Abstract
Rice varieties from the Clearfield® system may present different tolerance levels to imidazolinone herbicides in function of application rate. The objective of this research was to evaluate the phytotoxicity of different rates of the formulated mixture of the herbicides imazapyr+imazapic applied on two tolerant irrigated rice varieties. The experiment was carried out in 2015/16 and 2016/17 growing seasons. A randomized complete block design was used in a factorial 2x6 with five replications. The factor A was composed by the tolerant rice varieties Guri INTA CL and IRGA 424 RI, and the factor B by rates of the formulated mixture of the herbicides imazapyr+imazapic (525+175 g a.i. kg-1) of 0, 140, 210, 280, 350, and 420 g c.p. ha-1. In the first growing season, it was observed maximum phytotoxicity of 8.5% while in the second the highest percentage was 13%. The number of stems m-2, plant height, shoot dry matter, SPAD index, and grain yield were not influenced (p≥0.05) by herbicide rates. The application of the formulated mixture of the herbicides imazapyr+imazapic causes low initial phytotoxicity to the tolerant rice varieties Guri INTA CL and IRGA 424 RI up to three times the recommended rate, not influencing their grain yield.
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Claims 5
Claim · model-written summary
Maximum rice phytotoxicity was 8.5% in the first growing season.
- Taxon
- rice
Oryza sativat0 - Outcome
- phytotoxicitye0
- Direction
- maximume0
- Value
- 8.5%e0
- Qualifier
- first growing seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the first growing season, it was observed maximum phytotoxicity of 8.5%”
t0“tolerant rice varieties Guri INTA CL and IRGA 424 RI”
Claim · model-written summary
Maximum rice phytotoxicity was 13% in the second growing season.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while in the second the highest percentage was 13%.”
t0“Phytotoxicity of imazapyr+imazapic on tolerant rice varieties Guri INTA CL and IRGA 424 RI”
Claim · model-written summary
Herbicide rates did not significantly influence rice stem number, height or shoot dry matter.
- Taxon
- riceOryza sativat0
- Treatment
- herbicide ratese0
- Outcome
- number of stems m-2, plant height, shoot dry mattere0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of stems m-2, plant height, shoot dry matter, SPAD index, and grain yield were not influenced (p≥0.05) by herbicide rates.”
t0“rice varieties”
Claim · model-written summary
Herbicide rates did not significantly influence rice SPAD index or grain yield.
- Taxon
- riceOryza sativat0
- Treatment
- herbicide ratese0
- Outcome
- SPAD index, and grain yielde0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of stems m-2, plant height, shoot dry matter, SPAD index, and grain yield were not influenced (p≥0.05) by herbicide rates.”
t0“rice varieties”
Claim · model-written summary
The herbicide mixture caused low initial phytotoxicity in tolerant rice varieties up to three times the recommended rate.
- Taxon
- riceOryza sativae0
- Material
- Guri INTA CLe0
- Treatment
- formulated mixture of the herbicides imazapyr+imazapice0
- Outcome
- phytotoxicitye0
- Direction
- lowe0
- Qualifier
- up to three times the recommended ratee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of the formulated mixture of the herbicides imazapyr+imazapic causes low initial phytotoxicity to the tolerant rice varieties Guri INTA CL and IRGA 424 RI up to three times the recommended rate”
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