Abstract
Abstract Nitrogen (N) fertilizer recommendations for rainfed cotton ( Gossypium hirsutum L.) in Florida have remained static at 67 kg N ha −1 since 1981. A study conducted at the West Florida Research and Education Center in Jay, FL, in 2022 and 2023, evaluated the response of cotton (cv. DP‐2038) to six N rates (0, 50, 101, 151, 202, and 252 kg ha −1 ), using a randomized complete block design with four replications. Total rainfall during growing season was 923 mm in 2022 and 710 mm in 2023. Results show petiole nitrate N concentration of 5050–9700 mg kg −1 at bloom and 363–1138 mg kg −1 at 4 weeks after bloom is sufficient for rainfed cotton in Florida. Aboveground biomass achieved with 252 kg N ha −1 was 25%–92% higher than with other N rates. The greatest seed cotton (3761 kg ha −1 ) and lint yield (1817 kg ha −1 ) were recorded with 151 kg N ha −1 , but this was statistically similar ( p > 0.05) to 252, 202, and 101 kg N ha −1 . Lint turnout decreased with increasing N rate, with maximum in the unfertilized control and minimum with 252 kg N ha −1 . Fertilizer N use efficiency (NUE) and internal NUE decreased by 76% and 53%, respectively, with an increase in N rate from 50 to 252 kg ha −1 . The best fit linear plateau model indicated an agronomic optimum rate of 127 kg N ha −1 . These results show the need to revise N recommendations for rainfed cotton in Florida to maximize yield and economic returns while promoting sustainable agricultural practices.
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Claims 13
Claim · model-written summary
Petiole nitrate concentrations of 5050–9700 mg kg −1 at bloom were sufficient.
- Taxon
- cotton
Gossypium hirsutume0 - Organ / stage
- at bloome0
- Outcome
- petiole nitrate N concentratione0
- Value
- 5050–9700 mg kg −1e0
- Setting
- Floridae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“petiole nitrate N concentration of 5050–9700 mg kg −1 at bloom and 363–1138 mg kg −1 at 4 weeks after bloom is sufficient for rainfed cotton in Florida”
Claim · model-written summary
Petiole nitrate concentrations of 363–1138 mg kg −1 four weeks after bloom were sufficient.
- Taxon
- cottonGossypium hirsutume0
- Organ / stage
- 4 weeks after bloome0
- Outcome
- petiole nitrate N concentratione0
- Value
- 363–1138 mg kg −1e0
- Setting
- Floridae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“petiole nitrate N concentration of 5050–9700 mg kg −1 at bloom and 363–1138 mg kg −1 at 4 weeks after bloom is sufficient for rainfed cotton in Florida”
Claim · model-written summary
Aboveground biomass at 252 kg N ha −1 was 25%–92% higher than at other rates.
- Treatment
- 252 kg N ha −1e0
- Outcome
- Aboveground biomasse0
- Direction
- highere0
- Value
- 25%–92%e0
- Comparator
- other N ratese0
Not reportedTaxon
Verbatim
e0“Aboveground biomass achieved with 252 kg N ha −1 was 25%–92% higher than with other N rates”
Claim · model-written summary
The greatest seed cotton yield was 3761 kg ha −1 at 151 kg N ha −1.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- 151 kg N ha −1e0
- Outcome
- seed cottone0
- Direction
- greateste0
- Value
- 3761 kg ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The greatest seed cotton (3761 kg ha −1 ) and lint yield (1817 kg ha −1 ) were recorded with 151 kg N ha −1”
Claim · model-written summary
The greatest lint yield was 1817 kg ha −1 at 151 kg N ha −1.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- 151 kg N ha −1e0
- Outcome
- lint yielde0
- Direction
- greateste0
- Value
- 1817 kg ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The greatest seed cotton (3761 kg ha −1 ) and lint yield (1817 kg ha −1 ) were recorded with 151 kg N ha −1”
Claim · model-written summary
Yield at 151 kg N ha −1 was statistically similar to rates of 101, 202 and 252 kg N ha −1.
- Outcome
- statistically similare0
- Direction
- statistically similare0
- Comparator
- 252, 202, and 101 kg N ha −1e0
Not reportedTaxonTreatment
Verbatim
e0“this was statistically similar ( p > 0.05) to 252, 202, and 101 kg N ha −1”
Claim · model-written summary
Lint turnout declined as nitrogen rate increased.
Not reportedTaxonSetting
Verbatim
e0“Lint turnout decreased with increasing N rate”
Claim · model-written summary
Lint turnout was greatest in the unfertilized control.
Not reportedTaxon
Verbatim
e0“with maximum in the unfertilized control and minimum with 252 kg N ha −1”
Claim · model-written summary
Lint turnout was lowest at 252 kg N ha −1.
Not reportedTaxon
Verbatim
e0“minimum with 252 kg N ha −1”
Claim · model-written summary
Fertilizer nitrogen use efficiency decreased 76% from 50 to 252 kg ha −1.
- Treatment
- N ratee0
- Outcome
- Fertilizer N use efficiency (NUE)e0
- Direction
- decreasede0
- Value
- 76%e0
- Qualifier
- from 50 to 252 kg ha −1e0
Not reportedTaxonSetting
Verbatim
e0“Fertilizer N use efficiency (NUE) and internal NUE decreased by 76% and 53%, respectively, with an increase in N rate from 50 to 252 kg ha −1”
Claim · model-written summary
Internal nitrogen use efficiency decreased 53% from 50 to 252 kg ha −1.
- Treatment
- N ratee0
- Outcome
- internal NUEe0
- Direction
- decreasede0
- Value
- 53%e0
- Qualifier
- from 50 to 252 kg ha −1e0
Not reportedTaxonSetting
Verbatim
e0“Fertilizer N use efficiency (NUE) and internal NUE decreased by 76% and 53%, respectively, with an increase in N rate from 50 to 252 kg ha −1”
Claim · model-written summary
A linear plateau model indicated an agronomic optimum rate of 127 kg N ha −1.
Not reportedTaxon
Verbatim
e0“The best fit linear plateau model indicated an agronomic optimum rate of 127 kg N ha −1”
Claim · model-written summary
The authors recommend revising nitrogen recommendations for rainfed cotton in Florida.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- revise N recommendationse0
- Setting
- Floridae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results show the need to revise N recommendations for rainfed cotton in Florida to maximize yield and economic returns while promoting sustainable agricultural practices”
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128 papers in the same direction as this paper · 21 in the opposite direction · 3 reporting no difference from an alternative
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See all 153 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.