Abstract
The herbicide tembotrione is effective against grassy weeds constituting an important tool in sorghum crops. However, in Brazil, this herbicide is only registered for corn. This study aimed to evaluate the selectiveness of tembotrione combined with atrazine at different doses and developmental stages of grain sorghum. Two experiments were conducted in Rio Verde and Montividiu, state of Goiás, Brazil, in 2018. A randomized block design with four replications, in a 3x2+1+1 factorial arrangement, tested three developmental stages (V3, V5 and V7), two doses of tembotrione (37.8 and 75.6 g ha-1) combined with the herbicide atrazine (1,000 g ha-1), an additional treatment only with atrazine at V3 and a control, free of herbicide. Evident phytotoxicity was observed with the combination of tembotrione and atrazine at V3 and V5 stages. Symptoms included reductions in plant height, sorghum stem diameter, panicle length, and cumulative dry mass of sorghum plant shoots. However, there was no influence on thousand grains mass, regardless of application stages. Tembotrione at 37.8 g ha-1 combined with atrazine at 1,000 g ha-1 was selective for grain sorghum when applied at V7, without affecting grain yield. Highlights: Phytotoxicity symptoms of tembotrione and atrazine are more noticeable at V3 stage, beyond reducing the plant height and stem diameter. Application of tembotrione and atrazine at V3 and V5 stages reduces the accumulation of shoot dry mass. Spraying of tembotrione (37.8 g ha-1) and atrazine in V7 stage is not reduce the yield of BRS 330 grain sorghum hybrid.
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Claims 6
Claim · model-written summary
Tembotrione plus atrazine caused evident sorghum phytotoxicity at V3 and V5.
- Taxon
- grain sorghum
Sorghum bicolort0 - Organ / stage
- V3 and V5 stagese0
- Treatment
- combination of tembotrione and atrazinee0
- Outcome
- phytotoxicitye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Evident phytotoxicity was observed with the combination of tembotrione and atrazine at V3 and V5 stages.”
t0“grain sorghum”
Claim · model-written summary
The V3 and V5 herbicide combination reduced plant height and sorghum stem diameter.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- combination of tembotrione and atrazinee1
- Outcome
- plant height, sorghum stem diametere0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Symptoms included reductions in plant height, sorghum stem diameter, panicle length, and cumulative dry mass of sorghum plant shoots.”
e1“combination of tembotrione and atrazine at V3 and V5 stages”
t0“grain sorghum”
Claim · model-written summary
The V3 and V5 herbicide combination reduced panicle length and shoot dry mass.
- Treatment
- combination of tembotrione and atrazinee1
- Outcome
- panicle length, and cumulative dry mass of sorghum plant shootse0
- Direction
- reductionse0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Symptoms included reductions in plant height, sorghum stem diameter, panicle length, and cumulative dry mass of sorghum plant shoots.”
e1“combination of tembotrione and atrazine at V3 and V5 stages”
Claim · model-written summary
Application stage did not influence thousand grains mass.
- Taxon
- grain sorghumSorghum bicolort0
- Treatment
- application stagese0
- Outcome
- thousand grains masse0
- Direction
- no influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no influence on thousand grains mass, regardless of application stages.”
t0“grain sorghum”
Claim · model-written summary
Tembotrione at 37.8 g ha-1 with atrazine at 1,000 g ha-1 was selective for grain sorghum at V7.
- Taxon
- grain sorghumSorghum bicolore0
- Organ / stage
- V7e0
- Treatment
- Tembotrione at 37.8 g ha-1 combined with atrazine at 1,000 g ha-1e0
- Outcome
- selective for grain sorghume0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tembotrione at 37.8 g ha-1 combined with atrazine at 1,000 g ha-1 was selective for grain sorghum when applied at V7”
Claim · model-written summary
Tembotrione at 37.8 g ha-1 with atrazine at 1,000 g ha-1 at V7 did not affect grain yield.
- Taxon
- grain sorghumSorghum bicolore0
- Organ / stage
- V7e0
- Treatment
- Tembotrione at 37.8 g ha-1 combined with atrazine at 1,000 g ha-1e0
- Outcome
- grain yielde0
- Direction
- without affectinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tembotrione at 37.8 g ha-1 combined with atrazine at 1,000 g ha-1 was selective for grain sorghum when applied at V7, without affecting grain yield.”
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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.