Abstract
Integrated weed management tactics are necessary to develop cropping systems that enhance soil quality using conservation tillage and reduced herbicide or organic weed management. In this study, we varied planting and termination date of two cereal rye cultivars (‘Aroostook’ and ‘Wheeler’) and a rye/hairy vetch mixture to evaluate cover-crop biomass production and subsequent weed suppression in no-till planted soybean. Cover crops were killed with a burn-down herbicide and roller-crimper and the weed-suppressive effects of the remaining mulch were studied. Cover-crop biomass increased approximately 2,000 kg ha −1 from latest to earliest fall planting dates (August 25–October 15) and for each 10-d incremental delay in spring termination date (May 1–June 1). Biomass accumulation for cereal rye was best estimated using a thermal-based model that separated the effects of fall and spring heat units. Cultivars differed in their total biomass accumulation; however, once established, their growth rates were similar, suggesting the difference was mainly due to the earlier emergence of Aroostook rye. The earlier emergence of Aroostook rye may have explained its greater weed suppression than Wheeler, whereas the rye/hairy vetch mixture was intermediate between the two rye cultivars. Delaying cover-crop termination reduced weed density, especially for early- and late-emerging summer annual weeds in 2006. Yellow nutsedge was not influenced by cover-crop type or the timing of cover-crop management. We found that the degree of synchrony between weed species emergence and accumulated cover-crop biomass played an important role in defining the extent of weed suppression.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 12
Claim · model-written summary
Earlier fall cover-crop planting raised biomass about 2,000 kg ha −1.
Verbatim
e0“Cover-crop biomass increased approximately 2,000 kg ha −1 from latest to earliest fall planting dates (August 25–October 15)”
Claim · model-written summary
Each 10-day delay in spring termination raised cover-crop biomass about 2,000 kg ha −1.
- Taxon
- Cover-Cropt0
Not reportedComparator
Verbatim
e0“and for each 10-d incremental delay in spring termination date (May 1–June 1).”
t0“Cover-Crop”
e1“Cover-crop biomass increased approximately 2,000 kg ha −1”
Claim · model-written summary
A thermal model separating fall and spring heat units best estimated cereal rye biomass.
Not reportedComparatorValue
Verbatim
e0“Biomass accumulation for cereal rye was best estimated using a thermal-based model that separated the effects of fall and spring heat units.”
Claim · model-written summary
Cereal rye cultivars differed in total biomass accumulation.
Verbatim
e0“Cultivars differed in their total biomass accumulation”
t0“Cover-Crop”
e1“two cereal rye cultivars”
Claim · model-written summary
Established cereal rye cultivars had similar growth rates.
Verbatim
e0“once established, their growth rates were similar”
t0“Cover-Crop”
e1“two cereal rye cultivars”
Claim · model-written summary
Aroostook rye emerged earlier than Wheeler.
Verbatim
e0“earlier emergence of Aroostook rye.”
t0“Cover-Crop”
e1“two cereal rye cultivars”
Claim · model-written summary
Aroostook rye suppressed weeds more than Wheeler.
- Taxon
- soybean
Glycine maxt0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its greater weed suppression than Wheeler”
t0“Soybean”
e1“‘Aroostook’”
Claim · model-written summary
The rye-hairy vetch mixture had weed suppression intermediate between the two rye cultivars.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- rye/hairy vetch mixturee0
- Interactor
- Weedt0weed
- Outcome
- intermediate between the two rye cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rye/hairy vetch mixture was intermediate between the two rye cultivars.”
t0“Weed Suppression in No-Till Planted Soybean”
Claim · model-written summary
Delaying cover-crop termination reduced weed density, especially early and late emerging summer annual weeds in 2006.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Delaying cover-crop terminatione0
- Interactor
- summer annual weedse0weed
- Outcome
- weed densitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delaying cover-crop termination reduced weed density, especially for early- and late-emerging summer annual weeds in 2006.”
t0“Soybean”
Claim · model-written summary
Yellow nutsedge was unaffected by cover-crop type.
- Taxon
- soybeanGlycine maxt0
- Treatment
- cover-crop typee0
- Interactor
- Yellow nutsedgee0weed
- Outcome
- Yellow nutsedgee0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yellow nutsedge was not influenced by cover-crop type or the timing of cover-crop management.”
t0“Soybean”
Claim · model-written summary
Yellow nutsedge was unaffected by cover-crop management timing.
- Taxon
- soybeanGlycine maxt0
- Treatment
- timing of cover-crop managemente0
- Interactor
- Yellow nutsedgee0weed
- Outcome
- Yellow nutsedgee0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yellow nutsedge was not influenced by cover-crop type or the timing of cover-crop management.”
t0“Soybean”
Claim · model-written summary
Weed suppression depended on synchrony between weed emergence and accumulated cover-crop biomass.
- Taxon
- soybeanGlycine maxt0
- Interactor
- weed speciese0weed
- Outcome
- extent of weed suppressione0
- Qualifier
- degree of synchrony between weed species emergence and accumulated cover-crop biomasse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the degree of synchrony between weed species emergence and accumulated cover-crop biomass played an important role in defining the extent of weed suppression.”
t0“Soybean”
The same questions in other papers
cover crop · weed · Glycine max (soybean)Positive and negative results
18 papers in the same direction as this paper · 4 in the opposite direction · 1 reporting no difference from an alternative
- positive
- positive
- positive
20 papers more in this group
See all 24 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.