Abstract
ABSTRACT Measuring shikimic acid accumulation in response to glyphosate applications can be a rapid and accurate way to quantify and predict glyphosate‐induced damage to sensitive plants. The objective of this paper was to evaluate the effect of cover crop termination timing by glyphosate application on rice ( Oryza sativa L.) yield in a no‐till system. A factorial experiment, arranged in a split‐plot design, was conducted for 2 yr. Treatments consisted of cover crops (main plots) and timed herbicide applications (subplots) to these cover crops (30, 20, 10, and 0 d before rice planting). There was a decrease in rice yield from 2866 kg ha −1 to 2322 kg ha −1 when the herbicide was applied closer to the rice planting day. Glyphosate application on cover crops increased shikimate concentrations in rice seedlings cultivated under palisade grass ( Brachiaria brizantha ), signal grass ( B. ruziziensis ), guinea grass ( Panicum maximum ), and weedy fallow (spontaneous vegetation) but not under millet ( Pennisetum glaucum ), which behaved similarly to the control (clean fallow, no glyphosate application). Glyphosate applications in the timing intervals used were associated with stress in the rice plants, and this association increased if cover crops took longer to completely dry and if higher amounts of biomass were produced. Millet, as a cover crop, allowed the highest seedling dry matter for upland rice and the highest rice yield. Our results suggest that using millet as a cover crop, with glyphosate application far from upland rice planting day (10 d or more), was the best option for upland rice under a no‐tillage system.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
Glyphosate application closer to rice planting decreased rice yield from 2866 to 2322 kg ha −1.
- Taxon
- rice
Oryza sativae0 - Treatment
- herbicidee0
- Outcome
- rice yielde0
- Direction
- decreasee0
- Value
- 2322 kg ha −1e0
- Qualifier
- 2866 kg ha −1e0
- Comparator
- rice planting daye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a decrease in rice yield from 2866 kg ha −1 to 2322 kg ha −1 when the herbicide was applied closer to the rice planting day.”
Claim · model-written summary
Glyphosate application increased rice seedling shikimate under palisade grass ( Brachiaria brizantha ).
- Taxon
- riceOryza sativae0
- Treatment
- Glyphosate applicatione0
- Outcome
- shikimate concentrationse0
- Direction
- increasede0
- Qualifier
- palisade grass ( Brachiaria brizantha )e0
- Comparator
- control (clean fallow, no glyphosate application)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate application on cover crops increased shikimate concentrations in rice seedlings cultivated under palisade grass ( Brachiaria brizantha ), signal grass ( B. ruziziensis ), guinea grass ( Panicum maximum ), and weedy fallow (spontaneous vegetation) but not under millet ( Pennisetum glaucum ), which behaved similarly to the control (clean fallow, no glyphosate application).”
Claim · model-written summary
Glyphosate application increased rice seedling shikimate under signal grass ( B. ruziziensis ).
- Taxon
- riceOryza sativae0
- Treatment
- Glyphosate applicatione0
- Outcome
- shikimate concentrationse0
- Direction
- increasede0
- Qualifier
- signal grass ( B. ruziziensis )e0
- Comparator
- control (clean fallow, no glyphosate application)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate application on cover crops increased shikimate concentrations in rice seedlings cultivated under palisade grass ( Brachiaria brizantha ), signal grass ( B. ruziziensis ), guinea grass ( Panicum maximum ), and weedy fallow (spontaneous vegetation) but not under millet ( Pennisetum glaucum ), which behaved similarly to the control (clean fallow, no glyphosate application).”
Claim · model-written summary
Glyphosate application increased rice seedling shikimate under guinea grass ( Panicum maximum ).
- Taxon
- riceOryza sativae0
- Treatment
- Glyphosate applicatione0
- Outcome
- shikimate concentrationse0
- Direction
- increasede0
- Qualifier
- guinea grass ( Panicum maximum )e0
- Comparator
- control (clean fallow, no glyphosate application)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate application on cover crops increased shikimate concentrations in rice seedlings cultivated under palisade grass ( Brachiaria brizantha ), signal grass ( B. ruziziensis ), guinea grass ( Panicum maximum ), and weedy fallow (spontaneous vegetation) but not under millet ( Pennisetum glaucum ), which behaved similarly to the control (clean fallow, no glyphosate application).”
Claim · model-written summary
Glyphosate application increased rice seedling shikimate under weedy fallow (spontaneous vegetation).
- Taxon
- riceOryza sativae0
- Treatment
- Glyphosate applicatione0
- Outcome
- shikimate concentrationse0
- Direction
- increasede0
- Qualifier
- weedy fallow (spontaneous vegetation)e0
- Comparator
- control (clean fallow, no glyphosate application)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate application on cover crops increased shikimate concentrations in rice seedlings cultivated under palisade grass ( Brachiaria brizantha ), signal grass ( B. ruziziensis ), guinea grass ( Panicum maximum ), and weedy fallow (spontaneous vegetation) but not under millet ( Pennisetum glaucum ), which behaved similarly to the control (clean fallow, no glyphosate application).”
Claim · model-written summary
Rice seedlings under millet showed no glyphosate associated shikimate increase relative to clean fallow.
- Taxon
- riceOryza sativae0
- Treatment
- millet ( Pennisetum glaucum )e0
- Outcome
- shikimate concentrationse0
- Direction
- similarlye0
- Comparator
- control (clean fallow, no glyphosate application)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate application on cover crops increased shikimate concentrations in rice seedlings cultivated under palisade grass ( Brachiaria brizantha ), signal grass ( B. ruziziensis ), guinea grass ( Panicum maximum ), and weedy fallow (spontaneous vegetation) but not under millet ( Pennisetum glaucum ), which behaved similarly to the control (clean fallow, no glyphosate application).”
Claim · model-written summary
Glyphosate timing was associated with stress in rice, stronger when cover crops dried slowly and produced more biomass.
- Taxon
- riceOryza sativae0
- Treatment
- Glyphosate applicationse0
- Outcome
- stresse0
- Direction
- increasede0
- Qualifier
- cover crops took longer to completely dry and if higher amounts of biomass were producede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate applications in the timing intervals used were associated with stress in the rice plants, and this association increased if cover crops took longer to completely dry and if higher amounts of biomass were produced.”
Claim · model-written summary
Millet cover cropping gave the highest rice seedling dry matter.
- Taxon
- riceOryza sativae0
- Treatment
- Millete0
- Outcome
- seedling dry mattere0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Millet, as a cover crop, allowed the highest seedling dry matter for upland rice and the highest rice yield.”
Claim · model-written summary
Millet cover cropping gave the highest rice yield.
- Taxon
- riceOryza sativae0
- Treatment
- Millete0
- Outcome
- rice yielde0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Millet, as a cover crop, allowed the highest seedling dry matter for upland rice and the highest rice yield.”
Claim · model-written summary
The authors recommend millet cover cropping with glyphosate at least 10 days before upland rice planting.
- Taxon
- riceOryza sativae0
- Outcome
- using millet as a cover crop, with glyphosate application far from upland rice planting day (10 d or more)e0
- Setting
- no‐tillage systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results suggest that using millet as a cover crop, with glyphosate application far from upland rice planting day (10 d or more), was the best option for upland rice under a no‐tillage system.”
The same questions in other papers
glyphosate · molecular: metabolites · Oryza sativa (rice)Results agree
3 papers in the same direction as this paper
- negative
- no effect
- negative
herbicide · yield · Oryza sativa (rice)Positive and negative results
76 papers in the same direction as this paper · 725 in the opposite direction
- positive
- positive
- positive
798 papers more in this group
See all 802 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.