Abstract
Greenhouse and field studies were conducted to determine the influence of herbicide rate, hybrid variability, and soil moisture on the effectiveness of CGA-154281 in protecting corn seedlings from metolachlor injury. High rates of metolachlor caused significant injury to seedlings of sensitive corn hybrids. However, with metolachlor plus CGA-154281, very few injury symptoms were observed, even with the 7.8 kg ha –1 rate and the most sensitive hybrid. Corn seedlings were not injured by metolachlor plus CGA-154281 at the highest soil moisture level evaluated, whereas those treated with metolachlor alone showed 70% injury. Metolachlor injury increased as soil moisture content increased. In the greenhouse, CGA-154281 did not protect any of the eight weed species tested against injury by 2.2 kg ha –1 metolachlor. In laboratory studies, CGA-154281 did not alter the absorption of 14 C-metolachlor during an 8-h period. Qualitative comparison of the metabolism of metolachlor in the presence or absence of the protectant indicated that metolachlor was metabolized to a more polar metabolite, believed to be a glutathione conjugate. However, CGA-154281 significantly enhanced the rate of metabolism of metolachlor in three of the four hybrids tested. Metolachlor metabolism activity may already have been functioning at a maximum level in the unaffected hybrid.
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Claims 8
Claim · model-written summary
High metolachlor rates significantly injured sensitive corn seedlings.
- Taxon
- corn
Zea mays subsp. mayse0 - Organ / stage
- seedlingse0
- Treatment
- High rates of metolachlore0
- Outcome
- injurye0
- Direction
- causede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High rates of metolachlor caused significant injury to seedlings of sensitive corn hybrids.”
Claim · model-written summary
Metolachlor plus CGA-154281 yielded very few injury symptoms even at 7.8 kg ha –1 in the most sensitive hybrid.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- metolachlor plus CGA-154281e0
- Outcome
- injury symptomse0
- Direction
- very fewe0
- Value
- 7.8 kg ha –1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with metolachlor plus CGA-154281, very few injury symptoms were observed, even with the 7.8 kg ha –1 rate and the most sensitive hybrid.”
t0“Corn (Zea mays)”
Claim · model-written summary
At the highest soil moisture, metolachlor plus CGA-154281 did not injure corn seedlings, whereas metolachlor alone caused 70% injury.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- metolachlor plus CGA-154281e0
- Outcome
- injurede0
- Direction
- not injurede0
- Value
- 70%e0
- Qualifier
- highest soil moisture levele0
- Comparator
- metolachlor alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn seedlings were not injured by metolachlor plus CGA-154281 at the highest soil moisture level evaluated, whereas those treated with metolachlor alone showed 70% injury.”
Claim · model-written summary
Metolachlor injury increased with soil moisture content.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- soil moisture contente0
- Outcome
- Metolachlor injurye0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Metolachlor injury increased as soil moisture content increased.”
t0“Corn (Zea mays)”
Claim · model-written summary
CGA-154281 did not protect eight weed species from metolachlor injury.
- Treatment
- CGA-154281e0
- Outcome
- injurye0
- Direction
- did not protecte0
- Value
- 2.2 kg ha –1e0
- Qualifier
- eight weed speciese0
Not reportedTaxonComparator
Verbatim
e0“CGA-154281 did not protect any of the eight weed species tested against injury by 2.2 kg ha –1 metolachlor.”
Claim · model-written summary
CGA-154281 did not alter 14 C-metolachlor absorption over 8 h.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- CGA-154281e0
- Outcome
- absorption of 14 C-metolachlore0
- Direction
- did not altere0
- Qualifier
- 8-h periode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CGA-154281 did not alter the absorption of 14 C-metolachlor during an 8-h period.”
t0“Corn (Zea mays)”
Claim · model-written summary
Metolachlor was metabolized to a more polar metabolite believed to be a glutathione conjugate.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- more polar metabolitee0
- Qualifier
- believed to be a glutathione conjugatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“metolachlor was metabolized to a more polar metabolite, believed to be a glutathione conjugate.”
t0“Corn (Zea mays)”
Claim · model-written summary
CGA-154281 significantly enhanced metolachlor metabolism in three of four hybrids.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- CGA-154281e0
- Outcome
- rate of metabolism of metolachlore0
- Direction
- enhancede0
- Value
- three of the four hybridse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CGA-154281 significantly enhanced the rate of metabolism of metolachlor in three of the four hybrids tested.”
t0“Corn (Zea mays)”
The same questions in other papers
metolachlor · crop injury · Zea mays (maize)Positive and negative results
1 paper in the same direction as this paper · 5 in the opposite direction
- negative
- negative
- negative
3 papers more in this group
See all 7 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.