4.3 Article

Efficacy of pre- and post-emergence herbicide combinations on weed control in no-till mechanically transplanted rice

Journal

COGENT FOOD & AGRICULTURE
Volume 8, Issue 1, Pages -

Publisher

TAYLOR & FRANCIS AS
DOI: 10.1080/23311932.2022.2139794

Keywords

herbicide; no-till or unpuddled; mechanized transplanted rice; weed biomass and density; weed control efficiency

Funding

  1. Australian Centre for International Agricultural Research [CSE/2011/077]
  2. Department of Foreign Affairs and Trade, Australian Government [CSE/2011/077]

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The combination of pre- and post-emergence herbicides in no-till mechanized-transplanted rice fields was found to be effective in controlling complex weed flora and increasing rice grain yield and gross-margin. There was a negative correlation between rice grain yield and weed biomass, and a positive correlation between rice grain yield and weed control efficiency.
No-till mechanized-transplanted rice was evaluated for different combinations of pre- and post-emergence herbicides to determine feasible, economically viable weed management options to control complex weed flora in rice fields. All pre-emergence herbicides significantly reduced the population of grassy weeds; of these, pendimethalin resulted in the greatest reductions (83%) at 15 days after transplanting (DAT). Among five post-emergence herbicide treatments, the combination of bispyribac-sodium (10%SP) + pyrazosulfuron (10%WP) was found to be the most effective in controlling all weed flora at both 35 and 55 DAT. The sequential application of pendimethalin (pre-emergence) followed bispyribac-sodium + pyrazosulfuron (post-emergence) resulted in significantly higher rice grain yield (4.4 t-ha(-1)) and relative gross-margin (417 USD-ha(-1)) than all other treatments. A strong negative correlation was observed between rice grain yield and weed biomass, and a strong positive correlation between rice grain yield and weed control efficiency. Our findings demonstrate the potential to combine pre- and post-emergence herbicides in no-till mechanized-transplanted rice; these findings have applications globally in regions where rice is established by no-till or mechanized transplanting.

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