Nitrogen Use Efficiency and Gaseous Nitrogen Losses from the Concentrated Liquid Fraction of Pig Slurries
Table 3
N uptake of grass (sum 1st and 2nd cut), apparent N recovery (ANR), nitrogen fertilizer replacement value (NFRV)2, total N2O emission during the pot experiment, and average NH3 emissions at the first day, at 50, 60, and 80% of the soil water holding capacity (WHC).
Treatment
N uptake (m−2)
ANR (%)
NFRV (%)
N2O (mg N m−2)
NH3 (g N m−2 day−1)
50%
60%
80%
50%
60%
80%
50%
60%
80%
50%
60%
80%
50%
60%
80%
Control
0.4
0.3
0.5
a
2
5
6
ab
0
0
0
CAN, surface-applied
4.9
5.3
6.0
d
43
47
52
bc
82
90
100
bc
17
11
19
c
0
0
0
Liquid NH4NO3, surface-applied
5.1
5.4
6.1
d
45
48
53
c
87
93
101
c
−2
2
10
a
0
0
0
Pig slurry, incorporated
3.4
3.9
4.5
c
30
36
39
a
58
69
76
a
12
21
34
d
0.2
0.1
0.1
MC, surface-applied
2.6
3.1
3.0
b
33
41
38
a
64
79
72
a
3
11
6
ab
0.9
0.3
0.3
MC, incorporated
3.3
3.5
3.8
c
44
48
49
bc
84
93
93
bc
9
3
16
b
0.1
0.2
0.4
Mixture pig slurry and MC, incorporated
3.6
3.8
4.1
c
39
42
43
ab
74
80
82
ab
17
11
37
d
0.4
0.2
0.2
Acidified MC, surface-applied
3.3
3.5
4.2
c
43
48
55
c
83
93
106
c
−1
−3
10
a
0
0
0
ANOVA1
a
a
b
a
ab
b
a
ab
b
a
a
b
N source
<0.001
<0.001
<0.001
<0.001
χ2 < 0.001
Moisture
<0.001
0.012
0.012
<0.001
χ2 = 0.407
N source ∗ moisture
0.948
0.998
0.998
0.002
1Values within columns with different treatments and different subscripts differ significantly () and values in this row with different soil moisture contents and with different letters differ significantly ().2Values are calculated as the relative ANR compared to the ANR at CAN 80% WHC.
