Abstract
Abstract Uncertainty remains concerning the magnitude of symbiotic N fixation by the soybean crop [ Glycine max (L.) Merr.] when grown under varied N management systems. For deriving further enlightenment on the issue, 15 N‐enriched fertilizer was applied on two soybean isolines with objectives of measuring the fraction of N derived from symbiotic fixation, residual soil N and applied fertilizer N. Plant samples were collected at full bloom, beginning‐seed, and full‐maturity stages in a field experiment conducted at the University of Nebraska Field Lab on Sharpsburg soil (Typic Argiudoll) of 3.3% organic matter content. Nitrogen fertilizer was applied at rates of 45, 89, and 134 kg/ha at planting or at full bloom. Nitrogen fertilization had no significant influence on yield or N and oil concentration of the nodulating isoline seed but increased these parameters of the non‐nodulating isoline, with delay in N fertilization being distinctly advantageous. Fertilizer utilization percentage by both isolines at later growth stages increased as fertilizer rate increased, contrary to N utilization patterns of cereal crops. “A ” value increases with increased N fertilizer rates suggested a soil N priming and/or root extension effect. Less plant N came from the soil with delayed N fertilizer application. Fertilizer applied at planting at rates above 45 kg N/ha reduced the symbiotically fixed N fraction, whereas delaying fertilizer application had no such influence at any rate of N employed.
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Claims 10
Claim · model-written summary
Nitrogen fertilization had no significant influence on nodulating-isoline seed yield.
- Taxon
- soybean
Glycine maxe1 - Material
- nodulating isolinee0
- Treatment
- Nitrogen fertilizatione0
- Outcome
- yielde0
- Direction
- no significant influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization had no significant influence on yield or N and oil concentration of the nodulating isoline seed”
e1“soybean crop”
Claim · model-written summary
Nitrogen fertilization had no significant influence on nodulating-isoline seed nitrogen and oil concentrations.
- Taxon
- soybeanGlycine maxe1
- Material
- nodulating isolinee0
- Treatment
- Nitrogen fertilizatione0
- Outcome
- N and oil concentratione0
- Direction
- no significant influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization had no significant influence on yield or N and oil concentration of the nodulating isoline seed”
e1“soybean crop”
Claim · model-written summary
Nitrogen fertilization increased non-nodulating-isoline seed yield.
- Taxon
- soybeanGlycine maxe2
- Material
- non‐nodulating isolinee0
- Treatment
- Nitrogen fertilizatione3
- Outcome
- yielde1
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased these parameters of the non‐nodulating isoline”
e1“no significant influence on yield or N and oil concentration”
e2“soybean crop”
e3“Nitrogen fertilization had no significant influence”
Claim · model-written summary
Nitrogen fertilization increased non-nodulating-isoline seed nitrogen and oil concentrations.
- Taxon
- soybeanGlycine maxe1
- Material
- non‐nodulating isolinee0
- Treatment
- Nitrogen fertilizatione0
- Outcome
- N and oil concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization had no significant influence on yield or N and oil concentration of the nodulating isoline seed but increased these parameters of the non‐nodulating isoline”
e1“soybean crop”
Claim · model-written summary
Delaying fertilizer application was advantageous for non-nodulating soybean.
- Taxon
- soybeanGlycine maxe2
- Material
- non‐nodulating isolinee1
- Outcome
- distinctly advantageouse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with delay in N fertilization being distinctly advantageous.”
e1“non‐nodulating isoline”
e2“soybean crop”
Claim · model-written summary
Fertilizer utilization percentage increased with fertilizer rate in both isolines at later stages.
- Taxon
- soybeanGlycine maxe1
- Treatment
- fertilizer ratee0
- Outcome
- Fertilizer utilization percentagee0
- Direction
- increasede0
- Qualifier
- later growth stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer utilization percentage by both isolines at later growth stages increased as fertilizer rate increased”
e1“soybean crop”
Claim · model-written summary
A value increased with fertilizer rates, suggesting soil nitrogen priming or root extension.
- Taxon
- soybeanGlycine maxe1
- Treatment
- N fertilizer ratese0
- Outcome
- “A ” valuee0
- Direction
- increasese0
- Qualifier
- soil N priming and/or root extension effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0““A ” value increases with increased N fertilizer rates suggested a soil N priming and/or root extension effect.”
e1“soybean crop”
Claim · model-written summary
Delayed nitrogen fertilizer application reduced the portion of plant nitrogen derived from soil.
- Taxon
- soybeanGlycine maxe1
- Treatment
- delayed N fertilizer applicatione0
- Outcome
- plant N came from the soile0
- Direction
- Lesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Less plant N came from the soil with delayed N fertilizer application.”
e1“soybean crop”
Claim · model-written summary
Fertilizer above 45 kg N/ha at planting reduced the symbiotically fixed nitrogen fraction.
- Taxon
- soybeanGlycine maxe1
- Treatment
- Fertilizer applied at planting at rates above 45 kg N/hae0
- Outcome
- symbiotically fixed N fractione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer applied at planting at rates above 45 kg N/ha reduced the symbiotically fixed N fraction”
e1“soybean crop”
Claim · model-written summary
Delayed fertilizer application did not reduce symbiotically fixed nitrogen at any tested rate.
- Taxon
- soybeanGlycine maxe2
- Treatment
- delaying fertilizer applicatione0
- Outcome
- symbiotically fixed N fractione1
- Direction
- no such influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“delaying fertilizer application had no such influence at any rate of N employed.”
e1“symbiotically fixed N fraction”
e2“soybean crop”
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See all 1,192 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.