Abstract
Abstract Field experiments were conducted in 1973-1975 at Katerini, Greece, to determine the effects of nitrogen and potassium fertilization rates on the yield, value and chemical composition of Samsun tobacco (Nicotiana tabacum L. (cv. Samsun 53)) leaves. Nitrogen was applied at rates of 20, 40, 60 and 80 kg/ha and potassium at rates of 30, 60, 90 and 120 kg/ha. Leaf yield increased significantly as applied nitrogen increased from 20 to 40 kg/ha, whereas further increase of nitrogen to 60 or to 80 kg/ha resulted in an insignificant increase in leaf yield. There was a tendency for value/ha of tobacco to increase as nitrogen rate increased from 20 to 40 kg/ha. A further increase of nitrogen to 60 and 80 kg/ha tended to decrease the value of tobacco. Generally, burning capacity and percentage of total alkaloids, total nitrogen, calcium and magnesium increased significantly as applied nitrogen increased. Percentage leaf potassium tended to increase as rate of nitrogen increased. Leaf yield and value/ha tended to increase as applied potassium increased from 30 to 60 kg/ha, beyond which no further increase occurred. Burning capacity and concentration of leaf potassium tended to increase, whereas the percentage of total alkaloids and magnesium tended to decrease as the rate of potassium increased. Concentrations of nitrogen and calcium were not affected by potassium rates. Generally, for production of a good yield and quality of Samsun tobacco in soils similar to that of Katerini, Greece, the rate of applied nitrogen should be higher than 20 kg/ha but lower than 60 kg/ha, while the rate of applied potassium should be above 30 kg/ha and up to 90 kg/ha.
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Claims 20
Claim · model-written summary
Leaf yield increased significantly as nitrogen rose from 20 to 40 kg/ha.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Treatment
- applied nitrogene0
- Outcome
- Leaf yielde0
- Direction
- increasede0
- Comparator
- 20e0
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf yield increased significantly as applied nitrogen increased from 20 to 40 kg/ha”
t0“Tobacco”
Claim · model-written summary
Further nitrogen increases gave an insignificant leaf yield increase.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- nitrogen to 60 or to 80 kg/hae0
- Outcome
- leaf yielde0
- Direction
- increasee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“further increase of nitrogen to 60 or to 80 kg/ha resulted in an insignificant increase in leaf yield”
t0“Tobacco”
Claim · model-written summary
Tobacco value per hectare tended to increase between 20 and 40 kg/ha nitrogen.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- nitrogen ratee0
- Outcome
- value/ha of tobaccoe0
- Direction
- increasee0
- Comparator
- 20e0
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“value/ha of tobacco to increase as nitrogen rate increased from 20 to 40 kg/ha”
t0“Tobacco”
Claim · model-written summary
Further nitrogen increase tended to decrease tobacco value.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- nitrogen to 60 and 80 kg/hae0
- Outcome
- value of tobaccoe0
- Direction
- decreasee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A further increase of nitrogen to 60 and 80 kg/ha tended to decrease the value of tobacco”
t0“Tobacco”
Claim · model-written summary
burning capacity increased significantly as nitrogen increased.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- applied nitrogene0
- Outcome
- burning capacitye0
- Direction
- increasede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“burning capacity and percentage of total alkaloids, total nitrogen, calcium and magnesium increased significantly as applied nitrogen increased”
t0“Tobacco”
Claim · model-written summary
total alkaloids increased significantly as nitrogen increased.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- applied nitrogene0
- Outcome
- total alkaloidse0
- Direction
- increasede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“burning capacity and percentage of total alkaloids, total nitrogen, calcium and magnesium increased significantly as applied nitrogen increased”
t0“Tobacco”
Claim · model-written summary
total nitrogen increased significantly as nitrogen increased.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- applied nitrogene0
- Outcome
- total nitrogene0
- Direction
- increasede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“burning capacity and percentage of total alkaloids, total nitrogen, calcium and magnesium increased significantly as applied nitrogen increased”
t0“Tobacco”
Claim · model-written summary
calcium increased significantly as nitrogen increased.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- applied nitrogene0
- Outcome
- calciume0
- Direction
- increasede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“burning capacity and percentage of total alkaloids, total nitrogen, calcium and magnesium increased significantly as applied nitrogen increased”
