Abstract
Abstract Phytophthora root rot (PRR) is an important disease of alfalfa (Medicago sativa L.) in wet soils. Excess soil water (ESW) stress is required for the successful infection and development of PRR. The effects of P at 0, 40, and 80 μg.g‐1 soil and K at 0, 120, and 240 μg.g‐1 soil (in factorial combinations) on the severity of PRR or ESW stress was investigated on a PRR‐susceptible (Iroquois) and a resistant (Oneida) alfalfa cultivar in a greenhouse trial. P and K applications significantly increased the dry weight of tops prior to imposition of PRR or ESW stress. However, plants subjected to PRR or ESW stress did not respond significantly to P or K and there was no significant effect of P or K on the severity of PRR or ESW injury. The plants subjected to PRR or ESW stress had lower tissue P concentration than those under stress‐free conditions. Increasing P additions resulted in a significant increase in P concentration of Iroquois plants, while in Oneida the response was non‐significant. The response of K concentration in the plant to increasing K additions was dependant on P levels.
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Claims 10
Claim · model-written summary
P application increased top dry weight before stress.
- Taxon
- alfalfa
Medicago sativat0 - Treatment
- Pe0
- Outcome
- dry weight of topse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P and K applications significantly increased the dry weight of tops prior to imposition of PRR or ESW stress”
t0“alfalfa”
Claim · model-written summary
K application increased top dry weight before stress.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Ke0
- Outcome
- dry weight of topse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P and K applications significantly increased the dry weight of tops prior to imposition of PRR or ESW stress”
t0“alfalfa”
Claim · model-written summary
P did not significantly affect stressed plants.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Pe0
- Outcome
- plants subjected to PRR or ESW stresse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants subjected to PRR or ESW stress did not respond significantly to P or K”
t0“alfalfa”
Claim · model-written summary
K did not significantly affect stressed plants.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Ke0
- Outcome
- plants subjected to PRR or ESW stresse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants subjected to PRR or ESW stress did not respond significantly to P or K”
t0“alfalfa”
Claim · model-written summary
P did not significantly alter root rot or water injury severity.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Pe0
- Outcome
- severity of PRR or ESW injurye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant effect of P or K on the severity of PRR or ESW injury”
t0“alfalfa”
Claim · model-written summary
K did not significantly alter root rot or water injury severity.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Ke0
- Outcome
- severity of PRR or ESW injurye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant effect of P or K on the severity of PRR or ESW injury”
t0“alfalfa”
Claim · model-written summary
Stressed plants had lower tissue P than unstressed plants.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- PRR or ESW stresse0
- Outcome
- tissue P concentratione0
- Direction
- lowere0
- Comparator
- stress‐free conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plants subjected to PRR or ESW stress had lower tissue P concentration than those under stress‐free conditions”
t0“alfalfa”
Claim · model-written summary
Increasing P significantly increased Iroquois P concentration.
- Taxon
- alfalfaMedicago sativat0
- Material
- Iroquoise0
- Treatment
- Increasing P additionse0
- Outcome
- P concentratione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing P additions resulted in a significant increase in P concentration of Iroquois plants”
t0“alfalfa”
Claim · model-written summary
Oneida P concentration did not respond significantly to increasing P.
- Taxon
- alfalfaMedicago sativat0
- Material
- Oneidae0
- Outcome
- responsee0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while in Oneida the response was non‐significant”
t0“alfalfa”
Claim · model-written summary
Plant K concentration response to increasing K depended on P level.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- increasing K additionse0
- Outcome
- K concentration in the plante0
- Qualifier
- dependant on P levelse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The response of K concentration in the plant to increasing K additions was dependant on P levels”
t0“alfalfa”
The same questions in other papers
phosphorus · growth · Medicago sativa (alfalfa)Results differ
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- negative
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See all 9 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.