Abstract
Nitrogen fertilizer is essential for the yield and quality of flue-cured tobacco. Honghuadajinyuan (i.e. Hongda) is a special flue-cured tobacco variety in Yunnan, which differs in nitrogen application rates from other varieties. In 2016 and 2017, different nitrogen application rates were established in Yunnan to compare, with other varieties, Hongda’s agronomic, economic, chemical indicators and soil residual nitrogen. As nitrogen fertilizer rate increased, the ratio of fresh weight to dry weight (RFD) and the proportions of inferior tobacco (PIT) initially decreased and then increased in contrast to the proportions of superior tobacco (PST) and average price. Total sugar and reducing sugar contents in flue-cured tobacco leaves decreased as nitrogen fertilizer rate increased, while total nitrogen, nicotine, and protein contents increased. The highest sensory evaluation scores were obtained with 45 and 60 kg N ha−1. Soil nitrate contents increased with increasing nitrogen fertilizer rate and significantly increased when nitrogen application rate exceeded 60 kg N ha−1. A quadratic model was suitable for Hongda’s response to nitrogen fertilizer rate and 60 kg N ha−1 can meet the needs of the growth of this flue-cured tobacco variety.Abbreviations: Hongda: Honghuadajinyuan; RFD: ratio of fresh to dry weight; PIT: proportion of inferior tobacco; PMT: proportion of medium tobacco; PST: proportion of superior tobacco; SPAD: soil and plant analyzer development.
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Claims 15
Claim · model-written summary
With increasing nitrogen rate, ratio of fresh weight to dry weight (RFD) initially decreased and then increased.
- Taxon
- flue-cured tobaccot0
- Treatment
- nitrogen fertilizer ratee0
- Outcome
- ratio of fresh weight to dry weight (RFD)e0
- Direction
- initially decreased and then increasede0
Not reportedComparator
Verbatim
e0“As nitrogen fertilizer rate increased, the ratio of fresh weight to dry weight (RFD) and the proportions of inferior tobacco (PIT) initially decreased and then increased in contrast to the proportions of superior tobacco (PST) and average price”
t0“flue-cured tobacco”
Claim · model-written summary
With increasing nitrogen rate, proportions of inferior tobacco (PIT) initially decreased and then increased.
- Taxon
- flue-cured tobaccot0
- Treatment
- nitrogen fertilizer ratee0
- Outcome
- proportions of inferior tobacco (PIT)e0
- Direction
- initially decreased and then increasede0
Not reportedComparator
Verbatim
e0“As nitrogen fertilizer rate increased, the ratio of fresh weight to dry weight (RFD) and the proportions of inferior tobacco (PIT) initially decreased and then increased in contrast to the proportions of superior tobacco (PST) and average price”
t0“flue-cured tobacco”
Claim · model-written summary
With increasing nitrogen rate, proportions of superior tobacco (PST) initially increased and then decreased, opposite to inferior tobacco.
- Taxon
- flue-cured tobaccot0
- Treatment
- nitrogen fertilizer ratee0
- Outcome
- proportions of superior tobacco (PST)e0
- Qualifier
- in contrast to the proportions of superior tobacco (PST) and average pricee0
Not reportedComparatorDirection
Verbatim
e0“As nitrogen fertilizer rate increased, the ratio of fresh weight to dry weight (RFD) and the proportions of inferior tobacco (PIT) initially decreased and then increased in contrast to the proportions of superior tobacco (PST) and average price”
t0“flue-cured tobacco”
Claim · model-written summary
With increasing nitrogen rate, average price initially increased and then decreased, opposite to inferior tobacco.
- Taxon
- flue-cured tobaccot0
- Treatment
- nitrogen fertilizer ratee0
- Outcome
- average pricee0
- Qualifier
- in contrast to the proportions of superior tobacco (PST) and average pricee0
Not reportedComparatorDirection
Verbatim
e0“As nitrogen fertilizer rate increased, the ratio of fresh weight to dry weight (RFD) and the proportions of inferior tobacco (PIT) initially decreased and then increased in contrast to the proportions of superior tobacco (PST) and average price”
t0“flue-cured tobacco”
Claim · model-written summary
Total sugar content decreased as nitrogen rate increased.
