Abstract
Abstract Excessive irrigation can reduce cotton yield, but studies assessing the relative contribution of component physiological processes to yield loss are limited. The objective of the current experiment was to quantify irrigation‐induced yield loss attributable to Intercepted Photosynthetically Active Radiation (IPAR), Radiation Use Efficiency (RUE) and Harvest Index (HI). For three irrigation treatments (well‐watered, over‐irrigated, and dryland) during the 2018 and 2019 growing seasons, biweekly measurements of predawn leaf water potential (Ψ PD ) and light interception were taken along with measurements of biomass, lint yield, fibre quality and harvest index. Irrigation effects on yield were only observed during the 2019 season, and the results showed that Ψ PD remained relatively high in both seasons and was rarely affected by irrigation treatment. A significant reduction in yield was observed for irrigated treatments, despite the dryland producing lower biomass. Any positive effects of IPAR and RUE on lint yield due to excess irrigation were offset by large declines in HI. We conclude that HI was the dominant contributor to yield loss due to excessive irrigation because reduced boll numbers and average boll mass were observed in plots with the greatest total above‐ground biomass.
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Claims 6
Claim · model-written summary
Irrigation effects on cotton yield appeared only in 2019.
- Taxon
- cotton
Gossypium hirsutumt0 - Outcome
- Irrigation effects on yielde0
- Qualifier
- 2019 seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation effects on yield were only observed during the 2019 season”
t0“cotton”
Claim · model-written summary
Predawn leaf water potential remained relatively high in both seasons and was rarely affected by irrigation.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- Ψ PDe0
- Direction
- remained relatively highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ψ PD remained relatively high in both seasons and was rarely affected by irrigation treatment”
t0“cotton”
Claim · model-written summary
Irrigated treatments significantly reduced yield compared with dryland.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- irrigated treatmentse0
- Outcome
- yielde0
- Direction
- reductione0
- Comparator
- drylande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant reduction in yield was observed for irrigated treatments, despite the dryland producing lower biomass.”
t0“cotton”
Claim · model-written summary
Dryland produced lower biomass than irrigated plots.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- biomasse0
- Direction
- lowere0
- Setting
- drylande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the dryland producing lower biomass”
t0“cotton”
Claim · model-written summary
Positive effects of excess irrigation on intercepted radiation and radiation use efficiency were offset by large harvest-index declines.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- excess irrigatione0
- Outcome
- lint yielde0
- Qualifier
- large declines in HIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Any positive effects of IPAR and RUE on lint yield due to excess irrigation were offset by large declines in HI.”
t0“cotton”
Claim · model-written summary
Reduced boll numbers and average boll mass accompanied the greatest above-ground biomass and explained the harvest-index contribution to yield loss.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- excessive irrigatione0
- Outcome
- yield losse0
- Qualifier
- reduced boll numbers and average boll masse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HI was the dominant contributor to yield loss due to excessive irrigation because reduced boll numbers and average boll mass were observed in plots with the greatest total above‐ground biomass.”
t0“cotton”
The same questions in other papers
irrigation · yield · Gossypium hirsutum (cotton)Positive and negative results
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- positive
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See all 399 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.