Abstract
Abstract A relationship among Cu, N, and Rhizobium japonicum was hypothesized because previous research had shown that (a) 35% or more legumes in the Atlantic Coastal Plain have Cu concentrations of 6 mg kg‐1 or less, (b) Cu influences N fixation in some legumes, and (c) irrigated soybean (Glycine max L. Merr.) can accumulate most of its N through fixation. Soybean were grown on a Cu‐deficient Norfolk (fine‐loamy, siliceous, thermic Typic Paleudult) loamy sand with 3 fertilizer sources of Cu, 2 strains of R. japonicum, and with or without 336 kg ha‐1 of N fertilizer. Application of Cu significantly increased the number of pods plant‐1 suggesting pod abortion in determinate soybean may be caused by low Cu, but seed yield was not increased. Fertilization with N increased vegetative growth, but not total biomass or seed yield. Inoculation with R. japonicum strain 110 significantly increased seed yield by 0.3 Mg ha‐1 compared to strain 587. The yield increase was similar with or without fertilizer N application indicating strain response was not totally caused by improved N efficiency. There was no relationship between seed yield and nodule occupancy as measured by the ELISA technique.
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Claims 8
Claim · model-written summary
Copper application significantly increased soybean pods per plant.
- Taxon
- soybean
Glycine maxe0 - Treatment
- Cue0
- Outcome
- number of pods plant‐1e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of Cu significantly increased the number of pods plant‐1 suggesting pod abortion in determinate soybean may be caused by low Cu, but seed yield was not increased.”
Claim · model-written summary
Copper application did not increase soybean seed yield.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Cue0
- Outcome
- seed yielde0
- Direction
- not increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of Cu significantly increased the number of pods plant‐1 suggesting pod abortion in determinate soybean may be caused by low Cu, but seed yield was not increased.”
Claim · model-written summary
Nitrogen fertilization increased soybean vegetative growth.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Ne0
- Outcome
- vegetative growthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization with N increased vegetative growth, but not total biomass or seed yield.”
t0“soybean”
Claim · model-written summary
Nitrogen fertilization did not increase soybean total biomass.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Ne0
- Outcome
- total biomasse0
- Direction
- note0
- Qualifier
- not total biomass or seed yielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization with N increased vegetative growth, but not total biomass or seed yield.”
t0“soybean”
Claim · model-written summary
Nitrogen fertilization did not increase soybean seed yield.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Ne0
- Outcome
- seed yielde0
- Direction
- note0
- Qualifier
- not total biomass or seed yielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization with N increased vegetative growth, but not total biomass or seed yield.”
t0“soybean”
Claim · model-written summary
R. japonicum strain 110 inoculation increased soybean seed yield by 0.3 Mg ha‐1 relative to strain 587.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Inoculation with R. japonicum strain 110e0
- Interactor
- R. japonicum strain 110e0symbiont
- Outcome
- seed yielde0
- Direction
- increasede0
- Value
- 0.3 Mg ha‐1e0
- Comparator
- strain 587e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation with R. japonicum strain 110 significantly increased seed yield by 0.3 Mg ha‐1 compared to strain 587.”
t0“soybean”
Claim · model-written summary
The strain-associated soybean yield increase was similar with and without nitrogen fertilizer.
- Taxon
- soybeanGlycine maxt0
- Outcome
- yield increasee0
- Direction
- similare0
- Comparator
- with or without fertilizer N applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield increase was similar with or without fertilizer N application indicating strain response was not totally caused by improved N efficiency.”
t0“soybean”
Claim · model-written summary
Soybean seed yield was unrelated to nodule occupancy by ELISA.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- nodulee0
- Outcome
- seed yielde0
- Direction
- no relationshipe0
- Qualifier
- nodule occupancye0
Not reportedTreatmentSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no relationship between seed yield and nodule occupancy as measured by the ELISA technique.”
t0“soybean”
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