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Table 1 Soil classification and physical soil properties of the used substrates (mean ± standard deviation, N = 4)

From: Non-invasive imaging of plant roots in different soils using magnetic resonance imaging (MRI)

Substrate (short name) NMR soil Sp2.1 Sp2.2 Sp2.3 Sp2.4 Sp5M Sp6S Brown’s soil
Substrate (full name) N/A Sp2.12915 Sp2.22915 Sp2.33015 Sp2.42915 Sp5M2915 Sp6S2915 N/A
Soil texture according German DIN Sand Silty sand Loamy sand Silty sand Clayey loam Loamy sand Clayey loam Loamy sand
Dry density (g/cm3) 1.84 ± 0.05 1.62 ± 0.06 1.25 ± 0.07 1.57 ± 0.05 1.10 ± 0.02 1.36 ± 0.02 1.20 ± 0.08 1.39 ± 0.02
Density at WHCmax (g/cm3) 1.69 ± 0.04 1.43 ± 0.05 1.13 ± 0.02 1.36 ± 0.05 1.00 ± 0.03 1.21 ± 0.02 1.08 ± 0.07 1.26 ± 0.03
WHCmax (%vol) 26.3 ± 0.4 31.8 ± 0.7 35.9 ± 0.6 33.5 ± 0.4 36.1 ± 0.6 35.8 ± 0.5 36.1 ± 1.2 32.9 ± 0.4
WHCmax (%mass) 15.6 ± 0.4 22.3 ± 1.3 31.9 ± 0.8 24.6 ± 0.9 36.2 ± 0.6 29.7 ± 0.6 33.6 ± 1.2 26.1 ± 0.8
Ferromagnetic particles content (%mass) N/A 2.5 2.1 2.5 11.7 5.3 25.3 N/A
  1. The denoted short names are used in the text