Agriculture Reference
In-Depth Information
34% in first season and 96% in the second season, compared to treatments where N was not
applied.
In the first season addition of 22.5 kg P ha
-1
in unlimed plots increased nodule number in
comparison to the treatment where no P had been applied (Table 4). In the second season
addition of 7.5 kg P ha
-1
increased nodule number in limed treatments with no N addition
(Table 4), but a further increase in P application had no significant effect. Increasing P rate
had no significant effect on nodule number in treatments where AN had been applied (Table
4).
Liming improved NDMY by an overall average percentage increase 31% and 81% in the
first and second seasons, respectively (Table 5). Application of 30 kg AN ha
-1
reduced
NDMY by an overall average of 60% and 98% in the first and second season, respectively,
compared to treatments where AN had not been applied. Phosphorus rate had no significant
(p > 0.05) effect on NDMY in the first season. In the second season in treatments where lime
and AN had not been applied, a significant increase in NDMY occurred when 22.5 kg P ha
-1
had been applied compared to the treatment where no P had been applied (Table 5). In the
limed plots, a change in P application rate from 0 to 7.5 kg P ha
-1
increased yield, but a
further increase in P rate had no significant effect.
Table 4. Effect of liming, N and P fertilisation of nodule numbers of a selected soybean
cultivar
Nodule numbers (Nodules 10 plants
-1
)
2002/2003
2003/2004
P application rate
(kg ha
-1
)
-Lime
+Lime
-Lime
+Lime
-N
+N
-N
+N
-N
+N
-N
+N
0
6.3
7.1
8.9
5.2
9.5
0
12.5
1.0
7.5
8.4
7.2
10.3
5.3
11.2
0.7
22.1
1.9
15
3.0
7.5
9.5
5.6
16.9
0.9
17.9
0.5
22.5
10.3
5.2
11.5
5.7
11.3
0.2
23.4
0
LSD
(P<0.05)
Lime
N
P
Lime x N
N x P
Lime x P
N x P x Lime
1.24
1.33
NS
1.56
2.44
NS
NS
2.15
1.90
2.57
2.04
NS
NS
NS
N rates: -N = 0 kg N ha
-1
; +N = 30 kg N ha
-1
.
NS - Not significant.
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