Abstract
A field experiment was carried out to study the effects of different nitrogen rate and ratio of base and topdressing on nitrogen uptake,accumulation,soil NO3——N contents,and leaf quality and yield.The results showed that,the effects were not obvious in dry matter accumulation amounts,nitrogen content and nitrogen accumulation amounts of different treatments in early growth stage of flue-cured tobacco,reducing nitrogen application rate and basal dosage reduced nitrogen content and nitrogen accumulation amounts in the mature leaves,and reducing nitrogen application rate made soil NO3——N contents in early and late growth stage of flue-cured tobacco decreased obviously.As the nitrogen increased,the reducing sugar contents and the ratio of total sugar to total plant alkaloid contents decreased,but total plant alkaloid and total nitrogen contents increased.The reducing sugar contents and the ratio of total sugar to plant alkaloid contents of the 30:70 of base and topdressing were larger than those of other treatments,the total plant alkaloid and total nitrogen contents were smaller,and the scent quality and aftertaste gained higher evaluation.The treatments of nitrogen rate 90 kg/ha,both of the 50:50 and 30:70 of base and topdressing increased economic value.Considering the yield,quality and the combined values,the best treatment was nitrogen rate 90 kg/ha with 30:70 of base: topdressing.
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Claims 11
Claim · model-written summary
Early dry matter accumulation and nitrogen accumulation differed little among treatments.
- Taxon
- flue-cured tobaccoe0
- Treatment
- different treatmentse0
- Outcome
- dry matter accumulation amounts,nitrogen content and nitrogen accumulation amountse0
- Direction
- not obviouse0
Not reportedComparator
Verbatim
e0“the effects were not obvious in dry matter accumulation amounts,nitrogen content and nitrogen accumulation amounts of different treatments in early growth stage of flue-cured tobacco”
Claim · model-written summary
Reduced nitrogen rate and basal dosage lowered nitrogen content and accumulation in mature leaves.
- Taxon
- flue-cured tobaccot0
- Organ / stage
- mature leavese0
- Treatment
- reducing nitrogen application rate and basal dosagee0
- Outcome
- nitrogen content and nitrogen accumulation amountse0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“reducing nitrogen application rate and basal dosage reduced nitrogen content and nitrogen accumulation amounts in the mature leaves”
t0“Flue-cured Tobacco”
Claim · model-written summary
Reducing nitrogen rate lowered soil nitrate in early and late growth stages.
Not reportedTaxonComparator
Verbatim
e0“reducing nitrogen application rate made soil NO3——N contents in early and late growth stage of flue-cured tobacco decreased obviously”
Claim · model-written summary
Increasing nitrogen lowered reducing sugar content and the total sugar to alkaloid ratio.
- Taxon
- flue-cured tobaccot0
- Treatment
- nitrogene0
- Outcome
- reducing sugar contents and the ratio of total sugar to total plant alkaloid contentse0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“As the nitrogen increased,the reducing sugar contents and the ratio of total sugar to total plant alkaloid contents decreased”
t0“Flue-cured Tobacco”
Claim · model-written summary
Increasing nitrogen raised total plant alkaloid and total nitrogen content.
- Taxon
- flue-cured tobaccot0
- Treatment
- nitrogene1
- Outcome
- total plant alkaloid and total nitrogen contentse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“but total plant alkaloid and total nitrogen contents increased”
t0“Flue-cured Tobacco”
e1“As the nitrogen increased,the reducing sugar contents and the ratio of total sugar to total plant alkaloid contents decreased”
Claim · model-written summary
A 30:70 basal to topdressing ratio produced higher reducing sugar and sugar to alkaloid ratio than other treatments.
Verbatim
e0“The reducing sugar contents and the ratio of total sugar to plant alkaloid contents of the 30:70 of base and topdressing were larger than those of other treatments”
t0“Flue-cured Tobacco”
Claim · model-written summary
The 30:70 ratio produced lower total alkaloid and nitrogen contents.
- Taxon
- flue-cured tobaccot0
- Treatment
- 30:70 of base and topdressinge1
- Outcome
- total plant alkaloid and total nitrogen contentse0
- Direction
- smallere0
Not reportedComparator
Verbatim
e0“the total plant alkaloid and total nitrogen contents were smaller”
t0“Flue-cured Tobacco”
e1“The reducing sugar contents and the ratio of total sugar to plant alkaloid contents of the 30:70 of base and topdressing were larger than those of other treatments”
Claim · model-written summary
The 30:70 ratio received higher scent quality and aftertaste evaluation.
- Taxon
- flue-cured tobaccot0
- Treatment
- 30:70 of base and topdressinge1
- Outcome
- scent quality and aftertastee0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“the scent quality and aftertaste gained higher evaluation”
t0“Flue-cured Tobacco”
e1“The reducing sugar contents and the ratio of total sugar to plant alkaloid contents of the 30:70 of base and topdressing were larger than those of other treatments”
Claim · model-written summary
Nitrogen at 90 kg/ha with a 50:50 topdressing ratio increased economic value.
- Taxon
- flue-cured tobaccot0
- Treatment
- nitrogen rate 90 kg/hae0
- Outcome
- economic valuee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“The treatments of nitrogen rate 90 kg/ha,both of the 50:50 and 30:70 of base and topdressing increased economic value.”
t0“Flue-cured Tobacco”
Claim · model-written summary
Nitrogen at 90 kg/ha with a 30:70 ratio increased economic value.
- Taxon
- flue-cured tobaccot0
- Treatment
- 30:70 of base and topdressinge0
- Outcome
- economic valuee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“The treatments of nitrogen rate 90 kg/ha,both of the 50:50 and 30:70 of base and topdressing increased economic value.”
t0“Flue-cured Tobacco”
Claim · model-written summary
The authors judged 90 kg/ha nitrogen with a 30:70 basal to topdressing ratio best overall.
Verbatim
e0“the best treatment was nitrogen rate 90 kg/ha with 30:70 of base: topdressing”
t0“Flue-cured Tobacco”
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