Organic vs. Conventional Yields: What Meta-Analyses and Trials Show

Ask ten people whether organic farming yields less and you will hear everything from "organic can't feed anyone" to "organic matches conventional once the soil comes back." Both camps usually point to real studies. They just read the headline number and skip the part where the authors explain what that number applies to.

This post walks through the four pieces of evidence that come up most often: two large meta-analyses (Seufert and colleagues in 2012, Ponisio and colleagues in 2015) and two long-running side-by-side trials (Rodale Institute's Farming Systems Trial in Pennsylvania and FiBL's DOK trial in Switzerland). For each, we cover what it found, how it was designed, and what it cannot tell you.

The short version: a yield gap is real on average, its size depends heavily on crop and management, and none of these studies can predict what will happen on your particular farm.

Key takeaways

• Across the big meta-analyses, organic yields average roughly 19–25% lower than conventional, but the gap ranges from about 5% to 34% depending on crop, soil and how the comparison was set up.
• Diversification matters. Ponisio et al. (2015) found the gap shrank to about 8–9% when organic systems used crop rotations or multi-cropping.
• Nitrogen-hungry crops such as cereals and many vegetables tend to show bigger gaps. Potatoes in the Swiss DOK trial yielded 35–42% less under organic management.
• Rodale reports that its organic corn and soybeans match conventional after transition and out-yield it in drought years, but these are the institute's own findings, and its trial is one site.
• Yield is not profit. A separate meta-analysis (Crowder & Reganold, 2015) found organic price premiums of 29–32% more than offset the yield gap on average.
• Treat every figure as a starting point for your own crop budget, not a forecast.

The two meta-analyses everyone cites

A meta-analysis pools results from many individual studies. That makes it good at spotting average patterns and bad at describing any single farm.

Seufert, Ramankutty & Foley (2012), Nature

This is the most-cited yield comparison. The paper puts the overall gap at about 25% lower for organic, a figure widely repeated from the body of the paper. The more useful findings are the sub-groups reported in the abstract:

• about 5% lower for rain-fed legumes and perennials on weakly acidic to weakly alkaline soils
• about 13% lower when best organic management practices were used
• about 34% lower when the conventional and organic systems were most comparable

Cereals and vegetables showed larger gaps, and the authors identified nitrogen limitation as a key explanation. That last point matters for anyone managing fertility. The compost, manure and cover crops that organic systems rely on release nitrogen more slowly and less predictably than synthetic sources.

Limits: the 34% figure for the "most comparable" systems is a reminder that some of the smaller gaps may partly reflect differences in how studies were set up. Averages across dozens of crops and countries also hide huge variation.

Ponisio et al. (2015), Proceedings of the Royal Society B

Ponisio's team used a larger dataset, 115 studies with over 1,000 observations, and estimated organic yields at 19.2% (±3.7%) lower. The authors argued that earlier meta-analyses had biased study selection.

The headline for practical farmers is diversification. When crop rotations or multi-cropping were used only in the organic systems, the gap fell to about 8% (±5%) for rotations and 9% (±4%) for multi-cropping.

Ponisio's abstract also reported no significant difference in the gap between legumes and non-legumes, perennials and annuals, or developed and developing countries. That does not line up neatly with Seufert's legume and perennial finding, and it is a fair illustration of how dataset choices change conclusions.

Limits: a published comment (2016) argued that per-crop yield comparisons like this miss land-use efficiency at large scale. For example, a rotation with a fertility-building year may yield well per crop but produce less food per acre per year across the whole rotation.

Other meta-analytic findings worth knowing

• Stability: a 2018 Nature Communications meta-analysis (Knapp & van der Heijden) found organic systems had lower absolute yield stability than conventional, while variability relative to yield was broadly similar.
• Pollinators: a 2026 Proceedings B paper reports that the gap narrows as a crop's dependence on pollinators increases. We have not confirmed its specific numbers, so treat it as a direction rather than a figure.

Long-term trials: what they add and where they stop

Meta-analyses mix short and long studies. Side-by-side trials running for decades show how systems change as soils adjust. Their weakness is the opposite one: each is a single location with its own soil, climate and management choices.

