Residual phosphorus responses in wheat
Location
Calingiri
Aim
To assess the residual value of phosphorus fertiliser applied to canola in 2006 to wheat in 2007.
Soil Analysis results
|
Soil Type
|
Depth
(cm)
|
OC
(%)
|
Nit N
(mg/kg)
|
Amm N
(mg/kg)
|
P
(mg/kg)
|
Fe
|
K
(mg/kg)
|
S
(mg/kg)
|
pH
(caCl2)
|
|
White Gum loam
|
0-10cm
|
1.9
|
13
|
3
|
31
|
413
|
122
|
5
|
5.0
|
Plant Analysis results
Phosphorus was the only limiting nutrient.
Harvest results
|
|
2007 Wheat
|
2006 Canola
|
|
|
|
|
Yield
|
Protein
|
|
|
Yield
|
Oil
|
|
Trt
|
N
|
P
|
(t/ha)
|
(%)
|
N
|
P
|
(t/ha)
|
(%)
|
|
1
|
68
|
0
|
2.21
|
11.4
|
50
|
0
|
1.42
|
47.1
|
|
2
|
68
|
0
|
2.35
|
11.2
|
50
|
12
|
1.68
|
47.6
|
|
3
|
68
|
0
|
2.21
|
11.7
|
150
|
0
|
1.74
|
44.7
|
|
4
|
68
|
0
|
2.31
|
11.9
|
150
|
12
|
2.11
|
45.4
|
|
5
|
68
|
12
|
2.88
|
11.4
|
100
|
12
|
1.91
|
45.9
|
|
|
Prob
|
<0.001
|
<0.001
|
|
|
<0.001
|
<.001
|
|
|
LSD
|
0.142
|
0.46
|
|
|
0.18
|
0.99
|
Key results
- 12 kg P/ha applied in 2006 increased 2007 wheat yields by 0.10 to 0.14 t/ha
- 12 kg P/ha applied in 2007 after 12 kg P/ha in 2006 increased wheat yield by 0.5-0.6 t/ha
- There was no residual nitrogen carry over from 2006 (data not presented).
For further information on this trial
contact your local area manager.