Abstract
Fertilizer N excesses may have negative effects on both crop and water quality. To reduce the risk of N excesses it is essential to accurately define fertilizer N rates. The estimate of the most suitable N rate is complicated by the fact that a certain amount of the N taken up by the crop during the growth season is supplied by the soil. The aim of this work was to estimate the amount of N that can become available for plant uptake during the crop growth season. The effects of five N rates (0, 20, 40, 60, and 80 kg N ha −1 ) on production traits of flue‐cured tobacco ( Nicotiana tabacum L.) cv. K326, and on selected items of an N balance applied to the soil–plant system were studied on a loam soil, in 1998 and 1999, at Bovolone (Verona, northern Italy). The fertilizer N rate positively and significantly influenced cured‐leaf yields only in 1999, whereas the time to harvest increased linearly for increasing N rates, in both years (0.25 d on average for every further kg of fertilizer N). The N balance indicated a remarkable reduction of the soil organic N stock and an increase of the soil inorganic N levels throughout the crop growth period. As these changes were both proportional to the fertilizer N rate, the occurrence of a positive priming effect was hypothesized. The formulation of N fertilizer recommendations to farmers should take into account the existence of priming effect phenomena.
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Claims 6
Claim · model-written summary
Fertilizer N rate positively and significantly influenced cured-leaf yields of flue-cured tobacco only in 1999.
- Taxon
- Nicotiana tabacum L.
Nicotiana tabacume2 - Treatment
- fertilizer N ratee1
- Outcome
- cured‐leaf yieldse1
- Direction
- positivelye1
- Qualifier
- only in 1999e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The fertilizer N rate positively and significantly influenced cured‐leaf yields only in 1999”
e2“flue‐cured tobacco ( Nicotiana tabacum L.) cv. K326”
Claim · model-written summary
Time to harvest of flue-cured tobacco increased linearly with increasing N rates in both years, by 0.25 d on average per further kg of fertilizer N.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacume2
- Treatment
- increasing N ratese3
- Outcome
- time to harveste3
- Direction
- increasede3
- Value
- 0.25 de3
- Qualifier
- in both yearse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“flue‐cured tobacco ( Nicotiana tabacum L.) cv. K326”
e3“the time to harvest increased linearly for increasing N rates, in both years (0.25 d on average for every further kg of fertilizer N)”
Claim · model-written summary
Increasing fertilizer N rate was associated with a remarkable reduction of the soil organic N stock in tobacco cropping.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacume2
- Treatment
- fertilizer N ratee5
- Outcome
- soil organic N stocke4
- Direction
- reductione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“flue‐cured tobacco ( Nicotiana tabacum L.) cv. K326”
e4“The N balance indicated a remarkable reduction of the soil organic N stock and an increase of the soil inorganic N levels throughout the crop growth period”
e5“As these changes were both proportional to the fertilizer N rate”
Claim · model-written summary
Increasing fertilizer N rate was associated with an increase of soil inorganic N levels in tobacco cropping.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacume2
- Treatment
- fertilizer N ratee5
- Outcome
- soil inorganic N levelse4
- Direction
- increasee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“flue‐cured tobacco ( Nicotiana tabacum L.) cv. K326”
e4“The N balance indicated a remarkable reduction of the soil organic N stock and an increase of the soil inorganic N levels throughout the crop growth period”
e5“As these changes were both proportional to the fertilizer N rate”
Claim · model-written summary
A positive priming effect of fertilizer N on soil N is hypothesized to occur in tobacco cropping.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacume2
- Treatment
- fertilizer N ratee5
- Outcome
- occurrence of a positive priming effecte6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“flue‐cured tobacco ( Nicotiana tabacum L.) cv. K326”
e5“As these changes were both proportional to the fertilizer N rate”
e6“the occurrence of a positive priming effect was hypothesized”
Claim · model-written summary
The authors recommend that N fertilizer recommendations to farmers take into account priming effect phenomena.
- Taxon
- Nicotiana tabacum L.Nicotiana tabacume2
- Outcome
- formulation of N fertilizer recommendationse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“flue‐cured tobacco ( Nicotiana tabacum L.) cv. K326”
e7“The formulation of N fertilizer recommendations to farmers should take into account the existence of priming effect phenomena”
The same questions in other papers
nitrogen · yield · Nicotiana tabacum (tobacco)Results differ
84 papers in the same direction as this paper · 15 in the opposite direction · 3 reporting no difference from an alternative
- negative
- no effect
- negative
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See all 103 papers →fertilization · yield · Nicotiana tabacum (tobacco)Positive and negative results
186 papers in the same direction as this paper · 24 in the opposite direction · 3 reporting no difference from an alternative
- positive
- negative
- negative
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See all 214 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.