Abstract
A 2-yr field study was conducted during 2007 and 2008 at Stoneville, MS, to determine the effect of twin-row (two rows 38 cm apart on 102-cm beds) and single-row (on 102-cm beds) patterns and glyphosate POST applications with and without fluometuron + S -metolachlor PRE on cotton canopy closure, weed control, and lint yield in two cultivars (‘DP117B2RF’, early maturity, hairy leaf; ‘DP164B2RF’, mid to full maturity, smooth leaf) under an irrigated environment. The experiment was conducted in a split–split plot arrangement of treatments in a randomized complete block design with row pattern as the main plot, cultivars as the subplot, and herbicide programs as the subsubplot. Cotton canopy closed 2 wk earlier in the twin-row pattern compared to the single-row pattern. Canopy closure was unaffected by cultivars and herbicide programs. Control of nine predominant weeds was sufficient (≥ 95%) to support cotton production. Total weed dry biomass was reduced by 35% in twin rows compared to the single-row pattern, 15% in DP117B2RF compared to DP164B2RF cultivar, and ≥ 97% with glyphosate early POST (EPOST), EPOST followed by (fb) mid-season POST (MPOST), EPOST fb MPOST fb late POST (LPOST) following PRE herbicides or three applications of glyphosate POST only without PRE herbicides compared to no herbicide. Cotton grown in twin-row pattern produced 6% higher lint yield than single-row cotton. Cultivar DP117B2RF produced 23% higher lint yield than cultivar DP164B2RF. Lint yields were higher with glyphosate EPOST fb MPOST, EPOST fb MPOST fb LPOST following PRE herbicides or three applications of glyphosate POST only without PRE herbicides (1,210 to 1,230 kg/ha) compared to glyphosate EPOST following PRE herbicides (1,130 kg/ha). These results demonstrated that cotton grown in twin-rows closed canopy early and produced higher lint yields than cotton grown in single-rows.
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Claims 9
Claim · model-written summary
Twin rows closed the cotton canopy two weeks earlier than single rows.
- Taxon
- Cotton
Gossypium hirsutume0 - Treatment
- twin-row patterne0
- Outcome
- canopye0
- Direction
- earliere0
- Value
- 2 wke0
- Comparator
- single-row patterne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton canopy closed 2 wk earlier in the twin-row pattern compared to the single-row pattern.”
Claim · model-written summary
Cultivar and herbicide program did not affect canopy closure.
Verbatim
e0“Canopy closure was unaffected by cultivars and herbicide programs.”
Claim · model-written summary
Control of nine predominant weeds reached at least 95%.
Not reportedTaxon
Verbatim
e0“Control of nine predominant weeds was sufficient (≥ 95%) to support cotton production.”
Claim · model-written summary
Twin rows reduced total weed dry biomass by 35% compared with single rows.
- Treatment
- twin rowse0
- Outcome
- weed dry biomasse0
- Direction
- reducede0
- Value
- 35%e0
- Comparator
- single-row patterne0
Not reportedTaxon
Verbatim
e0“Total weed dry biomass was reduced by 35% in twin rows compared to the single-row pattern”
Claim · model-written summary
DP117B2RF reduced total weed dry biomass by 15% relative to DP164B2RF.
Not reportedTaxonOutcomeDirection
Verbatim
e0“15% in DP117B2RF compared to DP164B2RF cultivar”
Claim · model-written summary
The listed glyphosate programs reduced weed biomass at least 97% relative to no herbicide.
Not reportedTaxonOutcomeDirection
Verbatim
e0“≥ 97% with glyphosate early POST (EPOST), EPOST followed by (fb) mid-season POST (MPOST), EPOST fb MPOST fb late POST (LPOST) following PRE herbicides or three applications of glyphosate POST only without PRE herbicides compared to no herbicide.”
Claim · model-written summary
Twin-row cotton had 6% higher lint yield than single-row cotton.
- Taxon
- CottonGossypium hirsutume0
- Treatment
- twin-row patterne0
- Outcome
- lint yielde0
- Direction
- highere0
- Value
- 6%e0
- Comparator
- single-row cottone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton grown in twin-row pattern produced 6% higher lint yield than single-row cotton.”
Claim · model-written summary
DP117B2RF yielded 23% more lint than DP164B2RF.
Not reportedTaxon
Verbatim
e0“Cultivar DP117B2RF produced 23% higher lint yield than cultivar DP164B2RF.”
Claim · model-written summary
The more intensive glyphosate programs yielded more lint than EPOST after PRE alone.
- Treatment
- glyphosate EPOST fb MPOSTe0
- Outcome
- Lint yieldse0
- Direction
- highere0
- Value
- 1,210 to 1,230 kg/hae0
- Qualifier
- 1,130 kg/hae0
- Comparator
- glyphosate EPOST following PRE herbicidese0
Not reportedTaxon
Verbatim
e0“Lint yields were higher with glyphosate EPOST fb MPOST, EPOST fb MPOST fb LPOST following PRE herbicides or three applications of glyphosate POST only without PRE herbicides (1,210 to 1,230 kg/ha) compared to glyphosate EPOST following PRE herbicides (1,130 kg/ha).”
The same questions in other papers
glyphosate · yield · Gossypium hirsutum (cotton)Results differ
34 papers in the same direction as this paper · 20 in the opposite direction · 6 reporting no difference from an alternative
- no effect
- positive
- negative
57 papers more in this group
See all 61 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.