Abstract
Effect of different 15N labeled sources on the estimation of N2 fixation was investigated. The combination of 15N labeled ammonium sulfate, 15N labeled plant material, and 15N labeled ammonium sulfate with unlabeled plant material, was examined in pot experiments. Two cultivars of soybean (Glycine max) and one of mungbean (Vigna radiata) were used. No significant difference was observed among the treatments for the estimation of N2 fixation. This was due to the homogeneity and stability of the 15N abundance in soil which resulted in a similar N uptake from the soil by the N2 fixing and reference crops. The plant yield, total N uptake and amount of N2 fixed were higher in the Yellow Soil than in the Andosol. The amount of N2 fixed was strongly influenced by the plant growth and consequently it affected the plant yield. The slow decomposition of plant material in the Andosol resulted in a low yield in both the N2 fixing and reference crops. Thus, the artificial decrease of the available N content in soil, by application of plant material, did not stimulate N, fixation but suppressed plant growth and N2 fixation.
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Claims 10
Claim · model-written summary
The labeled-source treatments did not significantly differ in estimated nitrogen fixation.
- Taxon
- soybean (Glycine max) and one of mungbean (Vigna radiata)
Glycine max.jpg?width=60)
Vigna radiatae0 - Treatment
- 15N labeled ammonium sulfate, 15N labeled plant material, and 15N labeled ammonium sulfate with unlabeled plant materiale1
- Outcome
- estimation of N2 fixatione0
- Direction
- No significant differencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Two cultivars of soybean (Glycine max) and one of mungbean (Vigna radiata) were used. No significant difference was observed among the treatments for the estimation of N2 fixation”
e1“The combination of 15N labeled ammonium sulfate, 15N labeled plant material, and 15N labeled ammonium sulfate with unlabeled plant material, was examined in pot experiments”
Claim · model-written summary
Plant yield was higher in Yellow Soil than in Andosol.
- Taxon
- soybean (Glycine max) and one of mungbean (Vigna radiata)Glycine maxVigna radiatae1
- Treatment
- Yellow Soile0
- Outcome
- plant yielde0
- Direction
- highere0
- Comparator
- Andosole0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plant yield, total N uptake and amount of N2 fixed were higher in the Yellow Soil than in the Andosol”
e1“Two cultivars of soybean (Glycine max) and one of mungbean (Vigna radiata) were used”
Claim · model-written summary
Total N uptake was higher in Yellow Soil than in Andosol.
- Taxon
- soybean (Glycine max) and one of mungbean (Vigna radiata)Glycine maxVigna radiatae1
- Treatment
- Yellow Soile0
- Outcome
- total N uptakee0
- Direction
- highere0
- Comparator
- Andosole0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plant yield, total N uptake and amount of N2 fixed were higher in the Yellow Soil than in the Andosol”
e1“Two cultivars of soybean (Glycine max) and one of mungbean (Vigna radiata) were used”
Claim · model-written summary
The amount of nitrogen fixed was higher in Yellow Soil than in Andosol.
- Taxon
- soybean (Glycine max) and one of mungbean (Vigna radiata)Glycine maxVigna radiatae1
- Treatment
- Yellow Soile0
- Outcome
- amount of N2 fixede0
- Direction
- highere0
- Comparator
- Andosole0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plant yield, total N uptake and amount of N2 fixed were higher in the Yellow Soil than in the Andosol”
e1“Two cultivars of soybean (Glycine max) and one of mungbean (Vigna radiata) were used”
Claim · model-written summary
The amount of nitrogen fixed was strongly influenced by plant growth.
- Taxon
- soybean (Glycine max) and one of mungbean (Vigna radiata)Glycine maxVigna radiatae1
- Organ / stage
- plant growthe0
- Outcome
- amount of N2 fixede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of N2 fixed was strongly influenced by the plant growth”
e1“Two cultivars of soybean (Glycine max) and one of mungbean (Vigna radiata) were used”
Claim · model-written summary
Nitrogen fixation affected plant yield.
- Taxon
- soybean (Glycine max) and one of mungbean (Vigna radiata)Glycine maxVigna radiatae2
- Outcome
- plant yielde0
- Qualifier
- amount of N2 fixede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“consequently it affected the plant yield”
e1“The amount of N2 fixed was strongly influenced by the plant growth”
e2“Two cultivars of soybean (Glycine max) and one of mungbean (Vigna radiata) were used”
Claim · model-written summary
Slow plant-material decomposition in Andosol resulted in low yield in fixing and reference crops.
- Taxon
- soybean (Glycine max) and one of mungbean (Vigna radiata)Glycine maxVigna radiatae1
- Outcome
- low yielde0
- Qualifier
- slow decomposition of plant material in the Andosole0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The slow decomposition of plant material in the Andosol resulted in a low yield in both the N2 fixing and reference crops”
e1“Two cultivars of soybean (Glycine max) and one of mungbean (Vigna radiata) were used”
Claim · model-written summary
Applying plant material to decrease available soil N did not stimulate nitrogen fixation.
- Taxon
- soybean (Glycine max) and one of mungbean (Vigna radiata)Glycine maxVigna radiatae1
- Treatment
- application of plant materiale0
- Outcome
- N, fixatione0
- Direction
- did not stimulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the artificial decrease of the available N content in soil, by application of plant material, did not stimulate N, fixation”
e1“Two cultivars of soybean (Glycine max) and one of mungbean (Vigna radiata) were used”
Claim · model-written summary
Applying plant material to decrease available soil N suppressed plant growth.
- Taxon
- soybean (Glycine max) and one of mungbean (Vigna radiata)Glycine maxVigna radiatae1
- Treatment
- application of plant materiale0
- Outcome
- plant growthe0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by application of plant material, did not stimulate N, fixation but suppressed plant growth”
e1“Two cultivars of soybean (Glycine max) and one of mungbean (Vigna radiata) were used”
Claim · model-written summary
Applying plant material to decrease available soil N suppressed nitrogen fixation.
- Taxon
- soybean (Glycine max) and one of mungbean (Vigna radiata)Glycine maxVigna radiatae1
- Treatment
- application of plant materiale0
- Outcome
- N2 fixatione0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“by application of plant material, did not stimulate N, fixation but suppressed plant growth and N2 fixation”
e1“Two cultivars of soybean (Glycine max) and one of mungbean (Vigna radiata) were used”
The same questions in other papers
ammonium sulfate · symbiosis · Glycine max (soybean)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
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.