Banded soil wetting agents have been typically applied in a continuous stream on top of the furrow following the press wheels to improve the consistency of soil wetting in the furrow and improve crop establishment on water repellent soils. There is some evidence that banding soil wetters near the seed can also be effective at improving establishment. Some recent soil wetters are compatible in formulations with UAN and may improve plant access to nutrients. In 2015 a number of trials were established to assess the impact of these developments on crop establishment and yield for crops growing on repellent soils.
- Assess the effectiveness of wetting agents when banded with the seed compared to banded on the furrow surface.
- Assess the effectiveness of soil wetting agents applied in formulations with UAN.
- Assess the effectiveness of soil wetting agents on water repellent forest gravels.
|Property||Fairbanks, South Kojonup|
|Soil type||Loamy forest gravel|
|Growing season rainfall||April – October: 292mm|
Variety, rate and sowing date
|Treatments||Topsoil (0-5cm) water repellence MED||Topsoil (0-5cm) water repellence rating|
|Hyola 525 RT canola, 2.5kg/ha, 5 May|| |
All wetters banded at 2L/ha
|Bass barley, 110kg/ha,13-14 May|| |
1) Control (nil banding)
|Bass barley 110kg/ha, 13-14 May|| |
1) Control: water banded on furrow or with seed
|Fertiliser, herbicide, or pesticide application||Canola pre-emergent||Canola (experiment 1) post-emergent||Barley (experiments 2 and 3) pre-emergent||Barley (experiments 2 and 3) post-emergent|
|Fertiliser||100kg/ha urea + 120kg/ha Gusto Gold||20L/ha UAN + 50L/ha UAN||65kg/ha Urea + 100kg/ha Gusto Gold |
|50L/ha UAN + 40L/ha UAN |
|Herbicide||1.5L/ha Sprayseed + 1L/ha Propyzamide||900g/ha Roundup Dry + 1.5kg/ha Atrazine + 900g/ha Roundup Dry||1.5L/ha Avadex + 3g/ha Ally + 2L/ha Sprayseed + 2.5L/ha Trifluralin |
|Insecticide||0.5L/ha Chlorpyrifos + 0.2L/ha Bifenthrin||0.1L/ha Transform||1L/ha Chlorpyrifos + 0.3L/ha Bifenthrin||0.5L/ha Chlorpyrifos|