Abstract
Abstract The results of a two-year research project into burley tobacco are reported and discussed. Three irrigation levels (40, 80 and 120% restitution of evapotranspiration (ET)) were factorially combined with four levels of nitrogen fertilisation (0, 80, 160 and 240 kg ha). Leaf area, leaf and stem dry matter and root development were measured. We monitored the water status of the 0-90 cm soil layer, the plants and stomatal resistance. Relations were also studied between leaf turgor pressure and plant growth, between the irrigation regime and plant water status, and between root and shoot development. Finally, water use efficiency (WUE) and quality and quantity of cured leaves yields were evaluated. Nitrogen fertilisation did not affect plant water status, although it promoted plant growth, both in terms of leaf area and leaf and stem dry matter, and induced a yield increase in quantity and quality. Our trial showed little interaction between nitrogen fertilization level and water regime. Under such agronomic condition, the margins for increasing plant growth with nitrogen fertilization are limited, which is why application of nitrogen rates in excess of 160 kg haappear inadvisable. The difference in irrigation volumes led to a different soil water content which affected plant water status, stomatal functioning, plant growth, both in the roots and shoots, yield and quality of the cured leaves. The latter did not vary with the increase in water volume, while yield increased. Water use efficiency increased as the irrigation volume decreased and varied during the cropping cycle, increasing until early bloom, then decreasing. Relations between leaf turgor pressure and plant growth highlighted the different response of plants subjected to water stress compared with non-stressed plants.
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Claims 12
Claim · model-written summary
Nitrogen fertilisation did not affect plant water status.
- Taxon
- Burley Tobaccot0
- Treatment
- Nitrogen fertilisatione0
- Outcome
- plant water statuse0
- Direction
- did not affecte0
Not reportedComparator
Verbatim
e0“Nitrogen fertilisation did not affect plant water status, although it promoted plant growth, both in terms of leaf area and leaf and stem dry matter, and induced a yield increase in quantity and quality.”
t0“Burley Tobacco”
Claim · model-written summary
Nitrogen fertilisation promoted leaf area and leaf and stem dry matter.
- Taxon
- Burley Tobaccot0
- Treatment
- Nitrogen fertilisatione0
- Outcome
- leaf area and leaf and stem dry mattere0
- Direction
- promotede0
Not reportedComparator
Verbatim
e0“Nitrogen fertilisation did not affect plant water status, although it promoted plant growth, both in terms of leaf area and leaf and stem dry matter, and induced a yield increase in quantity and quality.”
t0“Burley Tobacco”
Claim · model-written summary
Nitrogen fertilisation increased the quantity and quality of yield.
Not reportedComparator
Verbatim
e0“Nitrogen fertilisation did not affect plant water status, although it promoted plant growth, both in terms of leaf area and leaf and stem dry matter, and induced a yield increase in quantity and quality.”
t0“Burley Tobacco”
Claim · model-written summary
Nitrogen level interacted little with water regime.
Verbatim
e0“Our trial showed little interaction between nitrogen fertilization level and water regime.”
t0“Burley Tobacco”
Claim · model-written summary
Nitrogen rates above 160 kg ha are inadvisable under the studied conditions.
Verbatim
e0“application of nitrogen rates in excess of 160 kg haappear inadvisable”
t0“Burley Tobacco”
Claim · model-written summary
Irrigation volumes altered soil water content and plant water status.
- Taxon
- Burley Tobaccot0
- Treatment
- irrigation volumese0
- Outcome
- soil water content which affected plant water statuse0
- Direction
- differente0
Not reportedComparator
Verbatim
e0“The difference in irrigation volumes led to a different soil water content which affected plant water status, stomatal functioning, plant growth, both in the roots and shoots, yield and quality of the cured leaves.”
t0“Burley Tobacco”
Claim · model-written summary
Irrigation volumes affected stomatal functioning.
Not reportedComparatorDirection
Verbatim
e0“The difference in irrigation volumes led to a different soil water content which affected plant water status, stomatal functioning, plant growth, both in the roots and shoots, yield and quality of the cured leaves.”
t0“Burley Tobacco”
Claim · model-written summary
Irrigation volumes affected root and shoot growth.
- Taxon
- Burley Tobaccot0
- Treatment
- irrigation volumese0
- Outcome
- plant growth, both in the roots and shootse0
Not reportedComparatorDirection
Verbatim
e0“The difference in irrigation volumes led to a different soil water content which affected plant water status, stomatal functioning, plant growth, both in the roots and shoots, yield and quality of the cured leaves.”
t0“Burley Tobacco”
Claim · model-written summary
Increasing irrigation volume increased yield.
Not reportedComparator
Verbatim
e0“The latter did not vary with the increase in water volume, while yield increased.”
t0“Burley Tobacco”
Claim · model-written summary
Cured leaf quality did not vary with increased water volume.
Not reportedComparator
Verbatim
e0“The latter did not vary with the increase in water volume, while yield increased.”
t0“Burley Tobacco”
Claim · model-written summary
Water use efficiency increased as irrigation volume decreased.
- Taxon
- Burley Tobaccot0
- Treatment
- irrigation volume decreasede0
- Outcome
- Water use efficiencye0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Water use efficiency increased as the irrigation volume decreased and varied during the cropping cycle, increasing until early bloom, then decreasing.”
t0“Burley Tobacco”
Claim · model-written summary
Water use efficiency rose until early bloom, then declined.
- Taxon
- Burley Tobaccot0
- Treatment
- cropping cyclee0
- Outcome
- Water use efficiencye0
- Direction
- increasing until early bloom, then decreasinge0
Not reportedComparator
Verbatim
e0“Water use efficiency increased as the irrigation volume decreased and varied during the cropping cycle, increasing until early bloom, then decreasing.”
t0“Burley Tobacco”
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