Rodale Institute Farming Systems Trial (Kutztown, Pennsylvania, since 1981)

This is the longest-running U.S. side-by-side comparison of organic and conventional grain systems. Rodale's trial page and 40-year report state that:

• organic corn and soybean yields match conventional after the transition period
• organic corn yields were 31% higher in drought years (the report cites the 2016 drought)
• 15–20% more water percolates through organic soils
• nitrates below the rooting zone were six times higher in conventional plots
• organic systems out-earned conventional over 2008–2020, and the manure-based organic system was the most profitable even without organic premiums

Limits to state plainly:

1. Rodale is an organic research and advocacy organization, and much of this is published by Rodale itself rather than only in peer-reviewed journals. A peer-reviewed perspective paper (Moyer, 2013, Crop Management) discusses the trial's design and interpretation.
2. The claim of higher profit without premiums runs against the meta-analytic evidence below, so attribute it to Rodale rather than treating it as settled.
3. Some figures that circulate online, such as large energy, emissions and multiple-times-profit claims, were not found in the 40-year report. Don't repeat them unless you can trace them to a specific Rodale document.

FiBL DOK Trial (Therwil, Switzerland, since 1978)

DOK compares biodynamic, bio-organic and conventional systems. Unlike many comparisons, the conventional treatment includes a manure-based system (called CONFYM), so it is not simply "organic vs. synthetic only." FiBL's DOK dossier reports:

On soils, FiBL reports that soil organic carbon rose 12% over 42 years in the biodynamic system, stayed constant in the bio-organic and conventional manure systems, and fell 22% in unfertilized plots. FiBL's news summary puts organic yields at about 85% of conventional, humus 16% higher, and soil-organism activity up to 83% higher.

Limits: one site, one climate and a specific set of crops. The trial shows organic trading some yield for large cuts in inputs. Whether that trade pays depends on prices and costs that the trial does not set for you.

Reading the evidence side by side

A few patterns hold across all four. The gap is smallest where fertility is less limiting (legumes, diversified rotations) and largest for demanding crops like potatoes and many cereals. Management matters as much as the label. And weather years matter: Rodale's drought-year result and the stability meta-analysis point in different directions on risk, which is a good reason not to lean on any single study.

Yield is only half the ledger

Yield per acre does not pay the bills by itself. Crowder and Reganold's 2015 PNAS meta-analysis (44 studies, 55 crops, five continents) found organic yields up to 18% lower, but organic price premiums of 29–32%. Organic was significantly more profitable on average, and the break-even premium was only 5–7%. That means organic can still pay if premiums shrink a lot, but not if they disappear. Premiums are market-dependent, so check current prices for your crop rather than assuming a historic average.

What to do next

Use the research to ask better questions about your own operation:

• Identify your crops' likely gap. Legumes, perennials and grass-clover sit at the smaller end in these studies; potatoes, cereals and many vegetables at the larger end.
• Plan the rotation, not just the crop. Ponisio's rotation result is the strongest practical lever in this evidence, but cost out the fertility-building years too.
• Map your nitrogen supply. Nitrogen limitation was a key driver of the gap. Ask your extension office for organic fertilizer and cover crop nitrogen estimates for your soils.
• Build a crop budget with a yield discount and a premium range. Use a state extension organic enterprise budget where one exists, and run a scenario with a smaller premium.
• Watch sources. When you see a single yield number, check whether it is a meta-analysis average, a sub-group, or one trial's institution-published result.

For more on the money side, see our companion posts on surviving the organic transition and on realistic market-garden income. Before making changes, talk with your certifier, extension office or a farm business advisor.

Sources

• Comparing the yields of organic and conventional agriculture — Nature (April 25, 2012)
• Can organic food feed the world? — ScienceDaily (April 2012)
• Diversification practices reduce organic to conventional yield gap — Proceedings of the Royal Society B (January 2015)
• Diversification practices reduce organic to conventional yield gap (open copy) — eScholarship, UC Berkeley (2015)
• Current approaches neglect possible agricultural cutback under large-scale organic farming (comment) — Proceedings of the Royal Society B (2016)
• A global meta-analysis of yield stability in organic and conservation agriculture — Nature Communications (2018)
• The conventional-to-organic yield gap diminishes with increasing crop pollinator dependence — Proceedings of the Royal Society B (2026)
• Farming Systems Trial 40-Year Report (PDF) — Rodale Institute (2020)
• Farming Systems Trial overview — Rodale Institute (accessed September 2026)
• Perspective on Rodale Institute's Farming Systems Trial — Crop Management, Wiley (2013)
• The DOK Trial: a 45-year comparative study (dossier PDF) — FiBL (2025)
• 40 years of organic farming: strong for soils and efficient — FiBL (updated February 6, 2025)
• Organic agriculture more profitable to farmers — WSU Insider (June 1, 2015)
• Financial competitiveness of organic agriculture on a global scale — PNAS (June 2015)