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*
NO₃⁻-N [g]
0–10 cm	0.68 ± 0.10^a	0.26 ± 0.13^b	0.19 ± 0.09^b	0.23 ± 0.12^b	0.33 ± 0.07^b	0.22 ± 0.10^b
20–30 cm	2.66 ± 0.14^a	0.17 ± 0.09^b	0.21 ± 0.07^b	0.19 ± 0.09^b	2.14 ± 0.21^a	0.20 ± 0.04^b
50–60 cm	1.87 ± 0.73^a	0.75 ± 0.24^c	0.89 ± 0.10^c	1.03 ± 0.23^b	1.55 ± 0.66^ab	0.97 ± 0.26^c
NH₄⁺-N [g]
0–10 cm	0.22 ± 0.21^ns.	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 ± 0.17^ns.	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 ± 0.09^ns.	0.15 ± 0.13	0.04 ± 0.07	0.07 ± 0.06	0.08 ± 0.14	0.11 ± 0.06
*Asendorf 2016*
NO₃⁻-N [g]
0–10 cm	4.45 ± 0.44^a	0.16 ± 0.04^b	0.04 ± 0.02^b	0.08 ± 0.07^b	0.24 ± 0.13^b	0.06 ± 0.03^b
20–30 cm	2.36 ± 1.08^a	0.13 ± 0.09^b	0.09 ± 0.07^b	0.06 ± 0.06^b	0.66 ± 0.26^b	0.01 ± 0.01^b
50–60 cm	0.58 ± 0.18^ns.	0.14 ± 0.06	0.04 ± 0.05	0.15 ± 0.10	0.37 ± 0.25	0.07 ± 0.06
NH₄⁺-N [g]
0–10 cm	0.08 ± 0.07^b	0.31 ± 0.01^a	0.19 ± 0.04^ab	0.20 ± 0.03^ab	0.26 ± 0.10^b	0.22 ± 0.04^ab
20–30 cm	0.11 ± 0.05^ns.	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 ± 0.09^ns.	0.09 ± 0.08	0.11 ± 0.01	0.04 ± 0.07	0.07 ± 0.06	0.11 ± 0.01
*Triesdorf 2015*
NO₃⁻-N [g]
0–10 cm	1.05 ± 0.23^a	0.27 ± 0.01^b	0.26 ± 0.03^b	0.24 ± 0.08^b	0.29 ± 0.05^b	0.31 ± 0.05^b
20–30 cm	0.70 ± 0.24^a	0.11 ± 0.03^b	0.11 ± 0.05^b	0.015 ± 0.10^b	0.30 ± 0.12^b	0.09 ± 0.03^b
50–60 cm	0.21 ± 0.01^a	0.05 ± 0.01^c	0.08 ± 0.06^b	0.19 ± 0.01^a	0.18 ± 0.05^ab	0.06 ± 0.04^c
NH₄⁺-N [g]
0–10 cm	0.10 ± 0.10^ns.	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 ± 0.06^ns.	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 ± 0.01^ns.	0.10 ± 0.07	0.03 ± 0.02	0.06 ± 0.06	0.03 ± 0.05	0.11 ± 0.02
*Triesdorf 2016*
NO₃⁻-N [g]
0–10 cm	0.54 ± 0.11^a	0.26 ± 0.02^b	0.25 ± 0.07^b	0.66 ± 0.37^a	0.32 ± 0.06^b	0.39 ± 0.22^a
20–30 cm	2.15 ± 0.20^a	0.13 ± 0.02^c	0.13 ± 0.03^c	0.17 ± 0.05^c	0.90 ± 0.21^b	0.14 ± 0.06^c
50–60 cm	0.30 ± 0.04^ns.	0.05 ± 0.05	0.05 ± 0.03	0.27 ± 0.11	0.21 ± 0.04	0.07 ± 0.03
NH₄⁺-N [g]
0–10 cm	0.16 ± 0.07^ns.	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 ± 0.02^ns.	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 ± 0.02^ns.	0.02 ± 0.02	0.02 ± 0.02	0.07 ± 0.06	0.03 ± 0.03	0.02 ± 0.02

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.

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

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