Abstract
Abstract Management of N nutrition of cotton ( Gossypium hirsutum L.) is one of the most critical aspects of successful cotton production, but growth and yield responses of individual cotton cultivars to N fertilization is relatively unknown. The objective of this research was to evaluate the responses of three cotton cultivars (Arkot 518, Stoneville 453, and Deltapine 90) to soil‐applied N fertilization rates. The study was conducted for 3 yr on a Hebert silt loam soil (fine‐silty, mixed, thermic Aeric Ochraqualf). Few significant (ɑ = 0.05) cultivar × N rate interaction differences were found, although main effects of the N treatments and the cultivars were evident. The most pronounced responses of the cotton were found as an effect of the N‐fertilization treatments. Nitrogen rates in excess of 112 kg N ha −1 did not significantly increase seed cotton yields in any year of the study. The mean yield of the cultivars among N rates was significantly different in only one year of the study. Earliness of the cotton was reduced by increasing N rate, as indicated by significant differences in nodes above white flower (NAWF) measurements. Significant differences were also found in the NAWF measurements for the cultivars, thereby inferring maturity differences among the cultivars tested. Of the cultivars evaluated, Arkot 518 was earliest, followed by Stoneville 453, and then Deltapine 90. Significant interactions of cultivar and N rate were found only in three dates of NAWF (1991), and one date of petiole NO ‐ 3 ‐N content (1990). Soil samples taken after 3 yr of continuous fertilization treatments showed a significant NO ‐ 3 ‐N accumulation at the 15‐ to 45‐cm depth only in plots treated with 224 kg N ha −1 .
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Claims 9
Claim · model-written summary
Few cultivar by nitrogen rate interaction differences were significant.
- Taxon
- cotton
Gossypium hirsutumt0 - Outcome
- cultivar × N rate interaction differencese0
- Qualifier
- Few significante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Few significant (ɑ = 0.05) cultivar × N rate interaction differences were found, although main effects of the N treatments and the cultivars were evident.”
t0“Cotton”
Claim · model-written summary
Nitrogen rates above 112 kg N ha −1 did not significantly increase seed cotton yield in any study year.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- Nitrogen rates in excess of 112 kg N ha −1e0
- Outcome
- seed cotton yieldse0
- Direction
- did not significantly increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen rates in excess of 112 kg N ha −1 did not significantly increase seed cotton yields in any year of the study.”
Claim · model-written summary
Mean cultivar yield differed significantly among cultivars in only one study year.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- mean yielde0
- Qualifier
- only one year of the studye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean yield of the cultivars among N rates was significantly different in only one year of the study.”
t0“Cotton”
Claim · model-written summary
Increasing nitrogen rate reduced cotton earliness as indicated by nodes above white flower.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- increasing N ratee0
- Outcome
- Earlinesse0
- Direction
- reducede0
- Qualifier
- nodes above white flower (NAWF)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Earliness of the cotton was reduced by increasing N rate, as indicated by significant differences in nodes above white flower (NAWF) measurements.”
Claim · model-written summary
Cultivars differed significantly in nodes above white flower.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- NAWF measurementse0
- Qualifier
- maturity differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant differences were also found in the NAWF measurements for the cultivars, thereby inferring maturity differences among the cultivars tested.”
t0“Cotton”
Claim · model-written summary
Arkot 518 was the earliest cotton cultivar, followed by Stoneville 453 and Deltapine 90.
- Taxon
- cottonGossypium hirsutumt0
- Material
- Arkot 518e0
- Outcome
- earlieste0
- Direction
- earlieste0
- Qualifier
- Deltapine 90e0
- Comparator
- Stoneville 453e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Of the cultivars evaluated, Arkot 518 was earliest, followed by Stoneville 453, and then Deltapine 90.”
t0“Cotton”
Claim · model-written summary
Cultivar and nitrogen rate interacted significantly for nodes above white flower on three dates in 1991.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- NAWFe0
- Value
- three datese0
- Qualifier
- 1991e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant interactions of cultivar and N rate were found only in three dates of NAWF (1991), and one date of petiole NO ‐ 3 ‐N content (1990).”
t0“Cotton”
Claim · model-written summary
Cultivar and nitrogen rate interacted significantly for petiole nitrate nitrogen content on one date in 1990.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- petiole NO ‐ 3 ‐N contente0
- Value
- one datee0
- Qualifier
- 1990e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant interactions of cultivar and N rate were found only in three dates of NAWF (1991), and one date of petiole NO ‐ 3 ‐N content (1990).”
t0“Cotton”
Claim · model-written summary
Only plots receiving 224 kg N ha −1 had significant soil nitrate accumulation at 15 to 45 cm after three years.
- Treatment
- 224 kg N ha −1e0
- Outcome
- NO ‐ 3 ‐N accumulatione0
- Direction
- accumulatione0
- Qualifier
- 15‐ to 45‐cm depthe0
Not reportedTaxonOrgan / stageComparator
Verbatim
e0“Soil samples taken after 3 yr of continuous fertilization treatments showed a significant NO ‐ 3 ‐N accumulation at the 15‐ to 45‐cm depth only in plots treated with 224 kg N ha −1 .”
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See all 343 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.