Agriculture Reference
In-Depth Information
7
7.2
12
Soil Org C Active
(%) Fe (%)
7.0
6
10
6.8
10 1.5 1.67
21 4.1 2.78
26 1.5 0.30
30 5.1 1.2
5
6.6
8
4
6.4
3
6.2
6
6.0
2
4
5.8
1
5.6
2
0
5.4
−
1
5.2
0
02468 0 2 4 6
02468 0 2 4 6
02468 0 2 4 6
Time (weeks after flooding)
Figure 4.5
Changes in pe, pH and Fe
2
+
in soil solutions of various soils following submergence at 25
◦
C. pe values are calculated from
measured
E
H
(V) values in soil solutions. Data from IRRI (1964). Reproduced by permission of IRRI
