Agriculture Reference
In-Depth Information
0
1
2
60
50
40
3
30
2 days
5 days
10 days
20
10
4
0
02468 0
Time (days)
5
012345
67
0
1
2
3
4
5
6.8
7.0
7.2
7.4
7.6
7.8
[NH
4
-N] (mmol dm
−
3
soil)
[Urea-N] (mmol dm
−
3
soil)
Soil pH
Figure 8.9
Profiles of urea-N, ammoniacal-N and pH with depth following broadcast application of urea on ricefield floodwater, and the
corresponding rates of NH
3
volatilization (calculated with the model of Rachhpal-Singh and Kirk, 1993a,b)
