Abstract
Cover crops can provide a variety of benefits to an agricultural system: weed suppression, soil quality improvement, and soil water infiltration. Although there is ample research documenting weed suppression from cover crops, the mechanics of the suppression are not implicitly understood. Along with the aforementioned positive attributes, negative allelopathic effects on row crops planted into cover crop systems have been documented. The objective of this study was to evaluate the allelopathic potential of certain cover crop species on soybean (Glycine max L.) and goosegrass (Eleusine indica L.) germination and early seedling growth under controlled environments in petri dish and pot experiments. Leachates from above-ground biomass of five cover crop species, wheat (Triticum aestivum L.), cereal rye (Secale cereale), hairy vetch (Vicia villosa), crimson clover (Trifolium incarnatum L.), and canola (Brassica napus L.), from two locations (East and Middle Tennessee) were extracted and applied at 0 (water) and 50 v/v. In experiment I, both soybean and goosegrass seeds were examined, and, in experiment II, only soybean seeds were examined under the application of cover crop leachates. Most cover crop leachates from both locations significantly reduced the soybean seedling root length (p < 0.01). Overall, the application of canola extract (East Tennessee) suppressed soybean seed germination the most (28%) compared to deionized water. For goosegrass, the wheat cover crop leachate significantly reduced seedling root length (p < 0.01). In experiment II, the soybean root nodulation was significantly increased with the wheat extract treatment compared to deionized water. While the results indicate that the location and environment may change cover crop species allelopathic potential, the wheat cover crop leachate had the most potent allelopathic impact on goosegrass germination and growth; however, had the lowest observed adverse effect on our tested row crop, soybean.
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Claims 6
Claim · model-written summary
Most cover crop leachates significantly reduced soybean seedling root length.
- Taxon
- soybean
Glycine maxe0 - Treatment
- cover crop leachatese0
- Outcome
- seedling root lengthe0
- Direction
- reducede0
- Setting
- both locationse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most cover crop leachates from both locations significantly reduced the soybean seedling root length (p < 0.01)”
Claim · model-written summary
East Tennessee canola extract reduced soybean seed germination by 28% relative to deionized water.
- Taxon
- soybeanGlycine maxe0
- Treatment
- canola extracte0
- Interactor
- canola
.jpg?width=60)
Brassica napus var. napuse0other - Outcome
- seed germinatione0
- Direction
- suppressede0
- Value
- 28%e0
- Comparator
- deionized watere0
- Setting
- East Tennesseee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“the application of canola extract (East Tennessee) suppressed soybean seed germination the most (28%) compared to deionized water”
Claim · model-written summary
Wheat cover crop leachate significantly reduced goosegrass seedling root length.
- Taxon
- goosegrasse0
- Treatment
- wheat cover crop leachatee0
- Interactor
- wheat
Triticum aestivume0other - Outcome
- seedling root lengthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For goosegrass, the wheat cover crop leachate significantly reduced seedling root length (p < 0.01)”
Claim · model-written summary
Wheat extract significantly increased soybean root nodulation relative to deionized water.
- Taxon
- soybeanGlycine maxe0
- Treatment
- wheat extract treatmente0
- Interactor
- wheatTriticum aestivume0other
- Outcome
- root nodulatione0
- Direction
- increasede0
- Comparator
- deionized watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the soybean root nodulation was significantly increased with the wheat extract treatment compared to deionized water”
Claim · model-written summary
Wheat leachate had the strongest reported allelopathic impact on goosegrass germination and growth.
- Taxon
- goosegrasse0
- Treatment
- wheat cover crop leachatee0
- Interactor
- wheatTriticum aestivume0other
- Outcome
- germination and growthe0
- Direction
- most potente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the wheat cover crop leachate had the most potent allelopathic impact on goosegrass germination and growth”
Claim · model-written summary
Wheat leachate had the lowest observed adverse effect on soybean.
- Taxon
- soybeanGlycine maxe0
- Outcome
- adverse effecte0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“had the lowest observed adverse effect on our tested row crop, soybean”
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