Nitrogen and phosphorous responses in wheat
Aim
To investigate Nitrogen (N) and Phosphorous (P) responses in wheat.
Soil Analysis results
|
Soil Type
|
Depth
|
OC
|
Nit N
|
Amm N
|
ECEC
|
P
|
PBI
|
K
|
S
|
pH
|
|
Mallee sandy loam
|
0-10
|
1.3
|
3
|
4
|
2
|
18
|
13
|
57
|
7
|
4.5
|
|
|
10-20cm
|
0.7
|
1
|
1
|
3
|
7
|
9
|
92
|
3
|
4.9
|
Plant Analysis results
P identified as the major limiting nutrient. All other nutrients adequately supplied.
Harvest results
|
|
Banded
(l or kg/ha)
|
N
|
P
|
Yield (t/ha)
|
Protein (%)
|
|
1
|
-
|
Nil
|
0
|
0
|
1.20
|
11.4
|
|
2
|
-
|
65 Agstar
|
9
|
9
|
1.73
|
10.3
|
|
3
|
50 Flexi-N
|
65 Agstar
|
30
|
9
|
1.62
|
12.1
|
|
4
|
-
|
110 Agstar
|
16
|
15
|
1.92
|
10.5
|
|
5
|
33 Flexi-N
|
110 Agstar
|
30
|
15
|
2.05
|
9.8
|
|
|
|
|
Prob
|
<0.001
|
<0.001
|
|
|
|
|
LSD
|
0.14
|
0.8
|
Key results
- 110kg/ha Agstar increased yield from 1.20 to 1.92t/ha.
- There was little response to N.
- Agstar was the main driver of yield and profit.
For further information on this trial
contact your local area manager.