Eräiden ristisiittoisten viljelykasvien jalostuksesta Yhdysvalloissa

Paatela, Juhani

doi:10.23986/afsci.71266

Cited by 1 publication

(7 citation statements)

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“…and are within 2-3 weeks of flowering. These limits are similar to those arrived at by other workers for linseed (Paatela, 1949, results summarized by Chubb, 1950 and the previous data for flax (BlackmanetaZ. 1951).…”

Section: Discussionsupporting

confidence: 92%

“…67/48)-that late spraying and the higher dosages delay the onset of flowering but shorten the period of flowering. Some of these results contrast with those of Paatela (1949), who states that the duration of flowering was extended. This discrepancy may be due to differences in the methods of determining the end of flowering.…”

Section: Discussioncontrasting

confidence: 81%

“…It has previously been reported that the oil content of the seed can be reduced by synthetic growth regulators (Aberg et al, 1948;Paatela, 1949;Tandon, 1949), the greatest reductions taking place when the treatment is delayed. Aberg et al also found that the decrease in oil content was associated with an increase in the crude protein content.…”

Section: Discussionmentioning

confidence: 99%

“…Unless the treatments are such as to produce other marked adverse effects, the curvatures do not generally persist and if they do are not of any practical consequence and they were not studied in these experiments. Such epinastic effects have, however, been considered in detail by Paatela (1949), who observed that the curvature was maintained when the treatments were particularly injurious. Paatela also found that with many treatments the extension growth of the stem was retarded in the first few days but that subsequently the growth rate was higher than in the control plants; as a result there were only small differences in the final height of the plant.…”

Section: Discussionmentioning

confidence: 99%

“…At the same time as this research on linseed was proceeding, workers elsewhere, principally in the United States and Scandinavia, were carrying out investigations with the same objectives. Much of this work has since been published (Aberg, Hagsand & Vaartnou, 1948;Paatela, 1949;Tandon, 1949).…”

Section: Introductionmentioning

confidence: 99%

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Studies in selective weed control V. The control of weeds in linseed by chlorinated phenoxyacetic acids

Holly

Blackman

1954

J. Agric. Sci.

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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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Section: Discussionsupporting

confidence: 92%

Section: Discussioncontrasting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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