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Table 2 Recovery of root segments buried in different substrates measured with MRI

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

Substrate NMR soil Sp2.1 Sp2.2 Sp2.3 Sp2.4 Sp5M Sp6S Brown’s soil
Seminal roots unprocessed soil 4 4 4 4 3 4 2 4
Seminal roots demag. soil N/A 4 4 4 4 4 1 N/A
Lateral roots unprocessed soil 3 4 4 3 0 0 0 4
Lateral roots demag. soil N/A 4 4 4 0 0 0 N/A
  1. From an excavated root system lateral roots (diameter 250–350 µm) and seminal roots (diameter 750–1000 µm) were selected. For each class, four 1 cm long root segments were buried in soil and measured with MRI. Listed are the numbers of visually detectable root segments in unprocessed and demagnetized substrates