Agriculture Reference
In-Depth Information
N-Nh 4 +
45
b
40
35
30
25
I
II
20
a
15
a
10
a
5
0
t1
to
time
-
N-NO 3
60
b
50
40
a
I
II
30
20
a
a
10
0
to
t1
time
Figure 3. Ammonium and nitrate concentration before (to, November 2001) and after the incubation (t1,
May 2002). Different letters indicate significant differences between stratum I and stratum II (p<0.05).
Asterisks indicate significant differences between to and t1 in the same stratum.
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