Effect of combinations of sowing time, seed rate and herbicides on ryegrass management in faba beans

2021
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 +61428592825
Year(s) 2021
Contributor School of Agriculture, Food and Wine - The University of Adelaide
Trial location(s) Washpool, SA
Effect of combinations of sowing time, seed rate and herbicides on ryegrass management in faba beans locations
Aims

The aim of the trial was to investigate factorial combinations of sowing time, seed rate and herbicides on the management of annual ryegrass in faba beans.

Key messages
  • Propyzamide provided stable and effective ryegrass control at both sowing times. In contrast, simazine + Trifluralin by itself or followed by clethodim was more effective in TOS 2 than in TOS 1. It is possible superior soil moisture conditions at sowing in TOS 2 may have improved weed control in these treatments.
  • Increased crop ground cover from higher faba bean seed rates reduced ryegrass growth and spike density. An increase in faba bean seed rate from 20 to 40 seeds/m2 reduced ryegrass spike density from 35 to 21 spikes/m2 (41%).
  • The combination of propyzamide followed by Factor + Clethodim was able to almost eliminate ryegrass spike production (0.1 spikes/m2). Previous studies have also shown improvement in ryegrass control when Factor (butroxydim) is added to clethodim when treating clethodim resistant populations.
  • Faba beans sown on 26 May produced significantly greater grain yield than the crop sown on 22 June. This is consistent with general grower experience of superior performance of faba beans when sown early.
  • As ryegrass density at the trial site was low (<35 plants/m2), grain yield of faba beans in herbicide treatments ranged from 2.48 to 2.65 t/ha and was unaffected by herbicide treatments (P=0.309). These results suggest faba beans can tolerate low ryegrass densities without suffering any loss in grain yield. However, failure to effectively control low ryegrass densities can lead to large build-up in ryegrass seedbank for subsequent crops.
Lead research organisation School of Agriculture, Food and Wine - The University of Adelaide
Host research organisation Hart Field Site Group
Trial funding source GRDC 9175134
Related program GRDC - Weeds
Acknowledgments

GRDC for providing funds for this research and a local grower for hosting the trial.


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

Method

Crop types Grain Legume: Faba beans Weed: Ryegrass
Treatment type(s)
  • Herbicide: Type
  • Sowing: Rate
  • Sowing: Timing
Trial type Experimental
Trial design Randomised,Replicated

Washpool 2021 Faba beans

Sow date 26 May and 22 June
Harvest date Not applicable
Plot size Not specified
Plot replication Not specified
Psuedoreplication Not specified

Washpool 2021 Ryegrass

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Psuedoreplication Not specified
Download the trial report to view additional method/treatment information
Trial source data and summary not available
Check the trial report PDF for trial results.
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Washpool, SA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Washpool, 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

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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.

Washpool SA

NOTE: Exact trial site locality unknown - Climate data may not be accurate
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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

2021 trial report



Trial last modified: 20-03-2023 16:37pm AEST