Abstract
Abstract Two field experiments were conducted at Ngala in the Lake Chad Basin during the wet seasons of 1981 and 1982 to investigate weed competition as well as chemical and manual weed control in irrigated cotton (Gossypium hirsutum L.) var. Acala 1517C. Pre‐emergence herbicides and their mixtures were tested in replicated, randomized block trials in which the cotton variety was grown 30 cm apart on 90 cm ridges and fertilized with 50 kg N/ha and 40 kg P2O5/ha. The results showed the importance of early weed competition in irrigated cotton. Weed control 14 days after cotton emergence produced optimum growth and yield. Subsequent weeding delay in 7‐day increments restricted crop growth and reduced yield significantly. Unweeded cotton suffered an average yield loss of 82.0%. Yields of plots treated with fluridone at 1.0 kg a.i./ha and fluometuron at 3.0 kg a.i./ha respectively applied 1 to 2 days after sowing were significantly higher than the yield of the untreated plots and plots hand weeded once later than 21 days after crop emergence. Plots hand weeded once however, yielded significantly higher than the untreated plots.
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Claims 6
Claim · model-written summary
Weed control 14 days after emergence produced optimum cotton growth and yield.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- Weed control 14 days after cotton emergencee0
- Outcome
- growth and yielde0
- Direction
- optimume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Weed control 14 days after cotton emergence produced optimum growth and yield.”
Claim · model-written summary
Each seven-day delay in weeding restricted cotton growth and significantly reduced yield.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- weeding delay in 7‐day incrementse0
- Outcome
- crop growth and reduced yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subsequent weeding delay in 7‐day increments restricted crop growth and reduced yield significantly.”
t0“irrigated cotton”
Claim · model-written summary
Unweeded cotton lost 82.0% of yield on average.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- yield losse0
- Direction
- losse0
- Value
- 82.0%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Unweeded cotton suffered an average yield loss of 82.0%.”
Claim · model-written summary
Fluridone-treated plots yielded significantly more than untreated and late hand-weeded plots.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- fluridone at 1.0 kg a.i./hae0
- Outcome
- Yieldse0
- Direction
- highere0
- Comparator
- untreated plots and plots hand weeded once later than 21 days after crop emergencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of plots treated with fluridone at 1.0 kg a.i./ha and fluometuron at 3.0 kg a.i./ha respectively applied 1 to 2 days after sowing were significantly higher than the yield of the untreated plots and plots hand weeded once later than 21 days after crop emergence.”
t0“irrigated cotton”
Claim · model-written summary
Fluometuron-treated plots yielded significantly more than untreated and late hand-weeded plots.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- fluometuron at 3.0 kg a.i./hae0
- Outcome
- Yieldse0
- Direction
- highere0
- Comparator
- untreated plots and plots hand weeded once later than 21 days after crop emergencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of plots treated with fluridone at 1.0 kg a.i./ha and fluometuron at 3.0 kg a.i./ha respectively applied 1 to 2 days after sowing were significantly higher than the yield of the untreated plots and plots hand weeded once later than 21 days after crop emergence.”
t0“irrigated cotton”
Claim · model-written summary
One hand weeding significantly increased yield over untreated plots.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- hand weeded oncee0
- Outcome
- yieldede0
- Direction
- highere0
- Comparator
- untreated plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plots hand weeded once however, yielded significantly higher than the untreated plots.”
t0“irrigated cotton”
The same questions in other papers
Fluridone · yield · Gossypium hirsutum (cotton)Results differ
1 paper in the same direction as this paper · 2 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- no effect
1 paper more in this group
See all 5 papers →fluometuron · yield · Gossypium hirsutum (cotton)Results differ
12 papers in the same direction as this paper · 8 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- no effect
18 papers more in this group
See all 22 papers →herbicide · yield · Gossypium hirsutum (cotton)Positive and negative results
122 papers in the same direction as this paper · 51 in the opposite direction · 8 reporting no difference from an alternative
- no effect
- negative
- negative
178 papers more in this group
See all 182 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.