All issues
Volume 21 (1976)
- Issue 4 Pages 153-
- Issue 3 Pages 101-
- Issue 2 Pages 49-
- Issue 1 Pages 1-
- Issue Suppl Pages 1-
Volume 21, Issue 2
Displaying 1-10 of 10 articles from this issue
- |<
- <
- 1
- >
- >|
-
Yasuo KASAHARA1976 Volume 21 Issue 2 Pages 49-55
Published: September 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDownload PDF (867K) -
5. Requirement of Temperature Condition in Germination and Its Relation to Seasonal Distribution of Emergence in the FieldYasushi WATANABE, Fumihiko HIROKAWA1976 Volume 21 Issue 2 Pages 56-60
Published: September 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSSeeds of common lambsquarters (Chenopodium album L.), Himeinubie, a variety of barnyardgrass (Echinochloa crusgalli Beauv. var. praticola Ohwi), and pale smartweed (Polygonum lapathifolium L.) were buried in soil in Wagner pots and held in incubators at 5° or 10°C. After 70-80 days, the seeds were recovered in the dark and examined for their response to temperature conditions. Prior to incubation, a half of the seeds were preirradiated by sunlight for 5 minutes, and the other half of the seeds were kept in the dark. The temperature conditions included 21 treatments: at the constant temperatures of 5°, 10°, 15°, 20°, 25°, and 30°C, and 15 combinations of alternating temperature.
The seeds kept in darkness showed a higher germination percentage at the alternating temperatures. In common lambsquarters, marked effects were given by a temperature shift greater than 15°C from the lower temperature of 5°C. At a lower range of temperature of 5° and 10°C followed by a higher range of temperature below than 20°C, the seeds of Himeinubie failed to germinate, but were successful when followed by 25°C. At 30°C, however, germination proceeded considerably without any temperature alternation. In pale smartweed, the reaction of seeds to the temperature was similar to common lambsquarters at 15° and 20°C, and to Himeinubie at 25° and 30°C respectively. The seeds preirradiated showed a great promotion in germination at the wide range of temperature conditions.
It was proved that the seasonal germination curves estimated from both the germination percentage in laboratory and the temperature of soil surface, almost coincided with the observed seasonal changes in emergence in the field in the case of common lambsquarters and Himeinubie during the period from spring to summer. It was probable, however, that an induced dormancy was involved in emergence of pale smartweed during the period from summer to autumn and common lambsquarters in autumn.View full abstractDownload PDF (622K) -
Katsuo ITO1976 Volume 21 Issue 2 Pages 60-64
Published: September 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSThe weed flora in Tokachi district, Hokkaido, was surveyed at 1967 to 1974. It consisted of 415 species of 67 families, including the poisonous weeds and the naturalized weeds grown in non-arable lands.
These species were classified in the following three groups according to growing places: the upland weeds which are found in and around upland fields (96 annuals and 141 perennials-a total of 237 species of 43 families), the lowland weeds which are found in and around lowland fields (29 annuals and 51 perennials-a total of 80 species of 30 families) and the common weeds which grows both in upland fields and lowland fields (12 annuals and 21 perennials-a total of 33 species of 12 families).
76 species of weeds belonging to 32 families were identified as poisonous. These weeds included 17 annuals and 59 perennials, and 40 species of them were found in only non-arable lands.
119 species of the naturalized weeds were found in arable or non-arable lands. They consisted of 57 annuals and 62 perennials, belonging to 23 families, and 88 species among them were growing in upland fields.
By their weedy members alone, the following families most plentifully represented are: Compositae (59), Gramineae (58), Polygonaceae (29), . Cruciferae (21), Caryophyllaceae (20), Cyperaceae (18), Leguminosae (17), and Ranunculaceae (17).View full abstractDownload PDF (500K) -
I. A Developmental Study of the SeedlingsYasuo TOMIHISA1976 Volume 21 Issue 2 Pages 64-68
Published: September 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSIn order to contribute the knowledge of ecology of water hyacinth in western Japan, a study was made of the development of the seedlings under different conditions. The results are summed as follows.
1) Before six leaf-stage the seedlings of water hyacinth always develops acicular leaves only. But at its later stage leaves of typical shape with swallen petioles are seen.
