Benefits of topdressing pastures to the rotation (wheat)
Aim
To demonstrate the nitrogen benefit to barley from growing productive pasture beforehand with Super Phos.
Soil Analysis results
|
Soil Type
|
Depth
|
OC
|
ECEC
|
Nit N
|
P
|
PBI
|
K
|
S
|
pH
|
|
Marri gravelly loam
|
0-10cm
|
3.8
|
5.3
|
14
|
42
|
459
|
213
|
9
|
4.9
|
Plant Analysis results
Soil N supply exceptional. All other nutrients adequate.
Harvest results
|
|
2005, 2006 and 2007
|
Barley
|
|
|
Pasture
|
Banded
|
Z14
|
Z30
|
|
|
Yield
|
Protein
|
|
|
(kg/ha)
|
(kg/ha)
|
(l/ha)
|
(l/ha)
|
N
|
P
|
(t/ha)
|
(%)
|
|
1
|
Nil
|
200 Big Phos
|
-
|
-
|
0
|
27
|
4.12
|
7.9
|
|
2
|
100 Super Phos
|
200 Big Phos
|
-
|
-
|
0
|
27
|
4.31
|
7.9
|
|
3
|
Nil (200 Super 05 & 06)
|
200 Big Phos
|
-
|
-
|
0
|
27
|
4.34
|
7.6
|
|
4
|
300 Super Phos
|
200 Big Phos
|
-
|
-
|
0
|
27
|
4.36
|
8.0
|
|
5
|
300 Super Phos + 2t Lime (06)
|
200 Big Phos
|
-
|
|
0
|
27
|
4.25
|
8.1
|
|
6
|
300 Super Phos + 2t Lime (06)
|
200 Big Phos
|
100 Flexi-N
|
100 Flexi-N
|
84
|
27
|
4.79
|
9.4
|
|
|
|
|
|
|
|
Prob
|
<0.001
|
<0.001
|
|
|
|
|
|
|
|
LSD
|
0.40
|
0.9
|
Key results
- Background N reserves were strong and sufficient to grow more than 4t/ha
- Leaf disease probably contributed to low protein levels
- No response to lime applied in 2006.
For further information on this trial
contact your local area manager.