Abstract
Abstract Soils in the major bean ( Phaseolus vulgaris L.) producing regions of Latin America are frequently deficient in both P and N. With the fertilizer available to small farmers limited, the appropriate strategy for efficient fertilizer use could depend on the relative P requirements for plant and nodule development and N fixation in this species. In this field study the objective was to examine the growth, P distribution, and parameters of N 2 (C 2 H 2 ) fixation of bean cultivars at different levels of P fertilization. Seeds from 30 bean cultivars (replicates) were inoculated and lime pelleted, then sown into a Typic Dristandept soil low in available P. Phosphorus fertilization from 0 to 315 kg/ha as triple superphosphate was applied, then plant and nodule development, P distribution and N 2 (C 2 H 2 ) fixation measured 42 days after planting. Nodules were a strong sink for P, nodule weight increasing ninefold and P concentration in nodules by almost 50% over the range of P fertilization used. Other plant tissues benefited less. Levels of N 2 (C 2 H 2 ) fixation , specific nodule activity, and non structural carbohydrate in nodules were highly correlated with supply of P. Though P concentration in nodules reached 0.27%, there was no indication that the maximum fertilization rate used was adequate for full nodule development or nitrogen fixation. Further, none of the 30 cultivars tested showed reasonable N 2 (C 2 H 2 ) fixation at low rates of P fertilization. It may be concluded that identification of bean cultivars able to grow at low P, but still efficient in Na fixation, will be difficult.
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Claims 8
Claim · model-written summary
Nodule weight increased ninefold over the range of P fertilization used.
- Taxon
- Common Bean
Phaseolus vulgarist0 - Organ / stage
- nodulee1
- Treatment
- P fertilizatione1
- Outcome
- nodule weighte1
- Direction
- increasinge1
- Value
- ninefolde1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phosphorus Fertilization and Symbiotic Nitrogen Fixation in Common Bean”
e1“Nodules were a strong sink for P, nodule weight increasing ninefold and P concentration in nodules by almost 50% over the range of P fertilization used”
Claim · model-written summary
P concentration in nodules increased by almost 50% over the range of P fertilization used.
- Taxon
- Common BeanPhaseolus vulgarist0
- Organ / stage
- nodulese1
- Treatment
- P fertilizatione1
- Outcome
- P concentration in nodulese1
- Direction
- increaseinferrede1
- Value
- 50%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phosphorus Fertilization and Symbiotic Nitrogen Fixation in Common Bean”
e1“Nodules were a strong sink for P, nodule weight increasing ninefold and P concentration in nodules by almost 50% over the range of P fertilization used”
Claim · model-written summary
Other plant tissues benefited less from P fertilization than nodules did.
- Taxon
- Common BeanPhaseolus vulgarist0
- Treatment
- P fertilizatione1
- Outcome
- other plant tissuese2
- Direction
- benefited lesse2
- Comparator
- nodulese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phosphorus Fertilization and Symbiotic Nitrogen Fixation in Common Bean”
e1“Nodules were a strong sink for P, nodule weight increasing ninefold and P concentration in nodules by almost 50% over the range of P fertilization used”
e2“Other plant tissues benefited less”
Claim · model-written summary
N2 fixation levels were highly correlated with the supply of P.
- Taxon
- Common BeanPhaseolus vulgarist0
- Treatment
- supply of Pe3
- Outcome
- Levels of N 2 (C 2 H 2 ) fixatione3
- Direction
- highly correlatede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phosphorus Fertilization and Symbiotic Nitrogen Fixation in Common Bean”
e3“Levels of N 2 (C 2 H 2 ) fixation , specific nodule activity, and non structural carbohydrate in nodules were highly correlated with supply of P”
Claim · model-written summary
Specific nodule activity was highly correlated with the supply of P.
- Taxon
- Common BeanPhaseolus vulgarist0
- Treatment
- supply of Pe3
- Outcome
- specific nodule activitye3
- Direction
- highly correlatede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phosphorus Fertilization and Symbiotic Nitrogen Fixation in Common Bean”
e3“Levels of N 2 (C 2 H 2 ) fixation , specific nodule activity, and non structural carbohydrate in nodules were highly correlated with supply of P”
Claim · model-written summary
Non-structural carbohydrate in nodules was highly correlated with the supply of P.
- Taxon
- Common BeanPhaseolus vulgarist0
- Treatment
- supply of Pe3
- Outcome
- non structural carbohydrate in nodulese3
- Direction
- highly correlatede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phosphorus Fertilization and Symbiotic Nitrogen Fixation in Common Bean”
e3“Levels of N 2 (C 2 H 2 ) fixation , specific nodule activity, and non structural carbohydrate in nodules were highly correlated with supply of P”
Claim · model-written summary
No indication that the maximum P fertilization rate used was adequate for full nodule development or nitrogen fixation.
- Taxon
- Common BeanPhaseolus vulgarist0
- Outcome
- full nodule development or nitrogen fixatione4
- Qualifier
- there was no indication that the maximum fertilization rate used was adequatee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phosphorus Fertilization and Symbiotic Nitrogen Fixation in Common Bean”
e4“Though P concentration in nodules reached 0.27%, there was no indication that the maximum fertilization rate used was adequate for full nodule development or nitrogen fixation”
Claim · model-written summary
None of the 30 bean cultivars showed reasonable N2 fixation at low rates of P fertilization.
- Taxon
- Common BeanPhaseolus vulgarist0
- Outcome
- reasonable N 2 (C 2 H 2 ) fixatione5
- Qualifier
- at low rates of P fertilizatione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Phosphorus Fertilization and Symbiotic Nitrogen Fixation in Common Bean”
e5“none of the 30 cultivars tested showed reasonable N 2 (C 2 H 2 ) fixation at low rates of P fertilization”
The same questions in other papers
fertilization · symbiosis · Phaseolus vulgaris (common bean)Results differ
19 papers in the same direction as this paper · 15 in the opposite direction
- positive
- positive
- no effect
31 papers more in this group
See all 35 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.