Abstract
Alfalfa (Medicago sativa) is known to release allelopathic substances to affect the germination and growth of other plants, which have the potential to be applied in controlling weeds. Green foxtail (Setaria viridis) and barnyardgrass (Echinochloa crus-galli), as malignant weeds worldwide, also pose a serious threat to alfalfa in northern China. In this study, the sensitivity of the two weeds to the extracts from the first, second, and third stubbles of six varieties were investigated to further reveal the allelopathic interference of different varieties of alfalfa on notorious weeds. The germination rate, the length and fresh weight of seedlings, the length and fresh weight of roots were measured to elucidate the allelopathy of alfalfa extracts on the two weeds. The results suggested that: (1) The allelopathy of six alfalfa varieties tested showed obvious intraspecific differences, the inhibition of Zhongmu No.3 on green foxtail and barnyardgrass was weaker than other varieties, with the values of synthetical allelopathic effect (SAE) were -0.55 and -0.29, respectively. (2) The inhibitory effect of alfalfa extracts on green foxtail was enhanced with the increase of stubbles, while the differences between three stubbles on barnyardgrass were not clear, especially between the first and second stubbles. (3) Compared with barnyardgrass (SAE = -0.39 ~ -0.29), green foxtail (SAE = -0.65 ~ -0.52) was generally more susceptible to the extracts. (4) The inhibitory effect of alfalfa extracts on root was stronger than seedling in the same weed. For example, the third stubble extracts of Baoding variety inhibited 88.00% of the roots at the concentration of 0.01 g mL-1, but did not affect the seedlings of green foxtail. The study may help to comprehensively reveal the allelopathic effect of different alfalfa varieties in the first three stubbles on green foxtail and barnyardgrass, providing scientific evidence for weed control based on natural plant extracts in the future.
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Claims 8
Claim · model-written summary
Zhongmu No.3 inhibited green foxtail less strongly than other varieties, with SAE -0.55.
- Taxon
- green foxtaile0
- Treatment
- Zhongmu No.3e0
- Interactor
- Alfalfa
Medicago sativae1other - Outcome
- synthetical allelopathic effect (SAE)e0
- Direction
- weakere0
- Value
- -0.55e0
- Comparator
- other varietiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the inhibition of Zhongmu No.3 on green foxtail and barnyardgrass was weaker than other varieties, with the values of synthetical allelopathic effect (SAE) were -0.55 and -0.29, respectively”
e1“Alfalfa (Medicago sativa)”
Claim · model-written summary
Zhongmu No.3 inhibited barnyardgrass less strongly than other varieties, with SAE -0.29.
- Taxon
- barnyardgrass
Echinochloa crus-gallie0 - Treatment
- Zhongmu No.3e0
- Interactor
- AlfalfaMedicago sativae1other
- Outcome
- synthetical allelopathic effect (SAE)e0
- Direction
- weakere0
- Value
- -0.29e0
- Comparator
- other varietiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the inhibition of Zhongmu No.3 on green foxtail and barnyardgrass was weaker than other varieties, with the values of synthetical allelopathic effect (SAE) were -0.55 and -0.29, respectively”
e1“Alfalfa (Medicago sativa)”
Claim · model-written summary
Inhibition of green foxtail increased with successive alfalfa stubbles.
- Taxon
- green foxtaile0
- Treatment
- alfalfa extractse0
- Interactor
- alfalfaMedicago sativae0other
- Outcome
- inhibitory effecte0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibitory effect of alfalfa extracts on green foxtail was enhanced with the increase of stubbles”
Claim · model-written summary
Differences in barnyardgrass inhibition among the three stubbles were unclear.
- Taxon
- barnyardgrassEchinochloa crus-gallie0
- Outcome
- differences between three stubblese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the differences between three stubbles on barnyardgrass were not clear, especially between the first and second stubbles”
Claim · model-written summary
Green foxtail was more susceptible than barnyardgrass to the extracts.
Verbatim
e0“Compared with barnyardgrass (SAE = -0.39 ~ -0.29), green foxtail (SAE = -0.65 ~ -0.52) was generally more susceptible to the extracts”
Claim · model-written summary
Alfalfa extracts inhibited roots more strongly than seedlings of the same weed.
- Taxon
- alfalfaMedicago sativae0
- Organ / stage
- roote0
- Treatment
- alfalfa extractse0
- Outcome
- inhibitory effect of alfalfa extracts on roote0
- Direction
- strongere0
- Comparator
- seedlinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inhibitory effect of alfalfa extracts on root was stronger than seedling in the same weed”
Claim · model-written summary
Baoding third-stubble extract inhibited 88.00% of green foxtail roots at 0.01 g mL-1.
- Taxon
- green foxtaile0
- Treatment
- third stubble extracts of Baoding varietye0
- Outcome
- rootse0
- Direction
- inhibitede0
- Value
- 88.00%e0
- Qualifier
- 0.01 g mL-1e0
Not reportedComparator
Verbatim
e0“the third stubble extracts of Baoding variety inhibited 88.00% of the roots at the concentration of 0.01 g mL-1, but did not affect the seedlings of green foxtail”
Claim · model-written summary
Baoding third-stubble extract did not affect green foxtail seedlings at 0.01 g mL-1.
- Taxon
- green foxtaile0
- Treatment
- third stubble extracts of Baoding varietye0
- Outcome
- seedlings of green foxtaile0
- Direction
- did not affecte0
- Qualifier
- 0.01 g mL-1e0
Not reportedComparator
Verbatim
e0“the third stubble extracts of Baoding variety inhibited 88.00% of the roots at the concentration of 0.01 g mL-1, but did not affect the seedlings of green foxtail”
The same questions in other papers
botanical · organism · Medicago sativa (alfalfa)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- no effect
- negative
- negative
2 papers more in this group
See all 6 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.