Abstract
Supplemental irrigation experiments were conducted to determine the effects of variable amounts of water on the yield, quality, maturity, chemical composition and physical characteristics of flue-cured tobacco.Irrigation improved the yield, quality and maturity for four consecutive years, although by a comparatively small amount in one year because of favourable distribution of rainfall. Neither the yield nor the quality was improved by applications of water in excess of optimum amounts. Tobacco irrigated according to time intervals or stages of growth received either too much or too little water. Thornthwaite evapotranspiration estimates and resistance blocks for determining soil moisture were found to be suitable methods for scheduling irrigation.Leaves from irrigated plots contained less total nitrogen, total alkaloids, and petroleum ether extract but more total sugars, potassium, and chlorine than leaves from unirrigated plots. The phosphorus content of the leaf was unaffected by irrigation. Irrigation had little effect on the leaf thickness, length of burn, filling power, and strip yield.
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Claims 9
Claim · model-written summary
Irrigation improved tobacco yield, quality and maturity for four years.
- Taxon
- TOBACCO
Nicotiana tabacumt0 - Treatment
- Irrigatione0
- Outcome
- yield, quality and maturitye0
- Direction
- improvede0
- Value
- four consecutive yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation improved the yield, quality and maturity for four consecutive years”
t0“FLUE-CURED TOBACCO”
Claim · model-written summary
Water above the optimum did not improve yield or quality.
- Taxon
- TOBACCONicotiana tabacumt0
- Treatment
- applications of water in excess of optimum amountse0
- Outcome
- yield nor the qualitye0
- Direction
- Neithere0
- Qualifier
- in excess of optimum amountse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither the yield nor the quality was improved by applications of water in excess of optimum amounts.”
t0“FLUE-CURED TOBACCO”
Claim · model-written summary
Irrigation scheduled by time or growth stage supplied too much or too little water.
- Taxon
- TobaccoNicotiana tabacume0
- Outcome
- too much or too little watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tobacco irrigated according to time intervals or stages of growth received either too much or too little water.”
Claim · model-written summary
Evapotranspiration estimates and resistance blocks were suitable for irrigation scheduling.
- Taxon
- TOBACCONicotiana tabacumt0
- Outcome
- suitable methods for scheduling irrigatione0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thornthwaite evapotranspiration estimates and resistance blocks for determining soil moisture were found to be suitable methods for scheduling irrigation.”
t0“FLUE-CURED TOBACCO”
Claim · model-written summary
Irrigated leaves contained less nitrogen, alkaloids and petroleum ether extract.
- Taxon
- TOBACCONicotiana tabacumt0
- Organ / stage
- Leavese0
- Treatment
- irrigated plotse0
- Outcome
- total nitrogen, total alkaloids, and petroleum ether extracte0
- Direction
- lesse0
- Comparator
- unirrigated plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves from irrigated plots contained less total nitrogen, total alkaloids, and petroleum ether extract but more total sugars, potassium, and chlorine than leaves from unirrigated plots.”
t0“FLUE-CURED TOBACCO”
Claim · model-written summary
Irrigated leaves contained more sugars, potassium and chlorine.
- Taxon
- TOBACCONicotiana tabacumt0
- Organ / stage
- Leavese0
- Treatment
- irrigated plotse0
- Outcome
- total sugars, potassium, and chlorinee0
- Direction
- moree0
- Comparator
- unirrigated plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaves from irrigated plots contained less total nitrogen, total alkaloids, and petroleum ether extract but more total sugars, potassium, and chlorine than leaves from unirrigated plots.”
t0“FLUE-CURED TOBACCO”
Claim · model-written summary
Irrigation did not affect leaf phosphorus content.
- Taxon
- TOBACCONicotiana tabacumt0
- Treatment
- irrigatione0
- Outcome
- phosphorus content of the leafe0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The phosphorus content of the leaf was unaffected by irrigation.”
t0“FLUE-CURED TOBACCO”
Claim · model-written summary
Irrigation had little effect on leaf thickness, burn length and filling power.
- Taxon
- TOBACCONicotiana tabacumt0
- Treatment
- Irrigatione0
- Outcome
- leaf thickness, length of burn, filling powere0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation had little effect on the leaf thickness, length of burn, filling power, and strip yield.”
t0“FLUE-CURED TOBACCO”
Claim · model-written summary
Irrigation had little effect on strip yield.
- Taxon
- TOBACCONicotiana tabacumt0
- Treatment
- Irrigatione0
- Outcome
- strip yielde0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation had little effect on the leaf thickness, length of burn, filling power, and strip yield.”
t0“FLUE-CURED TOBACCO”
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See all 14 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.