Abstract
Nitrogen uptake, distribution and remobilization in the vegetative and reproductive parts of the plant were studied in bean ( Phaseolus vulgaris L.) cultivars Negro Argel and Rio Tibagi inoculated with either Rhizobium strain C05 or 127 K‐17. Greenhouse grown plants were supplied with 2.5 mg N (plant) −1 day −1 as KNO 3 or K 15 NO 3 and the relative contribution to total plant nitrogen of mineral and symbiotically fixed nitrogen was determined. Control plants included those entirely dependent on fixed nitrogen as well as uninoculated plants supplied with 10 mg N (plant) −1 day −1 . No differences were observed between inoculated treatments in total nitrate reductase activity and in the amount of mineral nitrogen absorbed, but there were considerable differences in the contribution of fixed nitrogen. Nitrogen fixation supplied from 58 to 72% of the total nitrogen assimilated during the bean growth cycle and the symbiotic combinations fixed most of their nitrogen (66 to 78% of total nitrogen) after flowering. Maximum uptake of mineral nitrogen was in the 15‐day‐period between flowering and mid‐podfill (47 to 58% of total mineral nitrogen). Nitrogen partitioning varied with Rhizobium strains, and inoculation with strain C05 increased the nitrogen harvest index of both cultivars. Applied mineral nitrogen had a variable effect and in cv. Negro Argel was more beneficial to vegetative growth, resulting in smaller nitrogen harvest indices. Seed yield was not increased by heavy nitrogen fertilization. In contrast, cv. Rio Tibagi always benefited from nitrogen applications. Among the various nitrogen sources supplying the grain, the most important one was the fixed nitrogen translocated directly from nodules or after a rapid transfer through leaves, representing from 60 to 64% of the total nitrogen incorporated into the seeds.
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Claims 11
Claim · model-written summary
Inoculated treatments did not differ in total nitrate reductase activity or mineral nitrogen absorption.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarist0 - Treatment
- inoculated treatmentse0
- Outcome
- total nitrate reductase activity and in the amount of mineral nitrogen absorbede0
- Direction
- No differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No differences were observed between inoculated treatments in total nitrate reductase activity and in the amount of mineral nitrogen absorbed”
t0“Phaseolus vulgaris”
Claim · model-written summary
Nitrogen fixation supplied 58 to 72% of total nitrogen assimilated during bean growth.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Outcome
- total nitrogen assimilatede0
- Value
- 58 to 72%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fixation supplied from 58 to 72% of the total nitrogen assimilated during the bean growth cycle”
t0“Phaseolus vulgaris”
Claim · model-written summary
Symbiotic combinations fixed 66 to 78% of their total nitrogen after flowering.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Organ / stage
- after floweringe0
- Outcome
- their nitrogene0
- Value
- 66 to 78% of total nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the symbiotic combinations fixed most of their nitrogen (66 to 78% of total nitrogen) after flowering”
t0“Phaseolus vulgaris”
Claim · model-written summary
Mineral nitrogen uptake peaked between flowering and mid-podfill, accounting for 47 to 58% of total mineral nitrogen.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Organ / stage
- between flowering and mid‐podfille0
- Outcome
- uptake of mineral nitrogene0
- Direction
- Maximume0
- Value
- 47 to 58% of total mineral nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum uptake of mineral nitrogen was in the 15‐day‐period between flowering and mid‐podfill (47 to 58% of total mineral nitrogen)”
t0“Phaseolus vulgaris”
Claim · model-written summary
Nitrogen partitioning varied with Rhizobium strains.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Outcome
- Nitrogen partitioninge0
RhizobiumNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen partitioning varied with Rhizobium strains”
t0“Phaseolus vulgaris”
Claim · model-written summary
Inoculation with strain C05 increased nitrogen harvest index in both cultivars.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- inoculation with strain C05e0
- Interactor
- strain C05e0symbiont
- Outcome
- nitrogen harvest indexe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inoculation with strain C05 increased the nitrogen harvest index of both cultivars”
t0“Phaseolus vulgaris”
Claim · model-written summary
Applied mineral nitrogen benefited vegetative growth of Negro Argel.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Material
- Negro Argele0
- Treatment
- Applied mineral nitrogene0
- Outcome
- vegetative growthe0
- Direction
- more beneficiale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applied mineral nitrogen had a variable effect and in cv. Negro Argel was more beneficial to vegetative growth, resulting in smaller nitrogen harvest indices”
t0“Phaseolus vulgaris”
Claim · model-written summary
Applied mineral nitrogen resulted in smaller nitrogen harvest indices in Negro Argel.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Material
- Negro Argele0
- Treatment
- Applied mineral nitrogene0
- Outcome
- nitrogen harvest indicese0
- Direction
- smallere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applied mineral nitrogen had a variable effect and in cv. Negro Argel was more beneficial to vegetative growth, resulting in smaller nitrogen harvest indices”
t0“Phaseolus vulgaris”
Claim · model-written summary
Heavy nitrogen fertilization did not increase seed yield.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- heavy nitrogen fertilizatione0
- Outcome
- Seed yielde0
- Direction
- not increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed yield was not increased by heavy nitrogen fertilization”
t0“Phaseolus vulgaris”
Claim · model-written summary
Rio Tibagi benefited from nitrogen applications.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Material
- Rio Tibagie0
- Treatment
- nitrogen applicationse0
- Outcome
- benefitede0
- Direction
- benefitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cv. Rio Tibagi always benefited from nitrogen applications”
t0“Phaseolus vulgaris”
Claim · model-written summary
Fixed nitrogen translocated from nodules or through leaves was the largest grain nitrogen source, accounting for 60 to 64% of seed nitrogen.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Outcome
- total nitrogen incorporated into the seedse0
- Direction
- most importante0
- Value
- 60 to 64%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the most important one was the fixed nitrogen translocated directly from nodules or after a rapid transfer through leaves, representing from 60 to 64% of the total nitrogen incorporated into the seeds”
t0“Phaseolus vulgaris”
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