Nitrogen and potassium responses in wheat versus barley
Aim
Nitrogen (N) and Potassium (K) responses in wheat and barley.
Soil Analysis results
|
Soil Type
|
Depth
|
OC
|
ECEC
|
Nit N
|
Amm N
|
P
|
PBI
|
S
|
pH
|
|
Loamy sand
|
0-10
|
1.4
|
5.6
|
12
|
1
|
43
|
17
|
55
|
5.1
|
|
|
20-30cm
|
1.6
|
6.4
|
1
|
1
|
11
|
|
10
|
5.2
|
Plant Analysis results
K was marginal where not applied. Trace elements were adequate.
Harvest results
|
|
|
Treatment
|
|
|
|
|
Wheat
|
Barley
|
|
|
IBS
|
Banded
|
Z14
|
Z30
|
|
|
Yield
|
Protein
|
Yield
|
Protein
|
|
|
(kg/ha)
|
(l/ha)
|
(kg/ha)
|
(l/ha)
|
(l/ha)
|
N
|
K
|
(t/ha)
|
(%)
|
(t/ha)
|
(%)
|
|
1
|
-
|
-
|
120 Agstar
|
-
|
-
|
12
|
0
|
2.41
|
12.0
|
4.50
|
8.9
|
|
2
|
-
|
38 Flexi-N
|
120 Agstar
|
50 Flexi-N
|
-
|
54
|
0
|
3.08
|
12.7
|
4.46
|
10.1
|
|
3
|
-
|
38 Flexi-N
|
120 Agstar
|
50 Flexi-N
|
100 Flexi-N
|
96
|
0
|
2.82
|
12.4
|
4.12
|
11.5
|
|
4
|
-
|
50 Flexi-N
|
120 K-Till Plus
|
50 Flexi-N
|
100 Flexi-N
|
96
|
12
|
3.31
|
13.8
|
4.18
|
10.8
|
|
5
|
100 Muriate of Potash
|
-
|
120 K-Till Plus
|
-
|
-
|
12
|
61
|
2.82
|
12.4
|
4.37
|
9.2
|
|
6
|
100 Muriate of Potash
|
50 Flexi-N
|
120 K-Till Plus
|
50 Flexi-N
|
-
|
54
|
61
|
3.25
|
12.5
|
4.56
|
10.0
|
|
7
|
100 Muriate of Potash
|
50 Flexi-N
|
120 K-Till Plus
|
50 Flexi-N
|
100 Flexi-N
|
96
|
61
|
3.27
|
13.5
|
3.97
|
10.7
|
|
|
|
|
|
|
|
Prob
|
0.002
|
0.4
|
0.524
|
0.046
|
|
|
|
|
|
|
|
LSD
|
0.37
|
nsd
|
nsd
|
1.6
|
Key results
- Barley yields averaged 1.3t/ha more than wheat
- K-Till Plus increased wheat yield by 0.5t/ha
- Flexi-N increased wheat yield by 0.4 to 0.6t/ha
- Barley did not respond to N or K.
For further information on this trial
contact your local area manager.