Farm Table says:
The take home messages from this GRDC funded research are below. Please access the full paper via the link below for methodology, references, acknowledgements and discussion.
- Feathertop Rhodes grass (FTR) and awnless barnyard grass (ABG) are both difficult to control summer grass weeds with both species prone to herbicide resistance evolution
- Growing a competitive sorghum or mungbean crop can reduce growth and seed production of FTR and ABG
- ABG is more susceptible to the impacts of crop competition than FTR
- Sorghum competitiveness can be increased by growing the crop at a narrow row spacing (50 cm) and increased density (10 to 15 plants/m2)
- Mungbean competitiveness is most effectively increased through the use of narrow row spacing (25 and 50 cm)
- Consider growing a competitive summer crop to take pressure off relying solely on in-crop herbicides for summer grass control.
Figure 4. Effect of sorghum row spacing and crop density on awnless barnyard grass biomass. Narrabri, NSW 2017/18. Data points with a different letter are significantly different (P=0.05). LSD = 24.7.