Agriculture Reference
In-Depth Information
7
Iloilo
6
Fe
2
+
5
4
3
Ca
2
+
Mg
2
+
NH
4
+
2
Na
+
1
K
+
Mn
2
+
0
16
14
Maahas
12
10
Ca
2
+
8
Mg
2
+
6
4
Na
+
Fe
2
+
2
0
20
Nueva Ecija
15
Ca
2
+
10
Mg
2
+
5
Na
+
Fe
2
+
0
6
Tarlac
5
Ca
2
+
4
3
Mg
2
+
2
Na
+
1
Fe
2
+
0
0
20
40
60
80
Time after flooding (days)
Figure 3.7
Changes in the concentrations of cations in solution following flooding of
four rice soils (Kirk
et al
., 2003). The corresponding changes in
E
H
, pH, HCO
3
−
,CEC
and soil Fe are shown in Figures 2.6 and 2.7. Reproduced by permission of Blackwell
Publishing
