Effect of seed rate x herbicides on annual ryegrass management in field peas

Trial In Progress

2022
CC BY 4.0

Research organisatons
Funding source

Trial details

Researcher(s) Ben Fleet
Gurjeet Gill
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 x herbicides on annual ryegrass management in field peas locations
Aims

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

Key messages

Key messages
• Increase in field pea plant density from 40 to 60 plants/m2 by higher seed rate treatments significantly reduced ARG plant and spike density, and increased field pea grain yield. However, the major driver of ARG density and crop yield in this trial was herbicide treatments (P<0.001).
• Large ARG seedbank present at the trial site resulted in continued weed establishment for at least 2 months after sowing, which was reflected in inadequate ARG control by pre-emergent propyzamide alone.
• This trial site has group 1 resistant ARG population, which was reflected in inadequate weed control by the post-emergent clethodim + butroxydim treatment (64% ARG control). The sequential application of pre-emergent herbicide treatments followed by post-emergent herbicides substantially increased ARG control to 86-93%.
• Field pea grain yield increased from 2.19 t/ha at the lowest crop density to 2.65 t/ha at the highest density, a gain of nearly 0.5 t/ha. This improvement in grain yield is likely to be associated with improved weed suppression at the higher seed rates.
• Effective herbicide treatments more than doubled field pea grain yield by reducing competition from ARG. Pre-emergent application of propyzamide followed by post-emergent clethodim + butroxydim was the best treatment with grain yield of 3.1 t/ha as compared to 1.2 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
Acknowledgments

We thank GRDC for providing funding for this project.


Other trial partners Not specified

Method

Crop type Grain Legume: Field peas
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

Loading

Climate

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

Loading
Loading
Loading

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 15:03pm AEST