t0“Tobacco”
Claim · model-written summary
magnesium increased significantly as nitrogen increased.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- applied nitrogene0
- Outcome
- magnesiume0
- Direction
- increasede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“burning capacity and percentage of total alkaloids, total nitrogen, calcium and magnesium increased significantly as applied nitrogen increased”
t0“Tobacco”
Claim · model-written summary
Leaf potassium percentage tended to increase with nitrogen rate.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- nitrogene0
- Outcome
- leaf potassiume0
- Direction
- increasee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Percentage leaf potassium tended to increase as rate of nitrogen increased”
t0“Tobacco”
Claim · model-written summary
Leaf yield tended to increase as potassium rose from 30 to 60 kg/ha.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- applied potassiume0
- Outcome
- Leaf yielde0
- Direction
- increasee0
- Comparator
- 30e0
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf yield and value/ha tended to increase as applied potassium increased from 30 to 60 kg/ha”
t0“Tobacco”
Claim · model-written summary
value/ha tended to increase as potassium rose from 30 to 60 kg/ha.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- applied potassiume0
- Outcome
- value/hae0
- Direction
- increasee0
- Comparator
- 30e0
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf yield and value/ha tended to increase as applied potassium increased from 30 to 60 kg/ha”
t0“Tobacco”
Claim · model-written summary
Yield and value did not further increase beyond 60 kg/ha potassium.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- increasee0
- Direction
- no further increasee0
Not reportedTreatmentComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“beyond which no further increase occurred”
t0“Tobacco”
Claim · model-written summary
Burning capacity tended to increase with potassium rate.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- potassiume0
- Outcome
- Burning capacitye0
- Direction
- increasee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Burning capacity and concentration of leaf potassium tended to increase, whereas the percentage of total alkaloids and magnesium tended to decrease as the rate of potassium increased”
t0“Tobacco”
Claim · model-written summary
leaf potassium tended to increase with potassium rate.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- potassiume0
- Outcome
- leaf potassiume0
- Direction
- increasee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Burning capacity and concentration of leaf potassium tended to increase, whereas the percentage of total alkaloids and magnesium tended to decrease as the rate of potassium increased”
t0“Tobacco”
Claim · model-written summary
total alkaloids tended to decrease with potassium rate.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- potassiume0
- Outcome
- total alkaloidse0
- Direction
- decreasee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Burning capacity and concentration of leaf potassium tended to increase, whereas the percentage of total alkaloids and magnesium tended to decrease as the rate of potassium increased”
t0“Tobacco”
Claim · model-written summary
magnesium tended to decrease with potassium rate.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- potassiume0
- Outcome
- magnesiume0
- Direction
- decreasee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Burning capacity and concentration of leaf potassium tended to increase, whereas the percentage of total alkaloids and magnesium tended to decrease as the rate of potassium increased”
t0“Tobacco”
Claim · model-written summary
nitrogen concentration was unaffected by potassium rates.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- potassium ratese0
- Outcome
- nitrogene0
- Direction
- not affectede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of nitrogen and calcium were not affected by potassium rates”
t0“Tobacco”
Claim · model-written summary
calcium concentration was unaffected by potassium rates.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- potassium ratese0
- Outcome
- calciume0
- Direction
- not affectede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Concentrations of nitrogen and calcium were not affected by potassium rates”
t0“Tobacco”
Claim · model-written summary
For good Samsun tobacco yield and quality in similar soils, nitrogen should exceed 20 but remain below 60 kg/ha and potassium should exceed 30 and reach at most 90 kg/ha.
Verbatim
e0“Generally, for production of a good yield and quality of Samsun tobacco in soils similar to that of Katerini, Greece, the rate of applied nitrogen should be higher than 20 kg/ha but lower than 60 kg/ha, while the rate of applied potassium should be above 30 kg/ha and up to 90 kg/ha”
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