, because land prices are not published by soil order.

4. Terra preta, the Amazon’s human-made dark earth

Terra preta, Portuguese for dark earth, is fertile soil found in patches across hundreds of sites in the Amazon, in a region where the surrounding soil is often poor. A 2023 study in Science Advances, covered by ScienceAlert, compared Kuikuro villages and archaeological sites. Residential areas, ancient and modern, had significantly more organic carbon and lower acidity than the edges, and phosphorus, potassium and calcium were more than 10 times as concentrated. At the ancient Seku site the researchers estimated 4,500 tonnes of soil carbon, against 110 tonnes in the modern village’s middens. The authors conclude the soil was created on purpose, by adding waste, ash and charcoal. Terra preta covers too little land to have a market price series.

5. Vertisols, the cracking clays

Vertisols are clay-rich soils that swell when wet and shrink and crack when dry. They cover about 2% of the world’s unglaciated land, and form in warm climates on limestone, basalt or in low spots (University at Buffalo).

6. Floodplain Entisols, the river-built soils

Entisols are soils of recent origin with little horizon development. They are among the largest groups, about 16% of unglaciated land, and their quality swings widely: very productive Entisols occur on floodplains, while steep slopes and sandy areas give low productivity (University at Buffalo). Only the floodplain kind belongs on a list of valuable soils.

7. Histosols, the peat soils

Histosols are made mostly of organic material that builds up where wet ground keeps oxygen out. They cover about 1% of unglaciated land (University at Buffalo). Peat is a mined product too. USGS estimated the sales value of US marketable peat at US$11 million in 2025, from 26 producers, at an average of about US$23 per tonne at the mine (USGS Mineral Commodity Summaries 2026). Digging up peat is a different business from farming on it.

What the price data says about soil quality

The cleanest test of what soil is worth is to hold the state and the year constant and vary only the land quality. The Iowa State University Land Value Survey does that. In its December 2025 release, low-quality land averaged US$7,580 per acre, medium US$10,809 and high-quality US$14,030 (Iowa State University Land Value Survey, 9 December 2025). That puts an 85% premium on the best land over the worst, or about US$6,450 per acre (US$15,900 per hectare), inside one state.

Chart

Iowa farmland by land quality

Average value, US$ per acre, December 2025 survey

The same survey shows how much geography matters on top. The Northwest district was the highest at US$14,522 per acre and the South Central district the lowest at US$7,623. For high-quality land the gap was US$16,519 in the Northwest against US$10,677 in the South Central district. O’Brien County had the highest county value, US$16,269, and Appanoose County the lowest, US$6,679. Soil quality, rainfall history, drainage, farm size, and local demand all sit behind a county number, and the survey reports the prices, not the reasons.

The Iowa survey also warns against reading small moves as trends. Its author treats changes below 5%, up or down, as an adjustment rather than a true market shift, and the 2025 average of US$11,549 is still below the 2023 peak of US$11,835.

Cropland versus pasture: the same state, two prices

The cleanest way to see what a soil’s farming ability is worth is to compare cropland with pasture in the same state. Pasture is land that is mostly grazed, so its price does not include the crop income that tilled land can earn. In Iowa, cropland averaged US$10,700 per acre in 2026 against US$3,800 for pasture, a ratio of 2.8 to 1. Nebraska’s gap shows what water adds to a farmable soil: irrigated cropland averaged US$9,200 per acre and non-irrigated US$5,650 (NASS, July 2026).

Chart

Cropland against pasture, selected states

Average value, US$ per acre, 2026

Prices have also risen over time. The US average cropland value was US$3,350 per acre in 2012, then US$4,060 in 2020, and US$6,020 in 2026. Most of that rise happened after 2020, and the NASS series shows that values rose every year from 2021 to 2026.

Why the highest-priced cropland is not the best soil

If price per acre were a soil ranking, Rhode Island would win among the 48 contiguous states NASS covers: its cropland averaged US$34,300 per acre in 2026, followed by Massachusetts at US$26,600, Connecticut at US$23,200, California at US$18,430 and New Jersey at US$17,100 (NASS, July 2026). Those prices come from densely settled states and from California, and NASS reports the averages, not the reasons behind them. Iowa, at US$10,700, is far behind on price, and its Mollisols are the main reason people cite for what the land earns.

Chart

Average cropland value, selected states

US$ per acre, 2026; states shown are a selection

The same pattern shows up in Europe. Across 23 EU countries with 2024 data, an average hectare of arable land cost between €4,825 in Latvia and €201,263 in Malta, which Eurostat attributes to the limited supply of agricultural land and pressure from other uses. The EU average was €15,224 per hectare, which was 38 times the average annual rent of €403 per hectare of arable land (Eurostat, agricultural land prices and rents, 2024 data). The most expensive place to rent farmland or grassland in the EU in 2024 was the Netherlands, at an average of €941 per hectare per year.

So a high price tells you land is scarce or wanted, and a high price relative to rent is often read as an expectation of future gains or low interest rates. Soil quality explains only part of either.

What is the land under your feet worth? A rent-based check

Many lenders and appraisers cross-check a sale price against the rent the land could earn. Divide the yearly cash rent per acre by a rate of return, and you get an income value per acre. Eurostat’s EU average implies a rent-to-price ratio of about 2.6% (€403 on €15,224), which is the default below; US rates and rents differ by county, so enter local figures.

