Abstract
Abstract In the semiarid San Joaquin Valley of California, about 90% of the evapotranspiration needs for nonstressed cotton ( Gossypium hirsutum L.) are met by irrigation. Soil water‐retention characteristics determine the frequency with which irrigations must be made to replenish depleted soil water during the growing season. Comparatively little attention has been given to using this soil parameter in a predictive sense to help define the correct timing of a final irrigation which may save water and hasten maturity without reducing yield. Studies were conducted in the San Joaquin Valley, on two soils that have a broad difference in water retention ability, to determine the best irrigation termination date for cotton. A multiple‐regression model that included time of irrigation termination and water‐retention capacity of soil as independent variables was used to describe the influence of these variables on cotton production potential (R 2 = 0.71”*). Prepared from the function was a graphic relation illustrating an irrigation termination time that allows a 98% relative yield on the basis of the amount of available water the soil can retain. An optimum irrigation termination time was 28 days later for the low water‐retaining soil of the study than for the high water‐retaining soil. Correct timing of a final irrigation saved water and hastened the opening of mature bolls without harm to lint yield or quality.
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Claims 6
Claim · model-written summary
The multiple-regression model that included termination time and soil water-retention capacity described cotton production potential (R 2 = 0.71).
- Taxon
- cotton
Gossypium hirsutume0 - Outcome
- cotton production potentiale1
- Value
- R 2 = 0.71e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the semiarid San Joaquin Valley of California, about 90% of the evapotranspiration needs for nonstressed cotton”
e1“cotton production potential (R 2 = 0.71”
Claim · model-written summary
A graphic relation shows an irrigation termination time that allows a 98% relative yield given the soil's available water.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- irrigation termination timee2
- Outcome
- relative yielde2
- Value
- 98%e2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the semiarid San Joaquin Valley of California, about 90% of the evapotranspiration needs for nonstressed cotton”
e2“an irrigation termination time that allows a 98% relative yield on the basis of the amount of available water the soil can retain”
Claim · model-written summary
The optimum irrigation termination time was 28 days later for the low water-retaining soil than for the high water-retaining soil.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- optimum irrigation termination timee3
- Direction
- latere3
- Value
- 28 dayse3
- Comparator
- high watere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the semiarid San Joaquin Valley of California, about 90% of the evapotranspiration needs for nonstressed cotton”
e3“An optimum irrigation termination time was 28 days later for the low water”
e4“than for the high water”
Claim · model-written summary
Correct timing of a final irrigation saved water in cotton.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- Correct timing of a final irrigatione5
- Outcome
- saved watere5
- Direction
- savede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the semiarid San Joaquin Valley of California, about 90% of the evapotranspiration needs for nonstressed cotton”
e5“Correct timing of a final irrigation saved water and hastened the opening of mature bolls without harm to lint yield or quality”
Claim · model-written summary
Correct timing of a final irrigation hastened the opening of mature bolls in cotton.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- Correct timing of a final irrigatione5
- Outcome
- opening of mature bollse5
- Direction
- hastenede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the semiarid San Joaquin Valley of California, about 90% of the evapotranspiration needs for nonstressed cotton”
e5“Correct timing of a final irrigation saved water and hastened the opening of mature bolls without harm to lint yield or quality”
Claim · model-written summary
Correct timing of a final irrigation did not harm lint yield or quality in cotton.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- Correct timing of a final irrigatione5
- Outcome
- lint yield or qualitye5
- Direction
- without harme5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the semiarid San Joaquin Valley of California, about 90% of the evapotranspiration needs for nonstressed cotton”
e5“Correct timing of a final irrigation saved water and hastened the opening of mature bolls without harm to lint yield or quality”
The same questions in other papers
irrigation · quality: grain · Gossypium hirsutum (cotton)Positive and negative results
60 papers in the same direction as this paper · 73 in the opposite direction
- positive
- positive
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See all 134 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.