Abstract
Abstract Nitrification inhibitors such as dicyandiamide (DCD) may improve N efficiency for cotton ( Gossypium hirsutum L.) grown on sandy Coastal Plain soils. Research has demonstrated that cotton is sensitive to DCD, and field experiments suggest a possible link between cotton response to DCD and rainfall distribution. A green‐house experiment was conducted to investigate the effect of DCD and N source on growth and water relations of cotton on a typical Coastal Plain soil. Cotton (Deltapine 90) was grown in pots containing a Norfolk sandy loam (fine‐loamy, siliceous, thermic, Typic Paleudults). Nitrogen (50 mg kg −1 ) as NaNO 3 or urea, and DCD (0, 2.5, 5, 10, 15, and 20 mg DCD‐N kg −1 ) were applied to the soil at first true leaf. Soil water content, leaf xylem water potential (ψ 1 ), and stomatal conductance were monitored during a 3‐d drying period, commencing at first bloom, following which plants were harvested. Both N source and DCD affected plant growth and water relations, but there were no significant interaction effects. Fertilization with NaNO 3 increased leaf dry weight 9.1% compared with fertilization with urea. Plants fertilized with NaNO 3 depleted soil moisture faster than plants fertilized with urea, resulting in lowered stomatal conductances and more negative ψ 1 throughout the drying period. Dicyandiamide lineraly reduced leaf area and dry weight, and stem dry weight. Dicyandiamide did not affect soil‐water depletion, ψ 1 , or stomatal conductance in the morning. Under more stressful afternoon conditions, DCD, especially at rates ≥10 mg DCD‐N kg −1 , increased stomatal conductance over the range of available soil water. Dicyandiamide‐induced increases in stomatal conductance under conditions of nonlimiting soil water could increase photosynthesis and possibly lint yield. In years when soil water is limiting, however, additional stress from DCD phytotoxicity could result in yield reductions.
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Claims 10
Claim · model-written summary
Nitrogen source and DCD affected cotton growth and water relations without significant interaction.
- Taxon
- cotton
Gossypium hirsutumt0 - Outcome
- plant growth and water relationse0
- Qualifier
- no significant interaction effectse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both N source and DCD affected plant growth and water relations, but there were no significant interaction effects.”
t0“Cotton”
Claim · model-written summary
NaNO3 fertilization increased cotton leaf dry weight by 9.1% relative to urea.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- NaNO 3e0
- Outcome
- leaf dry weighte0
- Direction
- increasede0
- Value
- 9.1%e0
- Comparator
- ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization with NaNO 3 increased leaf dry weight 9.1% compared with fertilization with urea.”
t0“Cotton”
Claim · model-written summary
NaNO3 fertilization accelerated soil moisture depletion relative to urea.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- NaNO 3e0
- Outcome
- soil moisturee0
- Direction
- fastere0
- Comparator
- ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants fertilized with NaNO 3 depleted soil moisture faster than plants fertilized with urea”
t0“Cotton”
Claim · model-written summary
NaNO3 fertilization lowered stomatal conductance during drying relative to urea.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- NaNO 3e0
- Outcome
- stomatal conductancese0
- Direction
- lowerede0
- Qualifier
- throughout the drying periode0
- Comparator
- ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants fertilized with NaNO 3 depleted soil moisture faster than plants fertilized with urea, resulting in lowered stomatal conductances and more negative ψ 1 throughout the drying period.”
t0“Cotton”
Claim · model-written summary
NaNO3 fertilization made leaf xylem water potential more negative throughout drying.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- NaNO 3e0
- Outcome
- ψ 1e0
- Direction
- more negativee0
- Qualifier
- throughout the drying periode0
- Comparator
- ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants fertilized with NaNO 3 depleted soil moisture faster than plants fertilized with urea, resulting in lowered stomatal conductances and more negative ψ 1 throughout the drying period.”
t0“Cotton”
Claim · model-written summary
Dicyandiamide linearly reduced leaf area, leaf dry weight, and stem dry weight.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- Dicyandiamidee0
- Outcome
- leaf area and dry weight, and stem dry weighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dicyandiamide lineraly reduced leaf area and dry weight, and stem dry weight.”
t0“Cotton”
Claim · model-written summary
Dicyandiamide did not affect morning soil-water depletion, water potential, or stomatal conductance.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- Dicyandiamidee0
- Outcome
- soil‐water depletion, ψ 1 , or stomatal conductancee0
- Direction
- did not affecte0
- Qualifier
- in the morninge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dicyandiamide did not affect soil‐water depletion, ψ 1 , or stomatal conductance in the morning.”
t0“Cotton”
Claim · model-written summary
DCD increased afternoon stomatal conductance, especially at rates at or above 10 mg DCD-N kg−1.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- DCDe0
- Outcome
- stomatal conductancee0
- Direction
- increasede0
- Qualifier
- Under more stressful afternoon conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under more stressful afternoon conditions, DCD, especially at rates ≥10 mg DCD‐N kg −1 , increased stomatal conductance over the range of available soil water.”
t0“Cotton”
Claim · model-written summary
The authors suggest DCD-induced conductance increases could raise photosynthesis and perhaps lint yield when soil water is nonlimiting.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- Dicyandiamidee0
- Outcome
- photosynthesis and possibly lint yielde0
- Qualifier
- under conditions of nonlimiting soil watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dicyandiamide‐induced increases in stomatal conductance under conditions of nonlimiting soil water could increase photosynthesis and possibly lint yield.”
t0“Cotton”
Claim · model-written summary
The authors suggest DCD phytotoxicity could reduce yield when soil water is limiting.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- DCDe0
- Outcome
- yield reductionse0
- Qualifier
- when soil water is limitinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In years when soil water is limiting, however, additional stress from DCD phytotoxicity could result in yield reductions.”
t0“Cotton”
The same questions in other papers
nanoparticle · growth · Gossypium hirsutum (cotton)Positive and negative results
17 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
15 papers more in this group
See all 19 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.