- Taxon
- flue-cured tobaccoe0
- Organ / stage
- leavese0
- Treatment
- nitrogen fertilizer ratee0
- Outcome
- Total sugare0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“Total sugar and reducing sugar contents in flue-cured tobacco leaves decreased as nitrogen fertilizer rate increased, while total nitrogen, nicotine, and protein contents increased”
Claim · model-written summary
reducing sugar content decreased as nitrogen rate increased.
- Taxon
- flue-cured tobaccoe0
- Organ / stage
- leavese0
- Treatment
- nitrogen fertilizer ratee0
- Outcome
- reducing sugare0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“Total sugar and reducing sugar contents in flue-cured tobacco leaves decreased as nitrogen fertilizer rate increased, while total nitrogen, nicotine, and protein contents increased”
Claim · model-written summary
total nitrogen content increased as nitrogen rate increased.
- Taxon
- flue-cured tobaccoe0
- Organ / stage
- leavese0
- Treatment
- nitrogen fertilizer ratee0
- Outcome
- total nitrogene0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Total sugar and reducing sugar contents in flue-cured tobacco leaves decreased as nitrogen fertilizer rate increased, while total nitrogen, nicotine, and protein contents increased”
Claim · model-written summary
nicotine content increased as nitrogen rate increased.
- Taxon
- flue-cured tobaccoe0
- Organ / stage
- leavese0
- Treatment
- nitrogen fertilizer ratee0
- Outcome
- nicotinee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Total sugar and reducing sugar contents in flue-cured tobacco leaves decreased as nitrogen fertilizer rate increased, while total nitrogen, nicotine, and protein contents increased”
Claim · model-written summary
protein content increased as nitrogen rate increased.
- Taxon
- flue-cured tobaccoe0
- Organ / stage
- leavese0
- Treatment
- nitrogen fertilizer ratee0
- Outcome
- proteine0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Total sugar and reducing sugar contents in flue-cured tobacco leaves decreased as nitrogen fertilizer rate increased, while total nitrogen, nicotine, and protein contents increased”
Claim · model-written summary
A nitrogen rate of 45 kg N ha−1 gave the highest sensory scores.
Not reportedComparator
Verbatim
e0“The highest sensory evaluation scores were obtained with 45 and 60 kg N ha−1”
t0“flue-cured tobacco”
Claim · model-written summary
A nitrogen rate of 60 kg N ha−1 gave the highest sensory scores.
- Taxon
- flue-cured tobaccot0
- Treatment
- 60 kg N ha−1e0
- Outcome
- sensory evaluation scorese0
- Direction
- higheste0
Not reportedComparator
Verbatim
e0“The highest sensory evaluation scores were obtained with 45 and 60 kg N ha−1”
t0“flue-cured tobacco”
Claim · model-written summary
Soil nitrate content increased with nitrogen fertilizer rate.
- Taxon
- flue-cured tobaccot0
- Treatment
- nitrogen fertilizer ratee0
- Outcome
- Soil nitrate contentse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Soil nitrate contents increased with increasing nitrogen fertilizer rate and significantly increased when nitrogen application rate exceeded 60 kg N ha−1”
t0“flue-cured tobacco”
Claim · model-written summary
Soil nitrate content increased significantly above 60 kg N ha−1.
- Taxon
- flue-cured tobaccot0
- Treatment
- nitrogen application rate exceeded 60 kg N ha−1e0
- Outcome
- Soil nitrate contentse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Soil nitrate contents increased with increasing nitrogen fertilizer rate and significantly increased when nitrogen application rate exceeded 60 kg N ha−1”
t0“flue-cured tobacco”
Claim · model-written summary
A quadratic model suitably represented Hongda response to nitrogen rate.
Not reportedComparatorValue
Verbatim
e0“A quadratic model was suitable for Hongda’s response to nitrogen fertilizer rate and 60 kg N ha−1 can meet the needs of the growth of this flue-cured tobacco variety”
Claim · model-written summary
The authors concluded that 60 kg N ha−1 meets Hongda growth needs.
Verbatim
e0“A quadratic model was suitable for Hongda’s response to nitrogen fertilizer rate and 60 kg N ha−1 can meet the needs of the growth of this flue-cured tobacco variety”
The same questions in other papers
nitrogen · quality: general · Nicotiana tabacum (tobacco)Positive and negative results
27 papers in the same direction as this paper · 9 in the opposite direction · 2 reporting no difference from an alternative
- no effect
- negative
- no effect
35 papers more in this group
See all 39 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.