Table 3 Pool sizes of NO3 and NH4+ in different soil depths of the individual catch crop variants.

From: Interspecific competition among catch crops modifies vertical root biomass distribution and nitrate scavenging in soils

  Control Mustard Phacelia Oat Clover Mix
Asendorf 2015
NO 3 -N [g]
0–10 cm 0.68 ± 0.10a 0.26 ± 0.13b 0.19 ± 0.09b 0.23 ± 0.12b 0.33 ± 0.07b 0.22 ± 0.10b
20–30 cm 2.66 ± 0.14a 0.17 ± 0.09b 0.21 ± 0.07b 0.19 ± 0.09b 2.14 ± 0.21a 0.20 ± 0.04b
50–60 cm 1.87 ± 0.73a 0.75 ± 0.24c 0.89 ± 0.10c 1.03 ± 0.23b 1.55 ± 0.66ab 0.97 ± 0.26c
NH 4 + -N [g]
0–10 cm 0.22 ± 0.21ns. 0.45 ± 0.31 0.18 ± 0.07 0.21 ± 0.22 0.14 ± 0.14 0.25 ± 0.02
20–30 cm 0.13 ± 0.17ns. 0.17 ± 0.13 0.24 ± 0.24 0.21 ± 0.15 0.19 ± 0.27 0.21 ± 0.10
50–60 cm 0.07 ± 0.09ns. 0.15 ± 0.13 0.04 ± 0.07 0.07 ± 0.06 0.08 ± 0.14 0.11 ± 0.06
Asendorf 2016
NO 3 -N [g]
0–10 cm 4.45 ± 0.44a 0.16 ± 0.04b 0.04 ± 0.02b 0.08 ± 0.07b 0.24 ± 0.13b 0.06 ± 0.03b
20–30 cm 2.36 ± 1.08a 0.13 ± 0.09b 0.09 ± 0.07b 0.06 ± 0.06b 0.66 ± 0.26b 0.01 ± 0.01b
50–60 cm 0.58 ± 0.18ns. 0.14 ± 0.06 0.04 ± 0.05 0.15 ± 0.10 0.37 ± 0.25 0.07 ± 0.06
NH 4 + -N [g]
0–10 cm 0.08 ± 0.07b 0.31 ± 0.01a 0.19 ± 0.04ab 0.20 ± 0.03ab 0.26 ± 0.10b 0.22 ± 0.04ab
20–30 cm 0.11 ± 0.05ns. 0.12 ± 0.03 0.11 ± 0.04 0.16 ± 0.02 0.20 ± 0.02 0.15 ± 0.01
50–60 cm 0.11 ± 0.09ns. 0.09 ± 0.08 0.11 ± 0.01 0.04 ± 0.07 0.07 ± 0.06 0.11 ± 0.01
Triesdorf 2015
NO 3 -N [g]
0–10 cm 1.05 ± 0.23a 0.27 ± 0.01b 0.26 ± 0.03b 0.24 ± 0.08b 0.29 ± 0.05b 0.31 ± 0.05b
20–30 cm 0.70 ± 0.24a 0.11 ± 0.03b 0.11 ± 0.05b 0.015 ± 0.10b 0.30 ± 0.12b 0.09 ± 0.03b
50–60 cm 0.21 ± 0.01a 0.05 ± 0.01c 0.08 ± 0.06b 0.19 ± 0.01a 0.18 ± 0.05ab 0.06 ± 0.04c
NH 4 + -N [g]
0–10 cm 0.10 ± 0.10ns. 0.11 ± 0.02 0.07 ± 0.06 0.05 ± 0.05 0.07 ± 0.04 0.08 ± 0.03
20–30 cm 0.06 ± 0.06ns. 0.07 ± 0.07 0.08 ± 0.02 0.02 ± 0.04 0.02 ± 0.04 0.13 ± 0.07
50–60 cm 0.03 ± 0.01ns. 0.10 ± 0.07 0.03 ± 0.02 0.06 ± 0.06 0.03 ± 0.05 0.11 ± 0.02
Triesdorf 2016
NO 3 -N [g]
0–10 cm 0.54 ± 0.11a 0.26 ± 0.02b 0.25 ± 0.07b 0.66 ± 0.37a 0.32 ± 0.06b 0.39 ± 0.22a
20–30 cm 2.15 ± 0.20a 0.13 ± 0.02c 0.13 ± 0.03c 0.17 ± 0.05c 0.90 ± 0.21b 0.14 ± 0.06c
50–60 cm 0.30 ± 0.04ns. 0.05 ± 0.05 0.05 ± 0.03 0.27 ± 0.11 0.21 ± 0.04 0.07 ± 0.03
NH 4 + -N [g]
0–10 cm 0.16 ± 0.07ns. 0.15 ± 0.05 0.11 ± 0.05 0.10 ± 0.06 0.11 ± 0.03 0.16 ± 0.09
20–30 cm 0.05 ± 0.02ns. 0.04 ± 0.03 0.06 ± 0.04 0.05 ± 0.06 0.04 ± 0.05 0.01 ± 0.01
50–60 cm 0.03 ± 0.02ns. 0.02 ± 0.02 0.02 ± 0.02 0.07 ± 0.06 0.03 ± 0.03 0.02 ± 0.02
  1. Samples of 0.1 m−3 were taken from 3 plots at 3 different soil depths for extraction of nutrient pools. Numbers show means ± s.d., n = 3. Control represents fallow plots. Different letters indicate significant differences among soil NO3 or NH4+ pools of individual catch crop variants at one depth according to Tukey’s test on ranks at p < 0.05; ns. = not significant.