Abstract
Abstract Changes to tillage practices can impact weed species composition and population dynamics in arable fields. The objective of this study was to evaluate and compare the impact of long‐term (36 yr) no‐tillage (NT) and conventional‐tillage (CT) systems on weed species composition, density, seedling emergence, and diversity, in a continuous soybean [ Glycine max (L.) Merr.] system in Southeast Texas. Results from 2016 and 2017 observations showed that weed species composition varied between CT and NT, and the total density was greater in NT (14 and 86 plants m –2 for summer and winter annuals, respectively) compared to CT (3 and 45 plants m –2 , respectively). Moreover, tall waterhemp [ Amaranthus tuberculatus (Moq.) Sauer], prostrate spurge [ Chamaesyce humistrata (Engelm. ex Gray) Small], and red sprangletop [ Dinebra panicea (Retz.) P.M. Peterson & N. Snow] emergence was delayed in NT compared to CT. Vertical distribution (70‐cm depth) of viable weed seeds in the soil profile was also influenced by tillage regime; greater proportion of weed seeds were present on the soil surface (0–5 cm) in NT (57–80% among different species) compared to CT (38–56%). However, weed diversity indices did not differ between CT and NT. Results indicate that long‐term NT, even with herbicide management, can lead to greater weed densities with a shift towards small‐seeded annual species (common purslane [ Portulaca oleraceae L.], parsley‐piert [ Aphanes arvensis L.], cutleaf groundcherry [ Physalis angulate L.]). Growers transitioning to NT should be cognizant of potential changes to weed population dynamics as a result of altered tillage regime and devise strategies for effective management.
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Claims 9
Claim · model-written summary
Weed species composition varied between conventional and no tillage.
- Taxon
- soybean
Glycine maxt0 - Treatment
- NTe0
- Outcome
- weed species compositione0
- Comparator
- CTe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“weed species composition varied between CT and NT”
t0“soybean”
Claim · model-written summary
Summer annual weed density was greater under no tillage, at 14 versus 3 plants m –2.
- Taxon
- soybeanGlycine maxt0
- Treatment
- NTe0
- Outcome
- total densitye0
- Direction
- greatere0
- Value
- 14 and 86 plants m –2e0
- Qualifier
- summer and winter annualse0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the total density was greater in NT (14 and 86 plants m –2 for summer and winter annuals, respectively) compared to CT (3 and 45 plants m –2 , respectively)”
t0“soybean”
Claim · model-written summary
Tall waterhemp emergence was delayed under no tillage.
- Taxon
- soybeanGlycine maxt0
- Treatment
- NTe0
- Interactor
- Amaranthus tuberculatus
.jpeg?width=60)
Amaranthus tuberculatuse0weed - Outcome
- emergencee0
- Direction
- delayede0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpeg?width=500)
Verbatim
e0“tall waterhemp [ Amaranthus tuberculatus (Moq.) Sauer], prostrate spurge [ Chamaesyce humistrata (Engelm. ex Gray) Small], and red sprangletop [ Dinebra panicea (Retz.) P.M. Peterson & N. Snow] emergence was delayed in NT compared to CT”
t0“soybean”
Claim · model-written summary
Prostrate spurge emergence was delayed under no tillage.
- Taxon
- soybeanGlycine maxt0
- Treatment
- NTe0
- Interactor
- Chamaesyce humistratae0weed
- Outcome
- emergencee0
- Direction
- delayede0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“prostrate spurge [ Chamaesyce humistrata (Engelm. ex Gray) Small], and red sprangletop [ Dinebra panicea (Retz.) P.M. Peterson & N. Snow] emergence was delayed in NT compared to CT”
t0“soybean”
Claim · model-written summary
Red sprangletop emergence was delayed under no tillage.
- Taxon
- soybeanGlycine maxt0
- Treatment
- NTe0
- Interactor
- Dinebra panicea
.jpg?width=60)
Dinebra paniceae0weed - Outcome
- emergencee0
- Direction
- delayede0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“red sprangletop [ Dinebra panicea (Retz.) P.M. Peterson & N. Snow] emergence was delayed in NT compared to CT”
t0“soybean”
Claim · model-written summary
A greater share of viable weed seeds was at the soil surface under no tillage.
- Taxon
- soybeanGlycine maxt0
- Treatment
- NTe0
- Outcome
- proportion of weed seedse0
- Direction
- greatere0
- Value
- 57–80%e0
- Qualifier
- 0–5 cme0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greater proportion of weed seeds were present on the soil surface (0–5 cm) in NT (57–80% among different species) compared to CT (38–56%)”
t0“soybean”
Claim · model-written summary
Weed diversity indices did not differ between tillage regimes.
- Taxon
- soybeanGlycine maxt0
- Treatment
- NTe0
- Outcome
- weed diversity indicese0
- Direction
- did not differe0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“weed diversity indices did not differ between CT and NT”
t0“soybean”
Claim · model-written summary
Long-term no tillage led to greater weed densities and a shift toward small-seeded annual species.
- Taxon
- soybeanGlycine maxt0
- Treatment
- long‐term NTe0
- Outcome
- weed densitiese0
- Direction
- greatere0
- Qualifier
- even with herbicide managemente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“long‐term NT, even with herbicide management, can lead to greater weed densities with a shift towards small‐seeded annual species”
t0“soybean”
Claim · model-written summary
Growers moving to no tillage should plan weed management for altered weed populations.
- Taxon
- soybeanGlycine maxt0
- Outcome
- devise strategies for effective managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growers transitioning to NT should be cognizant of potential changes to weed population dynamics as a result of altered tillage regime and devise strategies for effective management”
t0“soybean”
The same questions in other papers
tillage · weed · Glycine max (soybean)Positive and negative results
18 papers in the same direction as this paper · 25 in the opposite direction
- positive
- positive
- positive
40 papers more in this group
See all 44 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.