Abstract
Irrigation of cotton was scheduled using a minimum three-day irrigation cycle which was adjusted by temperature-time thresholds (TTT). These TTT were measured as the amount of time that canopy temperature exceeded 28 C during one day. The TTT that were tested ranged from 2.5 to 7.0 h in 1991 and from 2 to 8 h in 1992. In both years an increase of 1 h in TTT decreased the number of irrigations by 1.3 for the period day of year (DOY) 184 to DOY 243. Average canopy temperature between DOY 198 and DOY 273 was 1.2 C higher in the 7.5 TTT than in 2.5 TTT in 1991 and in 1992 the 8 TTT treatment was 2.2 C higher than the 2 TTT treatment (averages are based on time when air temperature exceeded 28 C and total radiation exceeded 500 W/m2). The TTT treatments produced consistent differences in irrigation frequency and application amount in both years. Yields were not different among the TTT treatments in either year. In 1991 Verticillium wilt, a severe infestation of aphids, and 26.6 cm of rainfall during July through September reduced yields in all treatments. All irrigated yields were high in 1992 compared to long-term averages in spite of a late planting date. Even a small amount of irrigation in 1992 combined with a full soil water profile prevented significant moisture stress.
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Claims 8
Claim · model-written summary
Each 1 h increase in the temperature-time threshold decreased the number of irrigations by 1.3 in both years.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- an increase of 1 h in TTTe1
- Outcome
- the number of irrigationse1
- Direction
- decreasede1
- Value
- 1.3e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation of cotton was scheduled using a minimum three-day irrigation cycle”
e1“In both years an increase of 1 h in TTT decreased the number of irrigations by 1.3 for the period day of year (DOY) 184 to DOY 243”
Claim · model-written summary
Canopy temperature was 1.2 C higher at the 7.5 TTT than at the 2.5 TTT in 1991.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- 7.5 TTTe2
- Outcome
- Average canopy temperaturee2
- Direction
- highere2
- Value
- 1.2 Ce2
- Comparator
- 2.5 TTTe2
- Setting
- in 1991e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation of cotton was scheduled using a minimum three-day irrigation cycle”
e2“Average canopy temperature between DOY 198 and DOY 273 was 1.2 C higher in the 7.5 TTT than in 2.5 TTT in 1991”
Claim · model-written summary
In 1992 canopy temperature was 2.2 C higher with the 8 TTT treatment than with the 2 TTT treatment.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- 8 TTT treatmente3
- Outcome
- Average canopy temperaturee2
- Direction
- highere3
- Value
- 2.2 Ce3
- Comparator
- 2 TTT treatmente3
- Setting
- in 1992e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation of cotton was scheduled using a minimum three-day irrigation cycle”
e2“Average canopy temperature between DOY 198 and DOY 273 was 1.2 C higher in the 7.5 TTT than in 2.5 TTT in 1991”
e3“in 1992 the 8 TTT treatment was 2.2 C higher than the 2 TTT treatment”
Claim · model-written summary
The TTT treatments produced consistent differences in irrigation frequency and application amount in both years.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- TTT treatmentse4
- Outcome
- irrigation frequency and application amounte4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation of cotton was scheduled using a minimum three-day irrigation cycle”
e4“The TTT treatments produced consistent differences in irrigation frequency and application amount in both years”
Claim · model-written summary
Yields did not differ among the TTT treatments in either year.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- TTT treatmentse5
- Outcome
- Yieldse5
- Direction
- not differente5
- Comparator
- among the TTT treatmentse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation of cotton was scheduled using a minimum three-day irrigation cycle”
e5“Yields were not different among the TTT treatments in either year”
Claim · model-written summary
Verticillium wilt and a severe aphid infestation reduced cotton yields in all treatments in 1991.
- Taxon
- cottonGossypium hirsutume0
- Interactor
- Verticillium wilte6pathogen
- Second interactor
- aphidsAphidomorphae6pest
- Outcome
- yieldse6
- Direction
- reducede6
- Qualifier
- 26.6 cm of rainfall during July through Septembere6
- Setting
- 1991e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation of cotton was scheduled using a minimum three-day irrigation cycle”
e6“In 1991 Verticillium wilt, a severe infestation of aphids, and 26.6 cm of rainfall during July through September reduced yields in all treatments”
Claim · model-written summary
All irrigated cotton yields were high in 1992 compared with long-term averages.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- All irrigated yieldse7
- Qualifier
- in spite of a late planting datee7
- Comparator
- long-term averagese7
- Setting
- in 1992e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation of cotton was scheduled using a minimum three-day irrigation cycle”
e7“All irrigated yields were high in 1992 compared to long-term averages in spite of a late planting date”
Claim · model-written summary
A small amount of irrigation with a full soil water profile prevented significant moisture stress in 1992.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- a small amount of irrigation in 1992 combined with a full soil water profilee7
- Outcome
- significant moisture stresse7
- Direction
- preventede7
- Setting
- in 1992e7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation of cotton was scheduled using a minimum three-day irrigation cycle”
e7“Even a small amount of irrigation in 1992 combined with a full soil water profile prevented significant moisture stress”
The same questions in other papers
irrigation · soil: physics · Gossypium hirsutum (cotton)Positive and negative results
18 papers in the same direction as this paper · 4 in the opposite direction
- negative
- no effect
- negative
19 papers more in this group
See all 23 papers →soil water · soil: physics · Gossypium hirsutum (cotton)Results agree
1 paper in the same direction as this paper
- positive
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.