Abstract
Ultra‐narrow row (UNR) systems and N fertilizer can influence cotton ( Gossypium hirsutum L.) crop maturation. Study objectives were to measure impacts of UNR systems and N fertilizer rates on cotton maturation and to identify mechanisms by which these effects occurred. The location was Burleson County, Texas. In the split plot design, whole plots were N rates of 0, 50, 101, and 151 kg ha −1 . Split plots were 19‐, 38‐ (both UNR), and 76‐cm (conventional row, CR) row spacings with 296,600, 195,400, and 136,300 plants ha −1 , respectively. Thirty, 60, and 85% harvestable seedcotton each occurred 1.5 to 2.9 d earlier in UNR than CR spacings. First boll set occurred 1 d later in 19‐cm than in wider row spacings. Boll set rate m −2 was greater in 19‐ than 76‐cm row spacing during a 5‐d flowering period shortly after first boll set, but did not differ by row spacing during three flowering periods thereafter. The percentage first position bolls was lower with wider row spacing, suggesting greater potential for concurrent boll set at multiple sites on individual plants. Eventual development of nonfirst position fruiting sites in 76‐cm row spacing may have contributed to confinement of faster boll set in 19‐cm row spacing to early bloom. Nitrogen rates did not affect the timing of 30, 60, or 85% harvest. Reductions in bolls plant −1 were counteracted by slower boll set rates with lower N. The limited observed interactions of N and row spacing do not suggest advantages from suboptimal N rates in UNR cotton.
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Claims 9
Claim · model-written summary
Thirty, 60, and 85% harvestable seedcotton occurred 1.5 to 2.9 days earlier in ultra-narrow than conventional rows.
- Taxon
- cotton
Gossypium hirsutume1 - Treatment
- UNRe0
- Outcome
- harvestable seedcottone0
- Direction
- earliere0
- Value
- 1.5 to 2.9 de0
- Comparator
- CR spacingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thirty, 60, and 85% harvestable seedcotton each occurred 1.5 to 2.9 d earlier in UNR than CR spacings”
e1“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
First boll set occurred one day later in 19 cm than wider rows.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- 19‐cme0
- Outcome
- First boll sete0
- Direction
- latere0
- Value
- 1 de0
- Comparator
- wider row spacingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“First boll set occurred 1 d later in 19‐cm than in wider row spacings”
e1“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Boll set rate was greater in 19 cm than 76 cm rows during early flowering.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- 19‐e0
- Outcome
- Boll set rate m −2e0
- Direction
- greatere0
- Qualifier
- during a 5‐d flowering period shortly after first boll sete0
- Comparator
- 76‐cm row spacinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Boll set rate m −2 was greater in 19‐ than 76‐cm row spacing during a 5‐d flowering period shortly after first boll set”
e1“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Boll set rate did not differ by row spacing in three later flowering periods.
- Taxon
- cottonGossypium hirsutume2
- Treatment
- row spacinge0
- Outcome
- Boll set rate m −2e1
- Direction
- did not differe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not differ by row spacing during three flowering periods thereafter”
e1“Boll set rate m −2 was greater”
e2“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Percentage of first-position bolls was lower at wider row spacing.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- wider row spacinge0
- Outcome
- percentage first position bollse0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage first position bolls was lower with wider row spacing”
e1“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Nitrogen rate did not affect timing of 30, 60, or 85% harvest.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- Nitrogen ratese0
- Outcome
- timing of 30, 60, or 85% harveste0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen rates did not affect the timing of 30, 60, or 85% harvest”
e1“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Lower nitrogen reduced bolls per plant.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- lower Ne0
- Outcome
- bolls plant −1e0
- Direction
- Reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reductions in bolls plant −1 were counteracted by slower boll set rates with lower N”
e1“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Lower nitrogen slowed boll set rates.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- lower Ne0
- Outcome
- boll set ratese0
- Direction
- slowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reductions in bolls plant −1 were counteracted by slower boll set rates with lower N”
e1“cotton ( Gossypium hirsutum L.)”
Claim · model-written summary
Observed interactions did not suggest an advantage from suboptimal nitrogen in ultra-narrow cotton.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- do not suggest advantages from suboptimal N rates in UNR cottone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The limited observed interactions of N and row spacing do not suggest advantages from suboptimal N rates in UNR cotton”
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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.