Soil organic matter: the part you can change

You cannot change a Mollisol into an Andisol, but you can change how much organic matter your own soil holds. A global analysis of published data on maize and wheat found that yields are on average higher where soil organic carbon is higher, but that the gain levels off at about 2% soil organic carbon. About two-thirds of the world’s cultivated maize and wheat land is below 2% (Oldfield and others, SOIL, 2019). The authors estimated that raising organic carbon to regional targets could cut global nitrogen fertilizer use by 5% to 7%, and that the yield effects are uncertain, with wide ranges (mean yield gain 10% with a standard deviation of 11 points for maize, 23% with 37 points for wheat). They say further work is needed before practical prescriptions are set.

The practical reading: if your soil is well below 2% organic carbon, adding organic matter has a better chance of paying than if it is already above. A soil test tells you where you stand. Cover crops, reduced tillage and manure are the usual tools.

▶ Why organic matter matters for soil and crops. · 7:33

What about rare earths, platinum, diamonds and fertilizer minerals?

The older version of this page listed rare earth elements, platinum group metals, diamonds and industrial minerals alongside soils. They are mined products, not soils, and their value comes from a different place: they are priced per tonne, kilogram or ounce, not per acre. The table gives USGS price estimates for 2025 so the scales can be compared. Each row is a different unit, so rows do not rank against each other.

Sources: USGS Mineral Commodity Summaries 2026 chapters on peat, phosphate rock, potash, rare earths and platinum-group metals (February 2026; 2025 figures are estimates).

Phosphate and potash are the link between mining and the field: they are the mined raw materials of fertilizer, and USGS reports that more than 95% of the phosphate rock mined in the United States was made into phosphoric acid, the feedstock for ammonium phosphate fertilizers and animal feed supplements. For how these deposits are found and tested, see our guide to bulk deposits such as phosphate and potash, and for the rarest metals and minerals, our page on the rarest mineral. A related read on fertilizer minerals is phosphate and potash for crop yield.

How satellites help you check land, soil and ground

A satellite cannot measure what your land would sell for, but it can show how a field behaves from year to year: where crops stay green in a dry spell and where they fade. That is useful before a purchase or a rent negotiation, and it complements a soil test and a county soil survey rather than replacing them. Farmonaut works with satellite imagery for both farms and mineral exploration. Landowners who suspect minerals under their ground can read about satellite-based mineral detection, request a quote through the mining query form, or reach the team through contact us. Satellite results are exploration targets that need ground checking, not a resource estimate.

▶ A short look at Farmonaut Mining Pro, which turns a licence boundary into a geological and economic picture. · 4:56

Frequently asked questions

What is the most valuable soil on earth?

No soil has its own market price, but Mollisols, the dark grassland soils that cover about 7% of unglaciated land, are the usual answer for farming. Iowa’s Mollisol-dominated cropland averaged US$10,700 per acre in 2026, 78% above the US cropland average of US$6,020 (USDA NASS, July 2026).

What is the best soil in the world for agriculture?

Deep, dark, organic-rich soils with a good structure and enough water. Mollisols are the most cited, and Alfisols are described as similarly productive. A global analysis found that crop yields rise with soil organic carbon up to about 2% (Oldfield and others, 2019). Climate and water often matter as much as the soil order.

What is the richest soil in the world?

If richest means highest in organic carbon and nutrients, terra preta is a strong candidate: Amazon dark-earth sites had phosphorus, potassium and calcium more than 10 times as concentrated as nearby soil in the 2023 Science Advances study. If it means the soil that supports the most farming, it is the Mollisols.

What is the most expensive soil?

Farmland price is not a soil ranking. The highest US state cropland value in 2026 was Rhode Island at US$34,300 per acre, among the 48 contiguous states (NASS). In the EU, arable land ranged from €4,825 per hectare in Latvia to €201,263 in Malta in 2024 (Eurostat).

What is the rarest soil?

By share of unglaciated land, Andisols and Histosols are each about 1%. Terra preta is rarer still, found in patches rather than as a mapped order. Rare does not mean most productive.

How much does a good acre of cropland cost in Iowa?

In the Iowa State survey of December 2025, high-quality land averaged US$14,030 per acre, medium US$10,809 and low US$7,580. County averages ran from US$6,679 in Appanoose County to US$16,269 in O’Brien County. Your price depends on the field’s rating, its location and the market.

How can I tell what soil I have?

Look up your field in the USDA Web Soil Survey, then confirm with a lab soil test. The survey names the soil series and its properties; the test measures organic matter, pH and nutrients.

Does more organic matter always mean higher yields?

No. The 2019 global analysis found the yield gain levels off at about 2% soil organic carbon, and the effect varies by crop, climate and farming system. The authors call for local trials before setting prescriptions.

Are rare earths or diamonds a kind of soil?

No. They are minerals mined from rock and priced by weight. USGS puts neodymium-praseodymium oxide at about US$69 per kilogram and platinum at about US$1,200 per troy ounce in 2025 (estimates). They are valuable for industry, not because they grow crops.

Can satellites show how good my soil is?

Not directly. Satellite imagery shows how vegetation responds across a season, which hints at differences in soil and water within a field. A soil test and a soil survey give the actual measurements.