Daily News Briefing

Harry Stedman
Tuesday 20 Jan 2026

Wheat–bean intercropping shows potential to lift milling protein with lower nitrogen — but results vary by season

New UK trial findings suggest that intercropping winter wheat with a nitrogen-fixing pulse can support grain protein levels in low nitrogen systems — but performance is strongly influenced by seasonal conditions, particularly moisture and pulse crop health.

For milling wheat growers, grain quality is as commercially significant as yield. Achieving breadmaking specifications of around 13% proteinhas become more difficult as fertiliser strategies tighten under a combination of cost pressures and environmental expectations. Intercropping offers one possible route to support crop nutrition biologically, by pairing cereals with legumes that can fix atmospheric nitrogen.

What the trials tested

Researchers examined whether a winter wheat and faba bean intercrop could help maintain wheat grain protein while reducing fertiliser inputs. Across two growing seasons, the work compared a 50:50 wheat–bean mixture in different intercrop configurations against wheat and beans grown as monocrops.

Nitrogen inputs were set to reflect a lower-input approach. In the wheat-only crop, nitrogen was applied at a range of rates (from 0 up to 225kg N/ha). In the intercrop, wheat received half those rates, split into two applications.

What the trials found

In the 2023/24 season, the results indicated a clear grain-quality benefit when nitrogen availability was limited. At zero and low nitrogen rates, the wheat grown within the intercrop recorded around 1.4 percentage points higher grain proteinthan wheat grown alone.

Importantly for commercial decision-making, this improvement in grain quality did not automatically come with a yield penalty. At a reduced nitrogen level (67.5kg N/ha applied to the intercrop), wheat yields were 0.82t/ha higherthan comparable wheat-only plots in the same season.

However, the following year underlined why intercropping is not a “set-and-forget” solution. With severe drought conditions in 2024/25, the pulse crop struggled, limiting nitrogen fixation. While wheat yields still improved in some intercrop treatments, grain protein performance did not hold: at higher nitrogen rates, wheat grain protein fell by around 1.2 percentage points.

Across multiple seasons of project observations, cereals grown alongside legumes have been associated with around a 1% rise in grain protein content, with starch and sugar levels broadly comparable to monocrops. In nutritional terms, “protein yield” per hectare has also been reported as higher (driven by both improved cereal protein and the added pulse component), strengthening the case for feed markets and whole-system output.

Why season and management matter

The findings point to a central reality: intercropping performance is shaped by the balance between the two crops. In stronger cereal seasons — or where nitrogen rates rise — the cereal can suppress the pulse, reducing legume contribution and shifting how nitrogen is shared across the system.

In the trial work, higher nitrogen levels were linked with lower bean performance in the intercrop, with bean yields falling by up to 0.94t/hain some treatments due to competition from wheat. In a dry season, weaker legume performance further reduces the probability of a grain-protein uplift in the cereal.

Practical considerations for adoption

Intercropping can bring meaningful agronomic upside, but it also introduces practical hurdles:

• Drilling, crop protection and harvest timing become more complex when managing two crops in one field.

• For human food markets, separation, cleaning and storagecapacity can add cost and operational friction.

• Feed markets may reduce some separation pressure, but higher-value opportunities (such as premium specification cereals) depend on reliable handling and clear market routes.
  
  

What happens next

Intercropping remains a niche practice in many arable regions, but the direction of travel is clear: growers and supply chains are seeking production systems that protect quality while reducing reliance on synthetic inputs. UK research plots established at the University of Reading farm in Sonning, Berkshire are continuing to measure yield, grain quality, nitrate leaching and greenhouse gas impacts as part of the broader European intercropping programme.

For growers considering a trial, the emerging message is pragmatic: intercropping can pay in the right year — particularly under nitrogen-limited conditions — but it works best as a managed strategy, not a blanket replacement for conventional approaches.

UK Food Council will continue to track the evidence and the market implications for millers, bakers, feed buyers and growers as these trials expand.