Time of Sowing and Ryegrass Management


Research organisatons
Funding source

Trial details

Researcher(s) Blake Gontar (SARDI), Andrew Ware (SARDI)
Year(s) 2014
Contributor Lower Eyre Agricultural Development Association
Trial location(s) Site 3, Yeelanna, SA
Time of Sowing and Ryegrass Management locations

To investigate proactive non-herbicide management strategies for reducing ryegrass seed set and so 'run down' the seed bank.

Key messages

- Early sowing of barley may be an effective way of controlling ryegrass growth and limiting seed set - Results in wheat are more variable than for barley: at Wanilla, mid-May seemed the optimal time of sowing to reduce ryegrass with less effect obvious at Yeelanna - Higher seeding rates also followed the same trend, with little ryegrass suppression benefit seen in wheat but a benefit evident in barley - Increasing seeding rate did not improve wheat yields significantly however barley (Fleet) did seem to benefit from higher seeding rates when sown late (mid-June)

Lead research organisation Grains Research and Development Corporation
Host research organisation N/A
Trial funding source GRDC LEA00002
Related program Maintaining profitable farming systems with retained stubble

Thankyou to the Puckridge family for hosting the site

Other trial partners SARDI
Download the trial report to view additional trial information


Crop type Other: Multiple
Treatment type(s)
  • Crop: Type
  • Sowing: Rate
  • Sowing: Timing
  • Variety: Type
Trial type Experimental
Trial design Replicated
Sow rate or Target density 150 and 250 plants/m2
Sowing machinery Not specified
Sow date 5 May 2014
Sow date 5 May, 16 May and 11 June 2014
Harvest date 27 November 2014
Plot size 68m x 48m
Plot replication 3
Plot blocking Not specified
Plot randomisation Not specified
Paddock history 2010 wheat, 2011 wheat, 2012, canola, 2013 lentils

100kg/ha 18:20 N:P


Glyphosate and Sakura per normal farmer practice

Insecticide Not specified

400mL/ha Impact

Pesticide Not specified
Soil amelioration Not specified
Seed treatment Not specified
Inoculant Not specified
Tillage Not specified
Other trial notes Not specified
Download the trial report to view additional method/treatment information

Trial results Table 1

# Variety
Treatment 1
Treatment 2
Treatment 3
Grain yield (t/ha) Ryegrass density (plants/m2)
1 Fleet Barley 150/m2 5 May 3.07 2.5
2 Fleet Barley 150/m2 16 May 3.44 27.5
3 Fleet Barley 150/m2 11 June 1.53 215
4 Fleet Barley 250/m2 5 May 3.37 3.33
5 Fleet Barley 250/m2 16 May 3.62 2.5
6 Fleet Barley 250/m2 11 June 2.43 60.83
7 Mace Wheat 150/m2 5 May 3.18 19.17
8 Mace Wheat 150/m2 16 May 2.86 44.17
9 Mace Wheat 150/m2 11 June 1.68 35
10 Mace Wheat 250/m2 5 May 3.08 30
11 Mace Wheat 250/m2 16 May 2.83 45.83
12 Mace Wheat 250/m2 11 June 2.45 5.83
13 Emu Rock Wheat 150/m2 5 May 3.15 13.33
14 Emu Rock Wheat 150/m2 16 May 2.8 59.17
15 Emu Rock Wheat 150/m2 11 June 1.66 88.33
16 Emu Rock Wheat 250/m2 5 May 3.12 25.83
17 Emu Rock Wheat 250/m2 16 May 2.81 60
18 Emu Rock Wheat 250/m2 11 June 2.13 0.83
19 Wyalkatchem Wheat 150/m2 5 May 3.2 20.83
20 Wyalkatchem Wheat 150/m2 16 May 3.02 20
21 Wyalkatchem Wheat 150/m2 11 June 2.28 25
22 Wyalkatchem Wheat 250/m2 5 May 3.41 16.67
23 Wyalkatchem Wheat 250/m2 16 May 2.64 14.17
24 Wyalkatchem Wheat 250/m2 11 June 2 5
LSD 0.96

Grain yield t/ha


Ryegrass density plants/m2

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 3, Yeelanna, SA Sand over clay
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 3, Yeelanna, SA 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 3, Yeelanna SA 2014

Observed climate information
Rainfall trial gsr (mm) 398.8mm
Derived climate information
BOM Data source WANILLA [4218] 6km proximity to trial site location


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

SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
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.

Trial report and links

2014 trial report