Abstract
Thermal defoliation is a potential alternative to chemical defoliation, particularly for organically grown cotton. A two-row prototype thermal defoliation vehicle that forces air at 193 °C through cotton was compared with the application of a chemical defoliant in three field experiments. The thermal and chemical treatments caused >80% leaf mortality within 24 h and 6 d, respectively. Leaf abscission with the chemical treatment was >80% after 6 d, but abscission in the thermal treatment did not exceed 65% even after 13 d. Fiber length uniformity, strength, micronaire, and value, and percentage trash were not affected by thermal defoliation. Staple length was 2.8% less (P < 0.05) in the thermal treatment than in the chemical treatment in one of the three field tests. Regrowth at the base of defoliated cotton plants occurred in both treatments, so total stalk destruction by cultivation or use of herbicides will have to occur as part of boll weevil management or eradication strategies.
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Claims 9
Claim · model-written summary
Thermal defoliation caused more than 80% leaf mortality within 24 h.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- forces air at 193 °C through cottone2
- Outcome
- leaf mortalitye1
- Direction
- increaseinferrede1
- Value
- >80%e1
- Qualifier
- within 24 he1
- Comparator
- chemical defoliante2
- Setting
- three field experimentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“particularly for organically grown cotton”
e1“The thermal and chemical treatments caused >80% leaf mortality within 24 h and 6 d, respectively”
e2“A two-row prototype thermal defoliation vehicle that forces air at 193 °C through cotton was compared with the application of a chemical defoliant in three field experiments”
Claim · model-written summary
Chemical defoliant caused more than 80% leaf mortality within 6 d.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- chemical defoliante2
- Outcome
- leaf mortalitye1
- Direction
- increaseinferrede1
- Value
- >80%e1
- Qualifier
- 6 de1
- Comparator
- thermal defoliation vehiclee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“particularly for organically grown cotton”
e1“The thermal and chemical treatments caused >80% leaf mortality within 24 h and 6 d, respectively”
e2“A two-row prototype thermal defoliation vehicle that forces air at 193 °C through cotton was compared with the application of a chemical defoliant in three field experiments”
Claim · model-written summary
Leaf abscission with the chemical treatment was above 80% after 6 d, higher than with the thermal treatment.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- chemical treatmente3
- Outcome
- Leaf abscissione3
- Direction
- higherinferrede3
- Value
- >80%e3
- Qualifier
- after 6 de3
- Comparator
- thermal treatmente4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“particularly for organically grown cotton”
e3“Leaf abscission with the chemical treatment was >80% after 6 d”
e4“abscission in the thermal treatment did not exceed 65% even after 13 d”
Claim · model-written summary
Abscission in the thermal treatment did not exceed 65% even after 13 d.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- thermal treatmente4
- Outcome
- abscissione4
- Direction
- lowerinferrede4
- Value
- 65%e4
- Qualifier
- even after 13 de4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“particularly for organically grown cotton”
e4“abscission in the thermal treatment did not exceed 65% even after 13 d”
Claim · model-written summary
Thermal defoliation did not affect fiber length uniformity, strength and micronaire.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- thermal defoliatione5
- Outcome
- Fiber length uniformity, strength, micronairee5
- Direction
- no_changeinferrede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“particularly for organically grown cotton”
e5“Fiber length uniformity, strength, micronaire, and value, and percentage trash were not affected by thermal defoliation”
Claim · model-written summary
Thermal defoliation did not affect fiber value and percentage trash.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- thermal defoliatione5
- Outcome
- value, and percentage trashe5
- Direction
- no_changeinferrede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“particularly for organically grown cotton”
e5“Fiber length uniformity, strength, micronaire, and value, and percentage trash were not affected by thermal defoliation”
Claim · model-written summary
Staple length was 2.8% less in the thermal treatment than in the chemical treatment in one of three field tests.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- thermal treatmente6
- Outcome
- Staple lengthe6
- Direction
- lesse6
- Value
- 2.8%e6
- Qualifier
- (P < 0.05)e6
- Comparator
- chemical treatmente6
- Setting
- one of the three field testse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“particularly for organically grown cotton”
e6“Staple length was 2.8% less (P < 0.05) in the thermal treatment than in the chemical treatment in one of the three field tests”
Claim · model-written summary
Regrowth at the base of defoliated cotton plants occurred in both treatments.
- Taxon
- cottonGossypium hirsutume7
- Organ / stage
- base of defoliated cotton plantse7
- Outcome
- Regrowthe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Regrowth at the base of defoliated cotton plants occurred in both treatments”
Claim · model-written summary
Total stalk destruction by cultivation or herbicides will be needed as part of boll weevil management or eradication.
- Taxon
- cottonGossypium hirsutume0
- Interactor
- boll weevil
Anthonomus grandise7pest - Outcome
- total stalk destructione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“particularly for organically grown cotton”
e7“total stalk destruction by cultivation or use of herbicides will have to occur as part of boll weevil management or eradication strategies”
The same questions in other papers
defoliant · pest · Gossypium hirsutum (cotton)Positive and negative results
7 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
6 papers more in this group
See all 10 papers →pruning · quality: grain · Gossypium hirsutum (cotton)Positive and negative results
15 papers in the same direction as this paper · 15 in the opposite direction
- positive
- positive
- positive
27 papers more in this group
See all 31 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.