Abstract
Field experiments were conducted in 1992 and 1993 to determine the timing and amount of rainfall required to activate UCC-C4243 applied preemergence. UCC-C4243 at 0, 70, and 140 g ai ha −1 was applied 1, 7, 14, and 21 d before 0.5 or 2 cm of simulated rainfall. Temporary rainshelters protected field plots from natural rainfall during the 21 d dry period. Herbicide activity was determined in the field by seeding lentil, wheat, common lambsquarters, and field pennycress and in the greenhouse by a sugarbeet bioassay of soil samples (0 to 3 cm depth) taken from all plots immediately before irrigation. UCC-C4243 did not injure wheat; however, lentil population was reduced when simulated rainfall occurred within 7 d after application. Lentil injury was greater with higher herbicide rate and higher water level. UCC-C4243 at 70 and 140 g ha −1 reduced populations of both weed species by 75 and 90%, respectively, when either 0.5 or 2 cm simulated rainfall was received within 1 d after herbicide application. Weed control was reduced with a 21 d delay between herbicide application and water activation. The sugarbeet bioassay showed a linear decrease of herbicide activity over time and also with accumulated photosynthetically active radiation. After 17.9 d, herbicide activity on a dry soil surface decreased 50%. Laboratory investigations show that [ 14 C]-UCC-C4243 on glass slides was photodegraded by near ultraviolet light (290 to 400 nm). Volatilization of 14 C-labeled herbicide from glass slides was less than 5% after exposure to turbulent air for 48 h.
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Claims 10
Claim · model-written summary
UCC-C4243 did not injure wheat.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- UCC-C4243e0
- Outcome
- injure wheate0
- Direction
- did note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UCC-C4243 did not injure wheat”
Claim · model-written summary
Lentil population fell when rainfall occurred within 7 days of herbicide application.
- Taxon
- lentil
Lens culinarise0 - Treatment
- simulated rainfall occurred within 7 d after applicatione0
- Outcome
- lentil populatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lentil population was reduced when simulated rainfall occurred within 7 d after application”
e1“UCC-C4243 did not injure wheat; however, lentil population was reduced”
Claim · model-written summary
Lentil injury grew with higher herbicide rate.
- Taxon
- LentilLens culinarise0
- Treatment
- higher herbicide ratee0
- Outcome
- Lentil injurye0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lentil injury was greater with higher herbicide rate and higher water level”
Claim · model-written summary
Lentil injury grew with higher water level.
- Taxon
- LentilLens culinarise0
- Treatment
- higher water levele0
- Outcome
- Lentil injurye0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lentil injury was greater with higher herbicide rate and higher water level”
Claim · model-written summary
At 70 g ha −1, UCC-C4243 reduced weed populations by 75% after prompt rainfall.
- Taxon
- common lambsquarters
Chenopodium albume1 - Treatment
- UCC-C4243 at 70 and 140 g ha −1e0
- Interactor
- field pennycress
_-_Guelph%2C_Ontario_2020-04-12.jpg?width=60)
Thlaspi arvensee1weed - Outcome
- populations of both weed speciese0
- Direction
- reducede0
- Value
- 75e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_-_Guelph%2C_Ontario_2020-04-12.jpg?width=500)
Verbatim
e0“UCC-C4243 at 70 and 140 g ha −1 reduced populations of both weed species by 75 and 90%, respectively, when either 0.5 or 2 cm simulated rainfall was received within 1 d after herbicide application”
e1“common lambsquarters, and field pennycress”
Claim · model-written summary
At 140 g ha −1, UCC-C4243 reduced weed populations by 90% after prompt rainfall.
- Taxon
- common lambsquartersChenopodium albume1
- Treatment
- UCC-C4243 at 70 and 140 g ha −1e0
- Interactor
- field pennycressThlaspi arvensee1weed
- Outcome
- populations of both weed speciese0
- Direction
- reducede0
- Value
- 90%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UCC-C4243 at 70 and 140 g ha −1 reduced populations of both weed species by 75 and 90%, respectively, when either 0.5 or 2 cm simulated rainfall was received within 1 d after herbicide application”
e1“common lambsquarters, and field pennycress”
Claim · model-written summary
Delaying water activation 21 days reduced weed control.
- Taxon
- lentilLens culinarise1
- Treatment
- 21 d delay between herbicide application and water activatione0
- Outcome
- Weed controle0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Weed control was reduced with a 21 d delay between herbicide application and water activation”
e1“seeding lentil, wheat, common lambsquarters, and field pennycress”
Claim · model-written summary
The sugarbeet bioassay showed herbicide activity decreasing over time.
- Taxon
- sugarbeet
Beta vulgaris subsp. vulgarise0 - Outcome
- herbicide activitye0
- Direction
- linear decreasee0
- Comparator
- over timee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sugarbeet bioassay showed a linear decrease of herbicide activity over time”
e1“a sugarbeet bioassay of soil samples”
Claim · model-written summary
The sugarbeet bioassay showed herbicide activity decreasing with accumulated photosynthetically active radiation.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarise0
- Outcome
- herbicide activitye0
- Direction
- linear decreasee0
- Comparator
- accumulated photosynthetically active radiatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sugarbeet bioassay showed a linear decrease of herbicide activity over time and also with accumulated photosynthetically active radiation”
Claim · model-written summary
Herbicide activity on dry soil decreased 50% after 17.9 days.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarise1
- Outcome
- herbicide activity on a dry soil surfacee0
- Direction
- decreasede0
- Value
- 50%e0
- Qualifier
- After 17.9 de0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 17.9 d, herbicide activity on a dry soil surface decreased 50%”
e1“a sugarbeet bioassay of soil samples”
The same questions in other papers
herbicide · weed · Lens culinaris (lentil)Positive and negative results
23 in the opposite direction
- positive
- positive
- positive
20 papers more in this group
See all 24 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.