Building consistent maincrop yield in UK potato crops
Trial data
Every maincrop programme is built around the same objective: secure tonnage, stable margins and reliable pack-out.
But in recent seasons, variability has made that harder to predict. Establishment conditions shift. Canopies respond differently. Yield potential becomes more sensitive to timing and stress.
So what does consistent uplift actually look like under commercial conditions?
Between 2022 and 2025, maincrop performance was measured across 53 commercial crops as part of a wider UK field trial programme. Rather than focusing on a single season, the data reflects four consecutive years of field performance.
Four seasons of maincrop yield performance
Across those 50 UK maincrop crops:
- 3.7 tonnes per hectare average yield increase
- 6.5% average yield uplift
- Control yield: 57.4 t/ha
- Treated yield: 61.1 t/ha
Treated yield was statistically different from untreated.
More importantly, yield uplift remained within a 6–8% range across the four-year period. This is equivalent to 3–4 tonnes per hectare.
That range is what defines the dataset.
Why range matters in maincrop systems
A one-year spike can be interesting.
A repeatable 6–8% uplift across seasons is far more useful from a planning perspective.
In maincrop production, a 3–4 t/ha improvement can influence:
- Grading volumes
- Contract security
- Storage allocation
- Cost per tonne
When that uplift stays within a predictable band over multiple years, it becomes a reference point rather than an anomaly.
Variety coverage and commercial relevance
The 50 maincrop crops included 22 commercially grown UK varieties, including Markies, Maris Piper, Melody, Innovator and Tyson.
Performance was measured under standard farm practice, across commercial fields, rather than under controlled conditions.
This provides a practical benchmark for maincrop growers assessing input performance over time.
What this means for maincrop planning
Across four seasons of UK commercial field data:
- Yield uplift averaged 3.7 t/ha
- Percentage increase averaged 6.5%
- Performance remained within a 6–8% band
Consistency in crops
For growers reviewing next season’s programme, that four-year consistency is often more relevant than any single headline figure.
For more detail download our complete 53 UK potato field trial dataset.
Download the dataMaxstim can help you achieve consistency across your potato crop, call a team member below to set up a trial today.
Tim Cannon
Email: tim.cannon@maxstim.com
Mobile: 07884 586191
Phil Kingsmill
Email: phil.kingsmill@maxstim.com
Mobile: 07860 269996
Leanne Taylor
Email: leanne.taylor@maxstim.com
Mobile: 07552 097554
Tony Kelly
Email: tony.kelly@maxstim.com
Mobile: 07974 435417
