Effect of seed rate and herbicides on annual ryegrass management in lentils (Roseworthy, SA)

Trial In Progress

CC BY 4.0

Research organisatons
Funding source

Trial details

Researcher(s) N/A
Contact email gurjeet.gill@adelaide.edu.au
Contact phone 0428 592825
Year(s) 2022
Contributor School of Agriculture, Food and Wine - The University of Adelaide
Trial location(s) Roseworthy campus, University of Adelaide, SA
Effect of seed rate and herbicides on annual ryegrass management in lentils (Roseworthy, SA) locations

This field trial at Roseworthy was undertaken to investigate factorial combinations of lentil seed rate and herbicides on the management of annual ryegrass.

Key messages

Key messages
• Lentil seed rate had a significant effect on crop density (P<0.001), which was within 10% of the target density range of 80 to 160 plants/m2.
• ARG plant density was significantly affected only by the herbicide treatments (P<0.001). Good soil moisture at crop sowing in 2022 were ideal for the activity of pre-emergent herbicide propyzamide, which reduced ARG plant density by 79% compared to the untreated control.
• The trial site has group 1 resistant ARG population, which was reflected in large ARG plant survival when sprayed with the post-emergent clethodim + butroxydim herbicide treatment (79% ARG control). However, the sequential application of pre-emergent propyzamide followed by the post-emergent herbicides substantially increased ARG control to 88%.
• Consistent with the results for ARG plant density, herbicide treatments caused a significant (P<0.001) reduction in its spike density. The combination of pre-emergent herbicides followed by the post-emergent treatments reduced ARG spike density by 86 to 91%. These trends are likely to be also reflected in ARG seed set, which tends to be highly correlated with spike density.
• As lentils are a weak competitor against weeds, herbicide treatments had a highly significant impact on crop yield (P<0.001). Use of pre-emergent propyzamide alone more than doubled lentil grain yield. Pre-emergent application of propyzamide followed by post-emergent clethodim + butroxdim was the best treatment with grain yield of 4.369 t/ha as compared to 1.303 t/ha in the untreated control.

Lead research organisation School of Agriculture, Food and Wine - The University of Adelaide
Host research organisation The University of Adelaide
Trial funding source GRDC 9175134
Related program GRDC - Weeds

We thank GRDC for providing funding for this research project.

Other trial partners Not specified


Crop type Grain Legume: Lentils
Treatment type(s)
  • Herbicide: Type
  • Sowing: Rate
Trial type Experimental
Trial design Randomised,Replicated

Roseworthy campus, University of Adelaide 2022

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Roseworthy campus, University of Adelaide, SA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Roseworthy campus, University of Adelaide, SA Chromosol
National soil grid Source: CSIRO/TERN
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



Derived climate information

No observed climate data available for this trial.
Derived climate data is determined from trial site location and national weather sources.

Roseworthy campus, University of Adelaide SA


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 last modified: 29-03-2023 13:18pm AEST