Abstract
Field experiment was conducted to study the effect of phosphorus application rate on content of some physiological and biochemical substances such as flavonoid,phenol,soluble sugar,and free amino acid in leaves at topping,and the occurrence of leaf brown spot after topping as well as leaf yield and quality. Results showed that increasing phosphorus application rate resulted in reduced content of flavonoid,phenol,and soluble sugar in leaf and more serious severity of leaf brown spot. Significant difference between treatments with the highest and lowest phosphorus amount was found with regards to content of flavonoid,phenol,and soluble sugar,while free amino acid content was higher in the treatment with moderate phosphorus rate. Although no obvious difference was recorded among treatments concerning yield and economic value,lower application rate of phosphorus seemed to result in relatively higher yield and economic value,higher ratio of reducing sugar versus total sugar and lower ratio of total sugar versus nicotine. Moderate application rate of phosphorus may be considered to reduce brown spot severity under experimental condition.
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Claims 9
Claim · model-written summary
Increasing phosphorus reduced leaf flavonoid, phenol and soluble sugar content.
- Taxon
- flue-cured tobaccot0
- Treatment
- increasing phosphorus application ratee0
- Outcome
- content of flavonoid,phenol,and soluble sugar in leafe0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“increasing phosphorus application rate resulted in reduced content of flavonoid,phenol,and soluble sugar in leaf”
t0“flue-cured tobacco”
Claim · model-written summary
Increasing phosphorus worsened leaf brown spot severity.
- Taxon
- flue-cured tobaccot0
- Treatment
- increasing phosphorus application ratee0
- Outcome
- severity of leaf brown spote0
- Direction
- more seriouse0
Not reportedComparator
Verbatim
e0“increasing phosphorus application rate resulted in reduced content of flavonoid,phenol,and soluble sugar in leaf and more serious severity of leaf brown spot”
t0“flue-cured tobacco”
Claim · model-written summary
Flavonoid, phenol and soluble sugar content differed significantly between highest and lowest phosphorus treatments.
- Taxon
- flue-cured tobaccot0
- Outcome
- content of flavonoid,phenol,and soluble sugare0
- Comparator
- treatments with the highest and lowest phosphorus amounte0
Not reportedDirection
Verbatim
e0“Significant difference between treatments with the highest and lowest phosphorus amount was found with regards to content of flavonoid,phenol,and soluble sugar”
t0“flue-cured tobacco”
Claim · model-written summary
Free amino acid content was higher at moderate phosphorus rate.
- Taxon
- flue-cured tobaccot0
- Treatment
- moderate phosphorus ratee0
- Outcome
- free amino acid contente0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“free amino acid content was higher in the treatment with moderate phosphorus rate”
t0“flue-cured tobacco”
Claim · model-written summary
Yield and economic value showed no obvious differences among phosphorus treatments.
Verbatim
e0“no obvious difference was recorded among treatments concerning yield and economic value”
t0“flue-cured tobacco”
Claim · model-written summary
Lower phosphorus rate appeared to yield relatively higher yield and economic value.
- Taxon
- flue-cured tobaccot0
- Treatment
- lower application rate of phosphoruse0
- Outcome
- yield and economic valuee0
- Direction
- relatively highere0
Not reportedComparator
Verbatim
e0“lower application rate of phosphorus seemed to result in relatively higher yield and economic value”
t0“flue-cured tobacco”
Claim · model-written summary
Lower phosphorus rate appeared to raise reducing sugar to total sugar ratio.
- Taxon
- flue-cured tobaccot0
- Treatment
- lower application rate of phosphoruse0
- Outcome
- ratio of reducing sugar versus total sugare0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“lower application rate of phosphorus seemed to result in relatively higher yield and economic value,higher ratio of reducing sugar versus total sugar”
t0“flue-cured tobacco”
Claim · model-written summary
Lower phosphorus rate appeared to lower total sugar to nicotine ratio.
- Taxon
- flue-cured tobaccot0
- Treatment
- lower application rate of phosphoruse0
- Outcome
- ratio of total sugar versus nicotinee0
- Direction
- lowere0
Not reportedComparator
Verbatim
e0“lower application rate of phosphorus seemed to result in relatively higher yield and economic value,higher ratio of reducing sugar versus total sugar and lower ratio of total sugar versus nicotine”
t0“flue-cured tobacco”
Claim · model-written summary
The authors suggest moderate phosphorus application to reduce brown spot severity under the experimental conditions.
Verbatim
e0“Moderate application rate of phosphorus may be considered to reduce brown spot severity under experimental condition”
t0“flue-cured tobacco”
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