Nitrogen and phosphorus on barley after canola (versus wheat)
Location
Frankland
Aim
To compare nitrogen (N) and phosphorous (P) responses in barley after canola and wheat.
Soil Analysis results
| Soil Type |
Depth
(cm)
|
OC
(%)
|
ECEC
(meq/100g)
|
Nit N
(mg/kg)
|
P
(mg/kg)
|
PBI
|
K
(mg/kg)
|
S
(mg/kg)
|
pH
(CaCl2)
|
|
Marri gravelly loam
|
0-10
|
4.6
|
8.2
|
13
|
40
|
155
|
120
|
12
|
4.9
|
|
|
10-20
|
1.3
|
6.0
|
3
|
9
|
209
|
227
|
11
|
5.6
|
Plant Analysis results
Nitrogen and phosphorus confirmed as limiting nutrients. Reduced recovery of nutrients following canola.
Harvest results
| |
2007 Crop |
Treatment
Banded |
Z14
(L/ha)
|
Z30
(L/ha)
|
N |
P |
Harvest
|
Yield
(t/ha)
|
Protein
(%)
|
|
(L/ha)
|
(Kg/ha)
|
|
1
|
Wheat
|
-
|
-
|
-
|
-
|
0
|
0
|
4.23
|
10.1
|
|
2
|
Wheat
|
-
|
180 Double Phos
|
-
|
-
|
0
|
32
|
6.39
|
9.4
|
|
3
|
Wheat
|
50 Flexi-N
|
180 Double Phos
|
50 Flexi-N
|
100 Flexi-N
|
84
|
32
|
6.39
|
10.0
|
|
4
|
Wheat
|
50 Flexi-N
|
-
|
50 Flexi-N
|
100 Flexi-N
|
84
|
0
|
5.01
|
10.7
|
|
5
|
Wheat
|
50 Flexi-N
|
45 Double Phos
|
50 Flexi-N
|
100 Flexi-N
|
84
|
8
|
5.98
|
10.1
|
|
6
|
Wheat
|
50 Flexi-N
|
90 Double Phos
|
50 Flexi-N
|
100 Flexi-N
|
84
|
16
|
6.13
|
10.8
|
|
|
|
|
|
|
|
|
Prob
|
<0.001
|
0.491
|
|
|
|
|
|
|
|
LSD
|
0.44
|
nsd
|
|
|
7
|
Canola
|
-
|
-
|
-
|
-
|
0
|
0
|
2.99
|
9.7
|
|
8
|
Canola
|
-
|
180 Double Phos
|
-
|
-
|
0
|
32
|
4.86
|
9.6
|
|
9
|
Canola
|
50 Flexi-N
|
180 Double Phos
|
50 Flexi-N
|
100 Flexi-N
|
84
|
32
|
5.73
|
9.7
|
|
10
|
Canola
|
50 Flexi-N
|
-
|
50 Flexi-N
|
100 Flexi-N
|
84
|
0
|
3.41
|
9.3
|
|
11
|
Canola
|
50 Flexi-N
|
45 Double Phos
|
50 Flexi-N
|
100 Flexi-N
|
84
|
8
|
4.53
|
9.3
|
|
12
|
Canola
|
50 Flexi-N
|
90 Double Phos
|
50 Flexi-N
|
100 Flexi-N
|
84
|
16
|
5.30
|
8.8
|
|
|
|
|
|
|
|
|
Prob
|
<0.001
|
0.565
|
|
|
|
|
|
|
|
LSD
|
0.48
|
nsd
|
Key results
- Harvest yields after canola were on average 1t/ha lower than after wheat
- Phosphorus increased yield by 1.4t/ha after wheat and by 2.3t/ha after canola
- There was no response to nitrogen after wheat, but a 0.87t/ha response after canola.
Related Products
For further information on this trial contact your local area manager.