Diversifying crop rotations with temporary grasslands - Université de ...

Table 8: Organic carbon and total nitrogen concentrations in two soil layers 7 weeks after the beginning of the
experiment and after two years.
Date Soil horizon n
Organic C
[g/kg]
78
Total N
[g/kg]
C/N
NO3-N
NH4-N
[mg/kg] [mg/kg]
Mean ±SD Mean ±SD Mean Mean
18.10.2006 1 (0-30cm) 12 17.4 ±1.4 1.7 ±0.2 10.4 5.48 0.17
2 (30-60cm) 12 13.0 ±2.4 1.3 ±0.3 9.9 7.98 0.47
12.11.2008 1 (0-30cm) 36 17.3 ±1.7 2.0 ±0.2 8.6 1.06 1.90
2 (30-60cm) 36 11.0 ±1.6 1.4 ±0.2 8.2 0.80 1.27
Fig. 11 shows the spatial variation of the chemical soil parameters on the experimental field.
Both organic carbon and total nitrogen concentrations were rather homogeneous but showed a
weak gradient with slightly higher values on the plots on the southern part of the field (Fig.
11).
Repetition
Repetition
0
1
2
3
4
5
0
1
2
3
4
5
North
0
A) Organic carbon [g/kg] Oct. 2006 B) Total nitrogen [g/kg] Oct. 2006
0.84
1.17 1.12
1
8.7 11.6 11.0
1.37 1.59 1.47
15.2 16.5 17.3
1.19 1.39 1.38
2 13.9
14.7 14.2
1.42 1.64 1.72
15.1
17.5 17.6
1.02 1.29 1.69 4
9.9 12.4 15.2
1.72 1.69 1.93
17.8 16.4 19.1
West
1.40
1.77
1.60
1.85
1.66
1.86
South
5
West
12.3
18.7
15.5
19.2
16.6
17.9
South
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
North
0
C) Organic carbon [g/kg] Nov. 2008 D) Total nitrogen [g/kg] Nov. 2008
1.31 1.27 1.07 1.23 1.43 1.41 1.34
1.75 1.72 1.86 1.88 2.06 2.10 2.12
1.30 1.24 1.36 1.39 1.54 1.64 1.15 1.54
1.18
1.99 1.81 1.90 2.11 2.11 2.15 2.35
1.41 1.01 1.30 1.33 1.38 1.27 1.53 1.77
1.79 2.02 2.11 2.12 2.00 2.17 2.16 1.90
1.19 1.38 1.29
1.48 1.24 1.23
2.14 2.18 2.25 2.32 2.09 2.14
West
1.92
2.18 South
1 2 3 4 5 6 7 8 9
Parcel
East
East
3
1
2
3
4
5
North
North
Soil layer 1 (0-30cm)
Soil layer 2 (30-60cm)
10.3 11.0 8.7 10.2 12.6 11.9 10.8
15.0 15.6 15.8 17.9 17.5 18.3 17.5
10.8 10.2 9.7 11.3
13.7 12.1 9.6 13.6
16.5 17.7 13.8 16.5 17.0 18.5 14.4 19.4
11.3 7.9 10.4 11.0 11.5 9.4 12.8 14.3
16.2 16.4 18.6 19.0 17.3 18.4 18.9 19.8
10.3 11.4 10.7
10.9 10.8 10.9
18.5 16.3 18.2 19.8 17.0 18.0
West
14.2
20.4 South
1 2 3 4 5 6 7 8 9
Parcel
Fig. 11: Spatial heterogeneities of organic carbon and total nitrogen concentrations in the soil of the experimental
field in October 2006 and November 2008.
The spatial arrangement (North-East-South-West) with 5 ‘Repetitions’ and 9 ‘Parcels’ corresponds to Fig. 10.
The surface of the circles corresponds to the concentrations in g per kg of soil.
East
East