Abstract
This study aimed to evaluate the influence of low doses of 2,4-D on the agronomic traits of upland rice applied at different stages of crop growth. The work was carried out in a randomized completly blocks, and consisted of the application of 5 low doses of the 2,4-D herbicide (0, 0.68, 1.36, 2.04, 3.40 and 5.44 g acid equivalent (e.a.) ha−1) in two stages of rice development (tillering and floral differentiation). Nitrogen contentes in leaves, SPAD index and yield are higher when low doses of 2,4-D is applied in the tillering stage. Application of 2,4-D at a dose of 2.04 g a.e ha−1 results in a 19% increase in the number of spikelet per panicle. On the other hand, there is no effect of the application of low doses of 2,4-D on height, number of stems, active tillering and weight of 100 seeds. Our results contribute to increase knowledge of the hormesis effect in plants in order to increase crop yield.
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Claims 5
Claim · model-written summary
Leaf nitrogen content and SPAD index of upland rice were higher when low doses of 2,4-D were applied at the tillering stage.
- Taxon
- upland rice
Oryza sativat0 - Treatment
- low doses of 2,4-De1
- Outcome
- Nitrogen contentes in leaves, SPAD indexe1
- Direction
- highere1
- Qualifier
- tillering stagee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“upland rice”
e1“Nitrogen contentes in leaves, SPAD index and yield are higher when low doses of 2,4-D is applied in the tillering stage”
Claim · model-written summary
Upland rice yield was higher when low doses of 2,4-D were applied at the tillering stage.
- Taxon
- upland riceOryza sativat0
- Treatment
- low doses of 2,4-De1
- Outcome
- yielde1
- Direction
- highere1
- Qualifier
- tillering stagee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“upland rice”
e1“Nitrogen contentes in leaves, SPAD index and yield are higher when low doses of 2,4-D is applied in the tillering stage”
Claim · model-written summary
A 2,4-D dose of 2.04 g a.e. per ha increased the number of spikelets per panicle of upland rice by 19%.
- Taxon
- upland riceOryza sativat0
- Treatment
- 2,4-D at a dose of 2.04 g a.e ha−1e1
- Outcome
- number of spikelet per paniclee1
- Direction
- increasee1
- Value
- 19%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“upland rice”
e1“Application of 2,4-D at a dose of 2.04 g a.e ha−1 results in a 19% increase in the number of spikelet per panicle”
Claim · model-written summary
Low doses of 2,4-D had no effect on height, number of stems or active tillering of upland rice.
- Taxon
- upland riceOryza sativat0
- Treatment
- low doses of 2,4-De1
- Outcome
- height, number of stems, active tilleringe1
- Direction
- no effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“upland rice”
e1“there is no effect of the application of low doses of 2,4-D on height, number of stems, active tillering”
Claim · model-written summary
Low doses of 2,4-D had no effect on the weight of 100 seeds of upland rice.
- Taxon
- upland riceOryza sativat0
- Treatment
- low doses of 2,4-De1
- Outcome
- weight of 100 seedse1
- Direction
- no effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“upland rice”
e1“there is no effect of the application of low doses of 2,4-D on height, number of stems, active tillering and weight of 100 seeds”
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