Abstract
Abstract Plant utilization of P applied to soils is usually low. Utilization may be increased by having more roots present or by improving P uptake characteristics of the roots. The objective of this research was to determine the effect of varying corn ( Zea mays L.) root characteristics, by using different genotypes, on P uptake and to determine if the Claassen‐Barber simulation model predicted these differences accurately. Five corn genotypes were grown in the growth chamber in soil at two levels of P and harvested a three ages. Increasing P level increased shoot yield of all genotypes, but had little effect on the amount of roots. The root surface area per unit of shoot weight varied between genotypes at low soil P but not at high soil P. Wih high soil P here was a linear correlation with r = 0.98 and a slope of 0.97 between P uptake predicted by the simulation model and observed P uptake. At low soil P observed P uptake was double the predicted uptake, however, the correlation was r = 0.90. Root hair effects, not included in the simulation model, were probably the reason for the greater observed P uptake at low soil P. Differences between genotype in morphological and physiological root characteristics in. fluenced the amount of P absorbed by corn plants. It appears that genotypes could be developed that would be more efficient in absorbing P from soil.
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Claims 8
Claim · model-written summary
Higher soil P increased shoot yield in all corn genotypes.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- Increasing P levele0
- Outcome
- shoot yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing P level increased shoot yield of all genotypes”
t0“corn”
Claim · model-written summary
Higher soil P had little effect on root amount.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- P levele1
- Outcome
- amount of rootse0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but had little effect on the amount of roots.”
t0“corn”
e1“Increasing P level increased shoot yield of all genotypes”
Claim · model-written summary
Root surface area per shoot weight varied among genotypes at low P but not high P.
- Taxon
- cornZea mays subsp. mayst0
- Material
- genotypese0
- Outcome
- root surface area per unit of shoot weighte0
- Direction
- variede0
- Qualifier
- at low soil P but not at high soil Pe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The root surface area per unit of shoot weight varied between genotypes at low soil P but not at high soil P.”
t0“corn”
Claim · model-written summary
At high P, predicted and observed uptake were linearly correlated with r = 0.98.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- P uptake predicted by the simulation model and observed P uptakee0
- Value
- r = 0.98e0
- Qualifier
- a slope of 0.97e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wih high soil P here was a linear correlation with r = 0.98 and a slope of 0.97 between P uptake predicted by the simulation model and observed P uptake.”
t0“corn”
Claim · model-written summary
At low soil P, observed uptake was double predicted uptake.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- observed P uptakee0
- Direction
- doublee0
- Value
- r = 0.90e0
- Comparator
- predicted uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At low soil P observed P uptake was double the predicted uptake, however, the correlation was r = 0.90.”
t0“corn”
Claim · model-written summary
Root hairs probably explain underprediction of uptake at low P.
- Taxon
- cornZea mays subsp. mayst0
- Organ / stage
- Root haire0
- Outcome
- greater observed P uptakee0
- Qualifier
- at low soil Pe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root hair effects, not included in the simulation model, were probably the reason for the greater observed P uptake at low soil P.”
t0“corn”
Claim · model-written summary
Genotypic root morphology and physiology influenced corn P absorption.
- Taxon
- cornZea mays subsp. mayse0
- Material
- genotypee0
- Organ / stage
- roote0
- Outcome
- amount of P absorbede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences between genotype in morphological and physiological root characteristics in. fluenced the amount of P absorbed by corn plants.”
Claim · model-written summary
The authors consider development of more efficient P-absorbing genotypes feasible.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- genotypes could be developed that would be more efficient in absorbing P from soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It appears that genotypes could be developed that would be more efficient in absorbing P from soil.”
t0“corn”
The same questions in other papers
phosphorus · yield · Zea mays (maize)Positive and negative results
548 papers in the same direction as this paper · 69 in the opposite direction · 9 reporting no difference from an alternative
- positive
- no effect
- no effect
623 papers more in this group
See all 627 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.