Benefits of topdressing pastures to the rotation (canola)
Trial Location
Darkan
Aim
To determine the long term benefits of topdressing pasture (2001 – 2007) to a following crop (canola).
Soil Analysis results (2001)
| Soil Type |
Depth
(cm)
|
|
(meq/100g)
|
P
(mg/kg) |
PBI
,
|
K
(mg/kg)
|
pH
(CaCl2)
|
| White Gum gravelly loam |
0-10 |
5.5 |
7 |
52 |
150 |
130 |
5.1 |
Plant Analysis results
Phosphorus (P) limiting where not applied. Adequate supply of nitrogen (N), copper (Cu), molybdenum (Mo), and
calcium (Ca).
Harvest results
Trt
|
Pasture 2001 to 2007 (kg/ha) |
P |
2008 |
Yield
(t/ha) |
Oil
(%) |
|
1
|
Nil
|
0
|
Nil
|
0.93
|
45.5
|
|
2
|
100 Muriate of Potash
|
0
|
Nil
|
0.87
|
45.4
|
|
3
|
150 Super Potash 2:1
|
9
|
Nil
|
1.30
|
45.5
|
|
4
|
300 Super Potash 2:1
|
18
|
Nil
|
1.62
|
46.1
|
|
|
|
|
|
Prob
|
<0.001
|
0.506
|
|
|
|
|
LSD
|
0.26
|
nsd
|
Key results
- Topdressing pasture 9kg P/ha/year lifted yield from 0.9t/ha to 1.3-1.5t/ha.
- Topdressing 18kg P/ha/year increased yield to 1.6t/ha.
- There was no response to previously topdressed lime, Potash, gypsum or trace elements.
- Soil tests in 2007 showed that soil phosphorus had fallen to 28ppm (from 52ppm) where topdressing of Super Phos had not occured since 2001.
Related Products
For further information on this trial
contact your local area manager.