Lab results · Oranges · 2025–26
Finca La Muestra, round 1
- Sampled 10 March 2026
- Valencia Late
- ISO/IEC 17025
- Ribera Alta, Valencia
In plain language
What stands out
- Vitamin C, polyphenols and antioxidant capacity sit in the upper third of the reference range and above the same-week retail sample.
- Nitrate is in the lower part of the range and clearly below the retail sample.
What doesn’t
- Calcium, zinc and carotenoids are close to the reference median and to the retail sample.
- Iron sits slightly below the median, but the amounts are near what the lab can measure reliably.
Keep in mind
- One sampling round from one season. A dry winter can concentrate some compounds, so the next round matters.
- The retail sample’s age from harvest is unknown, and vitamin C declines in storage.
- These figures describe this sample. They say nothing about how the fruit affects anyone’s health.
Results by marker
Each bar is the national reference range for this crop, from the 10th to the 90th percentile. The dot shows this farm’s sample, the ring the same-week retail sample. Real reports also list the measured values.
A Panel Core
- Vitamin C
- vs retail
- +22%
- vs reference median
- +14%
- Brix (sugars)
- vs retail
- +9%
- vs reference median
- +6%
- Acidity
- vs retail
- −4%
- vs reference median
- +1%
- Dry matter
- vs retail
- +5%
- vs reference median
- +3%
- Potassium (K)
- vs retail
- +11%
- vs reference median
- +8%
- Calcium (Ca)
- vs retail
- +2%
- vs reference median
- −3%
- Magnesium (Mg)
- vs retail
- +7%
- vs reference median
- +4%
- Iron (Fe)Close to the lab’s limit of quantification, so small differences are uncertain.
- vs retail
- −6%
- vs reference median
- −9%
- Zinc (Zn)
- vs retail
- ±0%
- vs reference median
- −2%
B Panel Extended
- Polyphenols
- vs retail
- +18%
- vs reference median
- +12%
- Antioxidant capacity
- vs retail
- +15%
- vs reference median
- +10%
- Carotenoids
- vs retail
- +3%
- vs reference median
- −1%
- Nitrate
- vs retail
- −31%
- vs reference median
- −20%
C Panel Full Not tested in this round
The Full panel (residue screen, heavy metals, shelf-life) wasn’t funded in round 1.
Context
- Tree age
- 18–25 years, on Citrange Carrizo rootstock
- Harvest
- 9 March 2026, picked by hand in the morning
- Weather
- A dry winter: 41% of normal rainfall from December to February
- Harvest to lab
- 2 days for the farm sample; retail sample age unknown (bought 10 March)
- Irrigation
- Drip, about 15% below the regional average this season
- Fertilisation
- Compost only since 2021; no synthetic nitrogen this season
Sample
- Sampled
- 10 March 2026
- Received at lab
- 11 March 2026
- Variety
- Valencia Late
- Sampling
- 30 fruits drawn at random from three outgoing shipments by an independent sampler; 30 fruits of the same variety bought at retail the same week. Both sealed, logged and couriered chilled.
- Lab
- Accredited food lab (name shown in real reports)
- Accreditation
- ISO/IEC 17025, accredited for each method used
- Protocol
- Dos Tomates citrus protocol v0.3 (draft)
- References
- National food composition table (example)Same-variety oranges bought at a supermarket in Valencia the same week (example)
Scientific review
Reviewer’s name appears hereIndependent scientific reviewer (placeholder)
PendingSign-off appears here once the reviewer has checked the method and the report.
Open data
Reports a farm agrees to publish will also be available as CSV and JSON. Anonymised results from every test feed the open reference for researchers. Downloads arrive in a later phase.