How Soil Documentation Can Increase the Sale Price of Farmland | Especially for Farms with Low and Moderate Soil Quality

When the time comes to sell farmland, most sellers assume the outcome is driven mostly by soil quality scores including CSR2, NCCPI, or PI. While soil maps and soil ratings do play a major role, they often tell only part of the story. High-quality farms tend to “sell themselves” because buyers are already confident in their long-term yield potential.

But what about farms with low and moderate soil quality, those 50–75 CSR2 farms, the mixed treats of Clarion-Nicollet-Webster blends with some variability, or rolling fields with more marginal slopes and soil types? These are often thought not to command the premium they deserve unless the seller has the data to prove performance.

In a competitive or soft land market, the sellers who can **document fertility, yields, and soil improvement over time** can differentiate themselves in a way that soil maps alone never will. And in strong markets, added transparency can push values to the top of the range—sometimes tens or even hundreds of thousands of dollars more.

In this blog, I discuss:

Why traditional soil maps cannot tell the full story

The value of tracking soil fertility and yield over time

What documentation buyers actually trust

How to build a land data “portfolio” that boosts sale value

Why this matters most for low and moderate-quality farms

How to protect the value of the highest quality farms

Soil Maps Are Helpful But They Are Not the Whole Truth

Your soil map is a lie.  There I said it.  I don’t think its some conspiracy.  In fact, I bet most just look at a soil map even in my industry and accept it as fact without putting much through into it.  Its sort of like believing in Santa Clause, you never questioned it when you did believe, but after you learned the truth you realized the impossibility of Santa Clause.  The same impossibility exists with the soil mapping our industry has relied on for many years.  That said, its also the best we have right now but it is already know that despite the fact they are always presented from data sources and the courthouse and many government agencies or universities with no disclaimer at all, it is known they are not accurate.

“Soil Property and Class Maps of the Conterminous U.S. at 100 m Spatial Resolution…” (Ramcharan et al., 2018) found classification accuracies of about 60% for “great groups” and ~66% for “modified particle size classes.”

“Accuracy of regional-to-global soil maps for on-farm scale” by Maynard et al. (2023) found publicly-available soil maps in Ghana “lack the needed accuracy … at the 1–2 ha scale common to smallholders” and found error rates such that soil texture class predictions were wrong 6–9 times out of 10 in some cases.

“Map units were designed to meet specific user needs” and that “One should not assume that the soil survey data and maps completed many years ago … meet the standards and expectations of users today.”

“These static maps … serve as a strong baseline and starting point that accurately reflect spatial patterns across the field,” but the article also emphasizes that to optimize for management, further sampling is required.

Soil maps can only give a broad, generalized look at soil type. They are very good for comparing farms, estimating productivity, and understanding soil potential, but they have limitations: They are in any estimation only 70–85% accurate on average, lower at times, higher at times and often based on decades old data. They cannot reflect management, erosion, or fertility improvements.  They do not account for tile drainage, cover crops, manure history, or conservation.

Soil map units generally do identify dominant soil types or landscape units, especially at broader scales fairly well. However, the exact boundaries, proportions of component soils within a unit, or field-level variability are much less reliable. The accuracy declines as the scale becomes finer (field-level, small parcels) or as terrain/soil‐complexity increases.

Soil maps give us a useful baseline, but they do not guarantee exact field‐by‐field soil types, boundaries, or conditions. Because of natural variability and changes over time (erosion, management, drainage, etc), you’ll want to supplement baseline maps with actual soil tests, yield records, and field evidence. Especially for low and moderate‐quality farms, the uncertainty in mapping and therefore risk to a buyer is precisely what your documentation strategy addresses.

Soil maps are the best we have available to us today.  They do simplify the fields into mapping units that can contain multiple soils types. A soil map might inform you what the land should be capable of, but serious farmland buyers want to know: “How has this farm actually performed”? A low and moderate-soil farm with strong yield history often will sell better than a high-soil farm that has mediocre results, poor pH or exhausted fertility.

