Agriculture Reference
In-Depth Information
800
35
(a) straw
(b) urea
28
600
continuous
f
looding
drainage
(arrows)
21
400
14
200
7
0
0
2.0
6
(c) straw
(d) urea
1.5
4
1.0
2
0.5
0.0
0
0
20
40
60
80
100
0
20
40
60
80
100
Days after transplanting
Figure 8.7
Emissions of CH
4
and N
2
O during a rice crop with different water, straw and
fertilizer managements. Single upward arrow
=
drainage; double downward arrow
=
flood
irrigation (Bronson
et al
., 1997a). Reproduced by permission of Soil Sci. Soc. Am.
5
5
Geen manure
Straw
Urea
4
4
Ammonium sulfate
3
3
2
2
1
1
0
0
80
80
60
60
40
40
20
20
0
0
0
6
12
18
24
30
36
0
6
12
18
24
30
36
Days after harvest
Figure 8.8
Emissions of CH
4
and N
2
O during a fallow between rice crops. Single
arrow
=
=
rainfall; double arrow
flood irrigation (Bronson
et al
., 1997b). Reproduced by
permission of Soil Sci. Soc. Am.
