Agriculture Reference
In-Depth Information
6.5
6.5
B
2002-03 (+ Lime)
2002-03 (- Lime)
A
6.0
-N: y = 3.57 + 0.12x - 0.0010x
2
+ 2.09e
-4
x
3
+N: y = 3.45 + 0.11x - 0.011x
2
+ 2.68e
-4
x
3
6.0
-N: y = 3.57 + 0.12x - 0.0098x
2
+ 2.09e
-4
x
3
+N: y = 3.45 + 0.11x - 0.011x
2
+ 2.68e
-4
x
3
5.5
5.5
5.0
5.0
lsd
lsd
- N
+ N
- N
+ N
4.5
4.5
4.0
4.0
3.5
3.5
3.0
3.0
2.5
2.5
0.0
7.5
15.0
22.5
0.0
7.5
15.0
22.5
7.0
7.0
C
2003-04 (+ Lime)
D
2003-04 (- Lime)
6.5
6.5
-N: y = 3.86 + 0.13x - 0.017x
2
+ 4.53e
-4
x
3
+N: y = 2.17 + 0.12x + 5.06e
-4
x
2
- 1.22e
-4
x
3
-N: y = 3.57 + 0.12x - 0.0098x
2
+ 2.09e
-4
x
3
+N: y = 3.45 + 0.11x - 0.011x
2
+ 2.68e
-4
x
3
6.0
6.0
5.5
5.5
5.0
lsd
5.0
- N
+ N
lsd
- N
+ N
4.5
4.5
4.0
4.0
3.5
3.5
3.0
3.0
2.5
2.5
2.0
2.0
1.5
1.5
0.0
7.5
15.0
22.5
0.0
7.5
15.0
22.5
P application rate (kg ha
-1
)
P application rate (kg ha
-1
)
Figure 4. Effect of liming acid soil (B and D), and N and P fertilizer application on the grain yield of an
acid-sensitive soybean cultivar. (Error bars represent least significant difference of means at 95%
confidence).
Liming and increasing P rate had no significant effect on stover yield at harvesting in
both cropping seasons (p > 0.05) (Figure 5). In the limed plots, application of 30 kg N ha
-1
reduced stover yield (overall average 10% and 19% in first and second season, respectively)
compared to treatments where no N was applied (Figure 5B and 5D). In the unlimed plots
there was no significant difference between application of 0 and 30 kg N ha
-1
(Figure 5A and
3C).
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