Data for the paper: Modelling metal uptake by selected vegetables from urban soils in Europe: Uncovering key soil factors using Partial Least Squares Regression (PLS-R)

Data collection 1

• Mode of collection: Measurements and tests
• Description of the mode of collection: Field sampling of soil samples was conducted from cultivation plots in six different urban regions in Europe: Copenhagen, Denmark; Widnes, UK; Malmö, Sweden; Madrid, Spain; Pribram, Czech Republic; Berlin, Germany.
• Time period(s) for data collection: 2019-12-01 – 2021-03-31
• Instrument: Stainless-steel hand trowel (Other)
• Instrument: Plastic bucket (Other)

Data collection 2

• Mode of collection: Field/Intervention experiment
• Description of the mode of collection:
  Three vegetables; lettuce, chard, and carrot, was cultivated in a greenhouse, in the collected soils.
  Plant parts were harvested, washed, and dried in a drying cabinet at 60 degrees Celsius for 24 hours before chemical analysis.
  Soil samples were sieved to < 2 mm size. Following this, pH measurement and determination of organic content were conducted using loss-of-ignition (580 degrees Celsius) at Linnaeus University in Kalmar on a subset of the samples. The remaining soil was dried in drying cabinets at 60 degrees Celsius for 24 hours, and then sent to ALS Scandinavia AB in Luleå for chemical analyses.
  All analysis methods applied to plants and soils are described in the post's PDF document.
• Time period(s) for data collection: 2020-12-01 – 2021-05-31
• Instrument: Pot (Other) - One liter plastic pots were used for cultivation.
• Instrument: Greenhouse (Technical instrument(s)) - Greenhouse indoors with constant temperature at 18-20 degrees Celcius and 60% air humidity. Irrigation was conducted manually, on demand. Daylight + artificial light was applied during 8-9 hours per day.