Abstract
【Objective】 This study attempted to investigate the characteristics of nitrogen supply on paddy soil and its effects on nitrogen accumulation and distribution and quality of flue-cured tobacco. 【Method】 In situ incubation experiment and 15N-labelled field trials were conducted to study the characteristics of soil nitrogen mineralization, the accumulation and distribution of different sources of nitrogen in flue-cured tobacco plants and the yield and quality of tobacco leaves at nitrogen rates of 0 and 90 kg·ha-1 on paddy soil at Zhaowei Village Group 6 and Zhaowei Experiment Base in Hongta District, Yuxi City, Yunnan Province, China【.Result】The abilities of soil nitrogen mineralization were great in the fields of Group 6 and Zhaowei Experiment Base. Under the condition of applying nitrogen 90 kg·ha-1, most nitrogen of tobacco plants derived from soil, and with growth period extending and stalk position ascending, both soil nitrogen content and the ratio to total nitrogen evidently increased. The experiments also indicated that using nitrogen fertilizer had little effect on increasing yield, but remarkably increased nitrogen and nicotine content, and improved the quality of tobacco leaves. However, the nicotine concentrations of upper leaves were too high for the excessive supplement of soil nitrogen. 【Conclusion】Results of study suggests that controlling the supplement amount of soil nitrogen on paddy soil in latter period of tobacco growth is important to improve the quality of tobacco leaves, especially to upper leaves.
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Claims 7
Claim · model-written summary
Under 90 kg·ha-1 nitrogen, most nitrogen in tobacco plants was derived from soil.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Treatment
- applying nitrogen 90 kg·ha-1e1
- Outcome
- nitrogen of tobacco plants derived from soile1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue-Cured Tobacco Plant”
e1“Under the condition of applying nitrogen 90 kg·ha-1, most nitrogen of tobacco plants derived from soil”
Claim · model-written summary
Soil nitrogen content and its ratio to total nitrogen increased with growth period and stalk position.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- growth period extending and stalk position ascendinge2
- Outcome
- soil nitrogen content and the ratio to total nitrogene2
- Direction
- increasede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue-Cured Tobacco Plant”
e2“with growth period extending and stalk position ascending, both soil nitrogen content and the ratio to total nitrogen evidently increased”
Claim · model-written summary
Nitrogen fertilizer had little effect on tobacco yield.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- using nitrogen fertilizere3
- Outcome
- increasing yielde3
- Direction
- little effecte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue-Cured Tobacco Plant”
e3“The experiments also indicated that using nitrogen fertilizer had little effect on increasing yield, but remarkably increased nitrogen and nicotine content, and improved the quality of tobacco leaves”
Claim · model-written summary
Nitrogen fertilizer remarkably increased nitrogen and nicotine content of tobacco.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- using nitrogen fertilizere3
- Outcome
- nitrogen and nicotine contente3
- Direction
- remarkably increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue-Cured Tobacco Plant”
e3“The experiments also indicated that using nitrogen fertilizer had little effect on increasing yield, but remarkably increased nitrogen and nicotine content, and improved the quality of tobacco leaves”
Claim · model-written summary
Nitrogen fertilizer improved the quality of tobacco leaves.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- using nitrogen fertilizere3
- Outcome
- quality of tobacco leavese3
- Direction
- improvede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue-Cured Tobacco Plant”
e3“The experiments also indicated that using nitrogen fertilizer had little effect on increasing yield, but remarkably increased nitrogen and nicotine content, and improved the quality of tobacco leaves”
Claim · model-written summary
Nicotine concentrations of upper leaves were too high under excessive soil nitrogen supplement.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- excessive supplement of soil nitrogene4
- Outcome
- nicotine concentrations of upper leavese4
- Direction
- too highe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue-Cured Tobacco Plant”
e4“the nicotine concentrations of upper leaves were too high for the excessive supplement of soil nitrogen”
Claim · model-written summary
Controlling the soil nitrogen supplement on paddy soil in the later growth period is important to improve tobacco leaf quality, especially upper leaves.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- controlling the supplement amount of soil nitrogen on paddy soil in latter period of tobacco growthe5
- Outcome
- quality of tobacco leavese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Flue-Cured Tobacco Plant”
e5“controlling the supplement amount of soil nitrogen on paddy soil in latter period of tobacco growth is important to improve the quality of tobacco leaves, especially to upper leaves”
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