Abstract
The objective was to evaluate weed phytosociology and similarities between crop management systems in the Chapadões region. The experiment was conducted at in agricultural area located in the municipality of Chapadão do Sul, MS, during the 2016/17 harvest. Three crop managements strategies were used: (1) cotton/soybean/Urochloa, (2) millet/soybean/millet and (3) millet/soybean/crotalaria. A phytosociological survey of weeds was carried out during soybean cultivation and cover crops growth, in succession. The evaluation area for each management strategy was 0.5 ha. Soybean surveys were carried out in October and January, while the cover crop surveys were performed in February and May. The relative frequency (RF), relative density (RD), relative abundance (AR), and relative importance (RI) of weeds, Venn diagram, and Jaccard and Sorenson similarity indices were evaluated. The management area represented by the cotton/soybean/Urochloa rotation had fewer weed species than others. The species Cenchrus echinatus, Digitaria insularis, Digitaria sanguinalis, Eleusine indica and Commelina benghalensis had the highest phytosociological indeces among the monocotyledons. Attention is required for managing the dicotyledons Amaranthus deflexus, Conyza canadensis and Senna obtusifolia despite their low indices because of herbicide resistant cases. The highest indeces of similarity were found between managements areas 2 and 3, which did not rely on cotton cultivation prior to soybeans.
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Claims 10
Claim · model-written summary
The cotton/soybean/Urochloa rotation had fewer weed species than the other rotations.
- Taxon
- soybean
Glycine maxe0 - Treatment
- cotton/soybean/Urochloa rotatione0
- Interactor
- weede0weed
- Outcome
- weed speciese0
- Direction
- fewere0
- Comparator
- otherse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The management area represented by the cotton/soybean/Urochloa rotation had fewer weed species than others.”
Claim · model-written summary
Cenchrus echinatus had among the highest phytosociological indices among monocotyledons.
- Taxon
- soybeanGlycine maxe1
- Interactor
- Cenchrus echinatus
Cenchrus echinatuse0weed - Outcome
- highest phytosociological indecese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The species Cenchrus echinatus, Digitaria insularis, Digitaria sanguinalis, Eleusine indica and Commelina benghalensis had the highest phytosociological indeces among the monocotyledons.”
t0“Crop management and its effects on weed occurrences”
e1“cotton/soybean/Urochloa rotation”
Claim · model-written summary
Digitaria insularis had among the highest phytosociological indices among monocotyledons.
- Taxon
- soybeanGlycine maxe1
- Interactor
- Digitaria insularis
Digitaria insularise0weed - Outcome
- highest phytosociological indecese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Digitaria insularis, Digitaria sanguinalis, Eleusine indica and Commelina benghalensis had the highest phytosociological indeces among the monocotyledons.”
t0“Crop management and its effects on weed occurrences”
e1“cotton/soybean/Urochloa rotation”
Claim · model-written summary
Digitaria sanguinalis had among the highest phytosociological indices among monocotyledons.
- Taxon
- soybeanGlycine maxe1
- Interactor
- Digitaria sanguinalis
.jpg?width=60)
Digitaria sanguinalise0weed - Outcome
- highest phytosociological indecese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Digitaria sanguinalis, Eleusine indica and Commelina benghalensis had the highest phytosociological indeces among the monocotyledons.”
t0“Crop management and its effects on weed occurrences”
e1“cotton/soybean/Urochloa rotation”
Claim · model-written summary
Eleusine indica had among the highest phytosociological indices among monocotyledons.
- Taxon
- soybeanGlycine maxe1
- Interactor
- Eleusine indica
Eleusine indicae0weed - Outcome
- highest phytosociological indecese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Eleusine indica and Commelina benghalensis had the highest phytosociological indeces among the monocotyledons.”
t0“Crop management and its effects on weed occurrences”
e1“cotton/soybean/Urochloa rotation”
Claim · model-written summary
Commelina benghalensis had among the highest phytosociological indices among monocotyledons.
- Taxon
- soybeanGlycine maxe1
- Interactor
- Commelina benghalensis
Commelina benghalensise0weed - Outcome
- highest phytosociological indecese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Commelina benghalensis had the highest phytosociological indeces among the monocotyledons.”
t0“Crop management and its effects on weed occurrences”
e1“cotton/soybean/Urochloa rotation”
Claim · model-written summary
Management of Amaranthus deflexus is advised despite low indices because of herbicide resistance cases.
- Taxon
- soybeanGlycine maxe1
- Interactor
- Amaranthus deflexus
_Amaranthus_deflexus_inflorescence.jpg?width=60)
Amaranthus deflexuse0weed - Outcome
- managing the dicotyledons Amaranthus deflexuse0
- Qualifier
- despite their low indices because of herbicide resistant casese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Amaranthus_deflexus_inflorescence.jpg?width=500)
Verbatim
e0“Attention is required for managing the dicotyledons Amaranthus deflexus, Conyza canadensis and Senna obtusifolia despite their low indices because of herbicide resistant cases.”
t0“Crop management and its effects on weed occurrences”
e1“cotton/soybean/Urochloa rotation”
Claim · model-written summary
Management of Conyza canadensis is advised despite low indices because of herbicide resistance cases.
- Taxon
- soybeanGlycine maxe1
- Interactor
- Conyza canadensis
Erigeron canadensise0weed - Outcome
- managing the dicotyledonse0
- Qualifier
- despite their low indices because of herbicide resistant casese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Attention is required for managing the dicotyledons Amaranthus deflexus, Conyza canadensis and Senna obtusifolia despite their low indices because of herbicide resistant cases.”
t0“Crop management and its effects on weed occurrences”
e1“cotton/soybean/Urochloa rotation”
Claim · model-written summary
Management of Senna obtusifolia is advised despite low indices because of herbicide resistance cases.
- Taxon
- soybeanGlycine maxe1
- Interactor
- Senna obtusifolia
Senna obtusifoliae0weed - Outcome
- managing the dicotyledonse0
- Qualifier
- despite their low indices because of herbicide resistant casese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Attention is required for managing the dicotyledons Amaranthus deflexus, Conyza canadensis and Senna obtusifolia despite their low indices because of herbicide resistant cases.”
t0“Crop management and its effects on weed occurrences”
e1“cotton/soybean/Urochloa rotation”
Claim · model-written summary
Rotations 2 and 3 had the highest weed-community similarity indices.
- Taxon
- soybeansGlycine maxe0
- Outcome
- indeces of similaritye0
- Direction
- higheste0
- Qualifier
- did not rely on cotton cultivation prior to soybeanse0
- Comparator
- managements areas 2 and 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest indeces of similarity were found between managements areas 2 and 3, which did not rely on cotton cultivation prior to soybeans.”
The same questions in other papers
rotation · weed · Glycine max (soybean)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
3 papers more in this group
See all 7 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.