All issues
Volume 24 (1979)
- Issue 4 Pages 217-
- Issue 3 Pages 149-
- Issue 2 Pages 55-
- Issue 1 Pages 1-
- Issue Suppl Pages 1-
Volume 24, Issue 2
Displaying 1-13 of 13 articles from this issue
- |<
- <
- 1
- >
- >|
-
Tadami AKATSUKA1979 Volume 24 Issue 2 Pages 55-63
Published: August 25, 1979
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDownload PDF (6892K) -
Weeding Efficacy of Tadpole Shrimps in Transplanted Rice FieldsMasanao YONEKURA1979 Volume 24 Issue 2 Pages 64-68
Published: August 25, 1979
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSIn order to study weeding efficacy of tadpole shrimps as an agent for biological control of weeds in transplanted rice, their eggs deposited in the soil were released in the plots at the puddling time and the relations between their population and weed growth were surveyed.
The results obtained are as follows:
1) Some metanauplii and youngs of tadpole shrimps (Triops granarius Lucas and T. longicaudatus LeConte) were found on the 4th day after puddling, almost the same time as weed emergence. They began to scratch the soil surface 6 to 7 days after their appearance.
2) The close negative correlation was found between the population density of tadpole shrimps and the amount of residual weeds (r=-0.793).
3) It is indicated that the following regression equation was most suitable to express the relation of the number of residual weeds (y%) to the number of tadpole shrimps per m2 (x); y=1/1.046+1.0518x
4) From this regression curve, the successful population density of tadpole shrimps for control of weeds was estimated at about 50 or more per square meter. They gave no damage to the transplanted rice.View full abstractDownload PDF (581K) -
Yumiro NAGAO1979 Volume 24 Issue 2 Pages 69-73
Published: August 25, 1979
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSThe sprout of P. ternata was occurred in the middle or the end of April in Kyoto district. The development of the top following the sprout brings not only thickening of corms, but also growing of bulblets on the petiole. Therefore, a sprout of corms left a source for propagation of this plant behind. The purpose of this paper was to report on some aspects of sprouting of corms and bulblets of P. ternata.
1) The corms and bulblets began to sprout, if they were under low temperature for 30-50 days. However, they were not able to sprout when they were kept in the constant temperatures of 15°C. So they were broken their dormancy under the lower temperature of winter season and they began to sprout from the middle to the end of April.
2) The corms whose tops and roots were removed from June to September were planted again. Within few days after the treatment they began to resprout.
3) The bulblets sprouted more than 80% in June to August, but their sprouting percentage suddenly decreased in September. The sprouting percentage of the small bulblets was not so high as the large ones.
4) The apical dominance was not recognized in every bud of corms.View full abstractDownload PDF (2571K) -
8. Change in Weed Vegetation in the Slash-and-burn Method of AgricultureSeiko SUGAWARA1979 Volume 24 Issue 2 Pages 74-80
Published: August 25, 1979
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSBuckwheat, japanese millet, red beans and soybeans in the first experiment, and buckwheat, italian millet, taro and soybeans in the second experiment, were successively sown in different crop sequences during four years without soil cultivation and fertilization on a bare field after cutting off trees and burning off vegetation. Grop yields, chemical properties of soil and change in weed vegetation were investigated. Considerable differences were observed in the total yields of crops among the different crop sequences.
The highest yields were obtained at the plots where japanese millet→red beans→soybeans→buckwheat (400kg per 10a as the total of four years) and italian millet→taro→soybeans→buckwheat (1, 383kg) were cultivated in this order. In all of the plots, number of species, population and total weight of weeds were small in the first year, but since the second year, these values increased, especially after the cultivation of japanese or italian millet.
On the other hand, soil pH, base exchange acidity and saturation degree of base remarkably decreased in the year when japanese or italian millet was cultivated. Weed invasion occurred after the cultivation of millets was seemed to have resulted from the deterioration of chemical properties of soil.View full abstractDownload PDF (929K) -
Shigeya YAMAKAWA, Hisao KOBAYASHI, Kunikazu UEKI1979 Volume 24 Issue 2 Pages 81-85
Published: August 25, 1979
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSSagittaria trifolia L., a perennial paddy weed, was studied to obtain its life history for control of this weed. Experiment was carried out for the effects of various levels of nitrogen fertilization on the growth and production of propagules, being applied at 0, 8, 16 and 32kg N/10a.
