Abstract
Between 1946 and 1950 multifactorial field experiments were carried out to determine the potentialities and effectiveness of chlorinated phenoxyacetic acids for the selective control of weeds in linseed (oil flax). The initial experiments of 1946 demonstrated that treatment with sodium 2-methyl-4-chlorophenoxyacetate led to considerable increases in the yield of seed through a reduction of the weed population and the consequent decrease in weed competition. The subsequent experiments were undertaken on relatively weed-free crops so that the direct effects on the crop of compound, formulation, and stage of growth at the time of application could be investigated along with differences in varietal response. Amongst the observations made were time of flowering, straw length, the yield of seed, capsule production, seeds per capsule and the weight, oil content, protein content and germination capacity of the seed. At similar dosages sodium methylchlorophenoxyacetate is less phytotoxic than sodium 2, 4-dichlorophenoxyacetate while the parent acid and particularly the ethyl ester of the dichloro - compound are much more injurious. With sodium methylchlorophenoxyacetate the tolerance is greatest between the post-cotyledon stage and a height of 20–25 cm.; within this range of plant development dosages up to 3·5 lb./acre have no adverse effects on the yield of seed. Treatment within 2–3 weeks of flowering delays flowering and reduces the seed weight. When dichloro-compounds are employed there are additional effects, such as the formation of abortive capsules or a reduction in the number of seeds per capsule. Under some conditions the oil content and the germination capacity of the seed is depressed but the protein content is increased.
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Claims 13
Claim · model-written summary
Sodium 2-methyl-4-chlorophenoxyacetate increased seed yield.
- Taxon
- linseed (oil flax)e1
- Treatment
- sodium 2-methyl-4-chlorophenoxyacetatee0
- Outcome
- yield of seede0
- Direction
- considerable increasese0
Not reportedComparator
Verbatim
e0“treatment with sodium 2-methyl-4-chlorophenoxyacetate led to considerable increases in the yield of seed”
e1“linseed (oil flax)”
Claim · model-written summary
The herbicide reduced the weed population.
- Taxon
- linseed (oil flax)e1
- Treatment
- sodium 2-methyl-4-chlorophenoxyacetatee0
- Interactor
- weede0weed
- Outcome
- weed populatione0
- Direction
- reductione0
Not reportedComparator
Verbatim
e0“treatment with sodium 2-methyl-4-chlorophenoxyacetate led to considerable increases in the yield of seed through a reduction of the weed population”
e1“linseed (oil flax)”
Claim · model-written summary
Sodium methylchlorophenoxyacetate was less phytotoxic than sodium 2, 4-dichlorophenoxyacetate at similar doses.
Verbatim
e0“At similar dosages sodium methylchlorophenoxyacetate is less phytotoxic than sodium 2, 4-dichlorophenoxyacetate”
e1“linseed (oil flax)”
Claim · model-written summary
The parent acid was more injurious to linseed.
Not reportedComparator
Verbatim
e0“the parent acid and particularly the ethyl ester of the dichloro - compound are much more injurious”
e1“linseed (oil flax)”
Claim · model-written summary
The ethyl ester of the dichloro compound was particularly injurious.
- Taxon
- linseed (oil flax)e1
- Treatment
- the ethyl ester of the dichloro - compounde0
- Outcome
- injuriouse0
- Direction
- much moree0
Not reportedComparator
Verbatim
e0“the parent acid and particularly the ethyl ester of the dichloro - compound are much more injurious”
e1“linseed (oil flax)”
Claim · model-written summary
Tolerance to sodium methylchlorophenoxyacetate was greatest from post-cotyledon to 20–25 cm height.
Verbatim
e0“With sodium methylchlorophenoxyacetate the tolerance is greatest between the post-cotyledon stage and a height of 20–25 cm.”
e1“linseed (oil flax)”
Claim · model-written summary
Up to 3·5 lb./acre during the tolerant stage had no adverse effect on seed yield.
- Taxon
- linseed (oil flax)e1
- Treatment
- sodium methylchlorophenoxyacetatee2
- Outcome
- yield of seede0
- Direction
- no adverse effectse0
- Value
- 3·5 lb./acree0
Not reportedComparator
Verbatim
e0“within this range of plant development dosages up to 3·5 lb./acre have no adverse effects on the yield of seed”
e1“linseed (oil flax)”
e2“With sodium methylchlorophenoxyacetate”
Claim · model-written summary
Treatment within 2–3 weeks of flowering delayed flowering.
- Taxon
- linseed (oil flax)e1
- Treatment
- Treatment within 2–3 weeks of floweringe0
- Outcome
- floweringe0
- Direction
- delayse0
Not reportedComparator
Verbatim
e0“Treatment within 2–3 weeks of flowering delays flowering”
e1“linseed (oil flax)”
Claim · model-written summary
Treatment within 2–3 weeks of flowering reduced seed weight.
- Taxon
- linseed (oil flax)e1
- Treatment
- Treatment within 2–3 weeks of floweringe0
- Outcome
- seed weighte0
- Direction
- reducese0
Not reportedComparator
Verbatim
e0“Treatment within 2–3 weeks of flowering delays flowering and reduces the seed weight”
e1“linseed (oil flax)”
Claim · model-written summary
Dichloro compounds produced abortive capsules.
Not reportedComparatorDirection
Verbatim
e0“When dichloro-compounds are employed there are additional effects, such as the formation of abortive capsules”
e1“linseed (oil flax)”
Claim · model-written summary
Dichloro compounds reduced seeds per capsule.
- Taxon
- linseed (oil flax)e1
- Treatment
- dichloro-compoundse0
- Outcome
- number of seeds per capsulee0
- Direction
- reductione0
Not reportedComparator
Verbatim
e0“When dichloro-compounds are employed there are additional effects, such as the formation of abortive capsules or a reduction in the number of seeds per capsule”
e1“linseed (oil flax)”
Claim · model-written summary
Under some conditions, seed oil content and germination capacity were depressed.
Verbatim
e0“Under some conditions the oil content and the germination capacity of the seed is depressed”
e1“linseed (oil flax)”
Claim · model-written summary
Under some conditions, seed protein content increased.
Verbatim
e0“Under some conditions the oil content and the germination capacity of the seed is depressed but the protein content is increased”
e1“linseed (oil flax)”
The same questions in other papers
stage · yield · Linum usitatissimum (flax)Positive and negative results
3 papers in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- positive
7 papers more in this group
See all 11 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.