The effect of single disc seeding operation on herbicide crop tolerance in wheat


Research organisatons
Funding source

Trial details

Researcher(s) Tristan Cornwall, Ken Flower (UoWA) and Mike Ashworth (WANTFA)
Year(s) 2009
Contributor West Midlands Group
Trial location(s) Site 4, Cunderdin, WA
The effect of single disc seeding operation on herbicide crop tolerance in wheat locations

To ascertain the crop safety of pre-emergent (IBS) herbicides when used with differing seeding systems and sowing speeds.

Key messages
  • The disc machine had much less variation in seed placement than the tyne.
  • The depth of incorporation with the single disc seeder increased slightly with speed, although speed of sowing did not significantly improve weed control.
  • Crop growth was not affected by the speed of sowing with discs as hypothesized but there was a significant difference between the tyne and disc seeded treatments. The limited vigour of the wheat seedling sown by the disc seeder is probably the reason for generally lower yields than tyne sown plots. It is not clear whether reduced vigour was due to weed competition or herbicide toxicity as these factors weren’t tested separately in this trial. 
  • For further detials, see attached trial report.
Lead research organisation University of Western Australia
Host research organisation N/A
Trial funding source Caring for our Country
Related program N/A

WANTFA would like to thank the Brett Cox and Alex Fizzioli from the Western Australian College of Agriculture Cunderdin and Kalyx Agriculture staff for assisting with site management.

Other trial partners Not specified
Download the trial report to view additional trial information


Crop type Wheat
Treatment type(s)
  • Herbicide: Type
  • Herbicide: Rate
  • Sowing: Rate
  • Sowing: Method
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Cunderdin 2009

Sow date 3 June 2009
Harvest date Not specified
Plot size 3.5m x 10m
Plot replication 3
Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Treatment 1
Treatment 2
Grain yield (t/ha) Shoot dry weight (g/m2)
1 Nil Tyne 8km/hr 2.06 223
2 Nil Disc 4km/hr 2.07 197
3 Nil Disc 8km/hr 1.95 189
4 Nil Disc 12km/hr 1.64 190
5 Nil Disc 16km/hr 2.02 215
6 Trifluralin 600 0.64L/ha Tyne 8km/hr 2.35 236
7 Trifluralin 600 0.64L/ha Disc 4km/hr 1.69 163
8 Trifluralin 600 0.64L/ha Disc 8km/hr 1.99 210
9 Trifluralin 600 0.64L/ha Disc 12km/hr 1.57 162
10 Trifluralin 600 0.64L/ha Disc 16km/hr 2.16 186
11 Trifluralin 600 1.2L/ha Tyne 8km/hr 2.82 270
12 Trifluralin 600 1.2L/ha Disc 4km/hr 2.51 187
13 Trifluralin 600 1.2L/ha Disc 8km/hr 2.27 172
14 Trifluralin 600 1.2L/ha Disc 12km/hr 2.07 190
15 Trifluralin 600 1.2L/ha Disc 16km/hr 2.17 205
16 Trifluralin 600 3.2L/ha Tyne 8km/hr 3 296
17 Trifluralin 600 3.2L/ha Disc 4km/hr 2.37 173
18 Trifluralin 600 3.2L/ha Disc 8km/hr 2.45 205
19 Trifluralin 600 3.2L/ha Disc 12km/hr 2.22 184
20 Trifluralin 600 3.2L/ha Disc 16km/hr 2.16 191
21 Boxer Gold 2.5L/ha Tyne 8km/hr 2.45 247
22 Boxer Gold 2.5L/ha Disc 4km/hr 2.43 187
23 Boxer Gold 2.5L/ha Disc 8km/hr 2.44 209
24 Boxer Gold 2.5L/ha Disc 12km/hr 2.21 224
25 Boxer Gold 2.5L/ha Disc 16km/hr 2.37 206
26 Pyroxasulfone 118 g/ha Tyne 8km/hr 2.74 229
27 Pyroxasulfone 118 g/ha Disc 4km/hr 2.34 191
28 Pyroxasulfone 118 g/ha Disc 8km/hr 2.66 197
29 Pyroxasulfone 118 g/ha Disc 12km/hr 2.24 211
30 Pyroxasulfone 118 g/ha Disc 16km/hr 2.37 188
31 Pyroxasulfone 235 g/ha Tyne 8km/hr 2.65 245
32 Pyroxasulfone 235 g/ha Disc 4km/hr 2.65 189
33 Pyroxasulfone 235 g/ha Disc 8km/hr 2.68 179
34 Pyroxasulfone 235 g/ha Disc 12km/hr 2.48 150
35 Pyroxasulfone 235 g/ha Disc 16km/hr 2.74 195

Grain yield t/ha


Shoot dry weight g/m2

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 4, Cunderdin, WA Deep sand over clay sand
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 4, Cunderdin, WA Sodosol
National soil grid Source
NOTE: National Soil Grid data is aggregated information for background information on the wider area
Actual soil values can vary significantly in a small area and the trial soil tests are the most relevant data where available

Soil properties



Site 4, Cunderdin WA 2009

Observed climate information

Rainfall trial gsr (mm) 237mm

Derived climate information

Site 4, Cunderdin WA


Some data on this site is sourced from the Bureau of Meteorology

SILO weather estimates sourced from
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol 16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.

Individual Trial Project data and information and OFT metadata are licensed under a Creative Commons Attribution 4.0 International License.
The data and information accessed through OFT may also be subject to Terms of Use specified by the Trial Contributor,
in which case the Terms of Use of a Trial Contributor take precedence over other information provided on OFT.
Trial last modified: 27-06-2019 13:22pm AEST