Why tracking soil fertility matters when selling a low and moderate-quality farm

High-CSR2 land has proven potential. Investors and aggressive operators will bid for it based on soil maps alone.

Low and moderate land requires proof of performance to earn top dollar.

Suppose there were two farms both having a CSR2 of 68:

Which one sells for more? Without question, Farm B. In a tight market, Farm B may sell for 10–20% more simply because buyers see less risk and more upside.

Most Valuable Data to Collect, Ranked by Buyer Impact

If a seller wants to build a data-driven land value “portfolio,” here is what has the greatest influence on bidding:

1. Long-Term Yield History

• 5–10 years of yields, better yet with precision yield maps, will beat CSR2 alone.
• Add weather context such as rainfall and drought stress, delays in planting, and buyers will assign more credibility.

2. Soil Fertility Tests

• Annual or bi-annual grid or zone soil tests showing:
• pH levels
• N-P-K
• Organic matter
• CEC
• Micronutrients

People pay more because they don’t have to fix depleted soils in the first 3 years of ownership.

3. Conservation & Soil Health Practices

• Documented actions that preserve or improve soil include:
• Cover crops
• Minimum or no-till adoption
• Contour farming
• Filter strips, terraces, waterways
• Various terms are used to refer to these programs, including: CRP or conservation contracts
• Manure program details
• Erosion control measures

These factors not only retain topsoil, they signal responsible stewardship, which farmland investors value.

4. Tiling & Drainage Records

• Maps, invoices, dates, contractors, and tile sizes.
• Good drainage can dramatically exceed CSR2 expectations.

5. Fertility & Input Records

Showing applications of fertilizer, lime and nutrients supported with soil tests is a story of active soil management, not mining.

Farmland Performance Portfolio to Build Confidence in Buyers

A soil map is one page. Its old data from a computer.  The Farmland Performance Portfolio is a powerful package that can include:

• Soil maps + explanation of limitations
• 5–10 years yield history + APH crop insurance documentation
• Soil test results over time
• Tile maps and drainage records
• Summary: Fertility and conservation investing
• Photos and drone imagery
• Narrative story about the farm’s care and improvements

This turns a farm from a commodity into a proven income-producing asset and most sellers don’t protect the value of the farm and do this. Those who do gain price appreciation at levels different than other farms.

Why Documentation Helps You in a Down Market and Supercharges You in an Up Market

Down Market

Purchasers are becoming risk-averse. They avoid land needing immediate investment in fertility, tile, or liming.

Documented performance reduces risk—and reduced risk means sellers keep more value.

In a Strong Market

Documentation moves a property from “just another farm for sale” into the elite group of easy-underwriting, proven-performance assets.

Investors appreciate predictable returns and will often bid above local comps for documented farms.

The Psychology Behind Why Buyers Pay More for Proven Performance

Most farmland buyers, whether they are farmers or investors, are naturally conservative.

They ask themselves three questions:

1. What can I create here?

2. How soon will I need to invest money into the soil?

3. What’s the long-term earning potential?*

A confident seller who is able to hand over documentation answers all three with confidence. That confidence often converts into stronger interest and stronger participation or bids.

Keys for Farmland Sellers: Start Documenting Early

If you plan on selling farmland in the next 2–10 years, start developing your portfolio now. It doesn’t have to be complicated. One binder or digital folder per year works.

Even 3 years of organized data is better than none.

If you have a tenant, require in the next lease:  Annual soil testing, Yield reporting, Documentation of all tile and drainage work preformed on the soil, Nutritional plan, Completion of conservation work. These expectations build value as you own the farm and maximize your eventual sale price.

My Final Thoughts Low and Moderate Soil Farms Have Untapped Value

High-quality soil land sells at the top of the market almost effortlessly. In down markets you need insurance and documentation protects its value.  Low and moderate land sellers, however, have a unique opportunity: You can beat the soil map by proving performance to better compete in value with higher soil quality farms. By documenting fertility, yield, and stewardship, you turn a “low and moderate” farm into an exceptional opportunity with a track record and serious buyers will compete for that.

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