2) A seedling, which has been grown on and fixed to the soil 10 to 15cm beneath the water surface, comes floated at about its 10 leaf-stage as its old roots have gone to decay.
3) It is general that the seedlings, rooted in the soil, have few lateral roots, but those floating on the water surface develops many long lateral roots.View full abstractDownload PDF (577K) -
Takao KIDA, Hiroshi MIZUNO, Koichi TAKINAMI1976 Volume 21 Issue 2 Pages 68-72
Published: September 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSThis examination was undertaken in order to develop new herbicides which may not cause enviromental pollution. The present paper describes the herbicidal characteristics of lauryl DL-valinate·HCl (AH-1) in paddy field and its combination with methoxyphenone (NK-049). The results obtained are summarized as follows:
(1) AH-1 did not inhibit the germination of millet, but inhibited the elongation of root and shoot in Petri dish.
(2) AH-1 showed herbicidal effect on barnyardgrass and broadleaf weeds at early post-emergence application of 100g/a.
(3) The herbicidal activity of AH-1 on barnyardgrass under flooded condition was much better at 3cm of water depths.
(4) The synergistic action of AH-1 and NK-049 was recognized for barnyardgrass. The application of their combination (mixing ratio 2:1) at 45g/a was very effective in controlling barnyardgrass and broadleaf weeds, and injury for transplanted rice plants was not observed.View full abstractDownload PDF (523K) -
1. Weed Distribution in the Mulberry Fields in Annaka DistrictYouzo USAMI1976 Volume 21 Issue 2 Pages 72-76
Published: September 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDistribution of Weeds in the mulberry fields in Annaka district where is located a zinc refinery, was investigated on October, 1971. The results are summarized as follows;
On the area within 5km from the refinery, 31 families and 72 species of weeds were observed, whereas in the vicinity of the smelter, they were limited to 3 species only (Digitaria adscendens Henr., Equisetum arvense L. and Paederia scandens Merrill). Nevertheless, the relationship between kinds of weeds and distance of direction to the stack were not noticeable.View full abstractDownload PDF (574K) -
2. Auto-ecology of Galinsoga parviflora Cav.Youzo USAMI1976 Volume 21 Issue 2 Pages 76-80
Published: September 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSFor the relevant planning of weed control in mulberry field, information on auto-ecology of Galinsoga Parviflora Cav. was investigated in the cource of growing season, with regard to alternation of generations, florescence, seed production and germination ability of seeds.
Experiments were carrid out in the Hino-mulberry field (Hino-shi) for three years from 1971.
The results were as follows;
Germination of Galinsoga was observed from late March till early November during which 3 to 4 times of alternation of generations took place.
13, 400 achenes were enumerated per plant that bore as much as 400, 000 seeds. Stem height and leaf area expanded more prosperously in summer than in spring or autumn, accordingly, growth of Galinsoga being dependent on season of germination. High temperature seemed to urge growth, florescence and maturity.
It was recognized that Galinsoga belonged to a type having light-sensitive seed.View full abstractDownload PDF (569K) -
Nobumasa ICHIZEN1976 Volume 21 Issue 2 Pages 80-83
Published: September 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSThirty-four varieties of rice plants under flooded condition were treated by benthiocarb. At the emergence stage, IR-8, Leuang Tawng and C4-63 were very sensitive, and Taichung Native was a little sensitive. But twenty-four varieties of rice plants cultivated in Japan and Tainan-3, Bluebonnet, Bluebelle, Caluro, Calrose and Rafacello were tolerant to benthiocarb. At the 2-leaf stage, every variety was very tolerant to benthiocarb. Therefore, it was considered that Indica was more sensitive to benthiocarb than the other varieties.
IR-8 (Indica) was mone sensitive to simetryne than Nihonbare (Japonica) at the emergence stage and 2-leaf stage.View full abstractDownload PDF (361K) -
Goro HASHIMOTO1976 Volume 21 Issue 2 Pages 84-90
Published: September 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDownload PDF (665K) -
Kunikazu UEKI, Hiroshi HYAKUTAKE, Tadao YAMADA, Katuyoshi NOGUCHI, Min ...1976 Volume 21 Issue 2 Pages 91-96
Published: September 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDownload PDF (820K)
- |<
- <
- 1
- >
- >|