Abstract
Significant losses in agricultural production are due to abiotic stresses, such as herbicide phytotoxicity. Dicamba (diglycolamine salt) is a herbicide used for post-emergent control of broadleaf weeds. It has a possibility to vapor-spread into neighboring fields causing damage to other crops. However, not every stress can be easily identified. Therefore, remote sensing has the potential as a new tool in early injury detection. This study evaluated the effects of simulated dicamba drift on the occurrence of phytotoxicity in soybeans (Glycine max). Soybean was assessed in seven dicamba doses (0, 0.056, 0.56, 5.6, 11.2, 28, 112 g ha−1) for changes in plant injury (scale of notes), spectral aspects (triangular greenness index (TGI), and shoot dry mass. The plants were photographed using a digital camera positioned at 1.2 m above the planting media level. The results indicate a positive effect of low dicamba doses (0.56 and 0.056 g a.e. ha−1) on TGI canopy distinction and shoot dry mass. Soybean TGI canopy distinction and the injury scale estimated at 45 days after sowing, and the soybean shoot dry mass observed at 99 days after sowing, presented significant and moderate Pearson’s r coefficient of correlations (r = −0.609 and 0.625), indicating TGI as a valid and practical spectral index for plant dicamba-injured evaluations.
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Claims 5
Claim · model-written summary
Low dicamba doses had a positive effect on soybean TGI canopy distinction.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- low dicamba doses (0.56 and 0.056 g a.e. ha−1)e0
- Outcome
- TGI canopy distinctione0
- Direction
- positive effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicate a positive effect of low dicamba doses (0.56 and 0.056 g a.e. ha−1) on TGI canopy distinction and shoot dry mass”
t0“Soybean”
Claim · model-written summary
Low dicamba doses had a positive effect on soybean shoot dry mass.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- low dicamba doses (0.56 and 0.056 g a.e. ha−1)e0
- Outcome
- shoot dry masse0
- Direction
- positive effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicate a positive effect of low dicamba doses (0.56 and 0.056 g a.e. ha−1) on TGI canopy distinction and shoot dry mass”
t0“Soybean”
Claim · model-written summary
At 45 days after sowing, soybean TGI canopy distinction and injury scale were moderately negatively correlated.
- Taxon
- SoybeanGlycine maxe0
- Treatment
- dicambat0
- Outcome
- TGI canopy distinction and the injury scalee0
- Value
- r = −0.609e0
- Qualifier
- 45 days after sowinge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean TGI canopy distinction and the injury scale estimated at 45 days after sowing, and the soybean shoot dry mass observed at 99 days after sowing, presented significant and moderate Pearson’s r coefficient of correlations (r = −0.609 and 0.625)”
t0“Dicamba”
Claim · model-written summary
Soybean TGI canopy distinction and shoot dry mass were moderately positively correlated.
- Taxon
- SoybeanGlycine maxe0
- Treatment
- dicambat0
- Outcome
- the soybean shoot dry masse0
- Value
- 0.625e0
- Qualifier
- 99 days after sowinge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean TGI canopy distinction and the injury scale estimated at 45 days after sowing, and the soybean shoot dry mass observed at 99 days after sowing, presented significant and moderate Pearson’s r coefficient of correlations (r = −0.609 and 0.625)”
t0“Dicamba”
Claim · model-written summary
The authors judged TGI a valid and practical index for evaluating dicamba injury in soybean.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- valid and practical spectral index for plant dicamba-injured evaluationse0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“indicating TGI as a valid and practical spectral index for plant dicamba-injured evaluations”
t0“Soybean”
The same questions in other papers
dicamba · growth · Glycine max (soybean)Results differ
9 papers in the same direction as this paper · 20 in the opposite direction
- negative
- negative
- negative
26 papers more in this group
See all 30 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.