Abstract
Abstract Damage, appearing to result from irrigation water, reduced the value of cigar wrapper tobacco ( Nicotiana tabacum L.) from about $4.00 per pound to 0.25 in 1969. Dark leaf tips and dark spots over the entire leaf rendered damaged leaves unfit for wrapper use. Leaf analysis indicated that Fe and Mn were associated with the dark coloration. A study was made in 1970 to determine the effect of Fe in irrigation water on quality of cured wrapper tobacco leaves and to find a potential source of Fe contamination of irrigation ponds. Two forms of Fe were added to irrigation water applied to field plots, and Fe content of leaves, leaf quality, and leaf tensile strength were used to evaluate the effects. Soil and organic material were collected from a shallow area of a “problem” pond, after it had been drained, for use in laboratory studies. Damaged tobacco, similar to that observed in commercial fields, was produced in field plots in 1970 when Fe was added to the irrigation water. Laboratory incubation studies showed that pond sediments were a potential source of Fe buildup in irrigation water. Leaf strength decreased with increasing content of Fe in the tissue. A visible coating was produced on green leaves in the greenhouse when 5 and 10 ppm Fe in water were sprayed on the plants.
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Claims 7
Claim · model-written summary
Apparent irrigation damage reduced wrapper tobacco value from about $4.00 per pound to 0.25.
Verbatim
e0“Damage, appearing to result from irrigation water, reduced the value of cigar wrapper tobacco ( Nicotiana tabacum L.) from about $4.00 per pound to 0.25 in 1969”
Claim · model-written summary
Dark leaf tips and spots made damaged leaves unfit for wrapper use.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Organ / stage
- leafe0
- Outcome
- unfit for wrapper usee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dark leaf tips and dark spots over the entire leaf rendered damaged leaves unfit for wrapper use”
t0“Tobacco”
Claim · model-written summary
Leaf Fe and Mn were associated with dark coloration.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- Leafe0
- Compound
- Fe and Mne0
- Outcome
- dark coloratione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf analysis indicated that Fe and Mn were associated with the dark coloration”
t0“Tobacco”
Claim · model-written summary
Adding Fe to irrigation water produced damaged tobacco in field plots.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- Fe was added to the irrigation watere0
- Outcome
- Damaged tobaccoe0
- Setting
- field plotse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Damaged tobacco, similar to that observed in commercial fields, was produced in field plots in 1970 when Fe was added to the irrigation water”
Claim · model-written summary
Pond sediment incubation showed a potential source of Fe buildup in irrigation water.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- Fe buildup in irrigation watere0
- Qualifier
- potential sourcee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Laboratory incubation studies showed that pond sediments were a potential source of Fe buildup in irrigation water”
t0“Tobacco”
Claim · model-written summary
Leaf strength decreased as tissue Fe content increased.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- Leafe0
- Compound
- Fee0
- Outcome
- Leaf strengthe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf strength decreased with increasing content of Fe in the tissue”
t0“Tobacco”
Claim · model-written summary
Spraying water containing 5 and 10 ppm Fe produced a visible coating on green leaves.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- green leavese0
- Treatment
- 5 and 10 ppm Fe in water were sprayede0
- Outcome
- visible coatinge0
- Setting
- greenhousee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A visible coating was produced on green leaves in the greenhouse when 5 and 10 ppm Fe in water were sprayed on the plants”
t0“Tobacco”
The same questions in other papers
irrigation · organism · Nicotiana tabacum (tobacco)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 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.