1) The growth both in natural plant height and the number of arrow-shaped leaves increased as level of the fertilizer increased.
2) The plants fertilized at 32kg N/10a emerged inflorescences and flowered later than those at lower nitrogen levels.
3) The number of fruits increased with the increase of nitrogen level, but the plants fertilized at 16kg N/10a produced the fruits which showed the highest 100 kernel weight, i. e. 57.6mg.
4) Nitrogen increased the production of tubers in number and the total fresh weight per plant, and conversely decreased both dry weight and percent dry matter of a tuber.
5) The production ratio of seed to tuber, in weight, increased with increase of nitrogen level.View full abstractDownload PDF (524K) -
Takayoshi KATAOKA, Kiyoshi KOJIMA, Shooji FURUYA1979 Volume 24 Issue 2 Pages 86-91
Published: August 25, 1979
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSField studies were carried out to investigate the growth and seed production of Monochoria vaginalis Presl. in rice-field transplanted with young seedlings.
Growth and seed production were reduced as emergence of the plants was delayed. Seeds were produced only a little when the plants emerged seventeen days after transplanting of rice.
More vigorous growth and seed prooduction of the plants were induced by early planting of rice, in which rice seedlings were transplanted at 23rd May, than by later planting of rice.
The number of seeds produced by an individual plant was expressed by the product of three components, i. e. inflorescences per plant, capsules per inflorescence and seeds per capsule. Among these components, the number of inflorescences varied considerably according to foliar growth of the plants and closely related to the amount of seed production.
The number of seeds produced per plant was highly correlated with the foliar air-dry weight and the number of inflorescences or the mature capsules per plant, especially with the last. This indicates that the amount of seed production can be estimated exactly using the number of matured capsules.View full abstractDownload PDF (595K) -
Hidejiro SHIBAYAMA1979 Volume 24 Issue 2 Pages 92-95
Published: August 25, 1979
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSHabitats of waterhyacinth [Eichhornia crassipes (Mart.) Solms ] in Chikugo River and its tributaries of Kyushu were investigated on October, 1978. Waterhyacinth plants in the lower stream of the River were mainly those which flowed down from its middle one or creeks of the paddy area through tributaries. In the middle stream, large populations of the plant were found especially around Kurumecity to the junction with Kose River. Among tributaries of the middle stream of Chikugo River, Homan, Shianbashi, Kose, Koishibaru and Katsura Rivers were infested with waterhyacinth. In the upper stream above the junction with Katsura River, there grew no plant of waterhyacinth.View full abstractDownload PDF (1914K) -
I. Antidotal Effect of Amines against the Herbicidal Compound, N-(3, 4-dichlorophenylcarbamoyl)-N-methyl glycine monohydrate (CD)Mitsuyoshi OKII, Masayuki TERANISHI, Makoto KONNAI, Tetsuo TAKEMATSU1979 Volume 24 Issue 2 Pages 96-100
Published: August 25, 1979
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSIn the course of our search of new herbicides among amino acid related compounds, we discovered that CD possessed relatively strong post-emergence herbicidal activity against broadleaf weeds.
In order to find out the excellent antidote in cereal species, notably wheat, which may not reduce the herbicidal effects of CD and CD related compounds, antidotal activities of amine compounds were examined.
(1) 1, 8-Diaminooctane (OM) and p, p′-diaminomethylbiphenyl (DABP) exhibited an excellent selective antidotal effect. However, DABP was not suitable because of resulting in a wheat malformation.
(2) Antidote OM should be used in an amount of 1 mole and above per 1 mole of CD. A series of compounds replaced the hydorogen atoms of OM amino groups with other organic radicals were without effect.
(3) Antidotal activity of even carbon numbered α, ω-diaminoalkanes (DA) was higher than that of odd numbered DA. Such phenomena were attributable to the characteristics of DA itself.
(4) Primary amine and free base were essential for the antidotal effect.View full abstractDownload PDF (481K) -
II. Antidotal Effect of OM against the N-(3, 4-dichlorophenylcarbamoyl)-N-methyl glycine H2O (CD) and CD Related CompoundsMitsuyoshi OKII, Ikuo MATSUKUMA, Makoto KONNAI, Tetsuo TAKEMATSU1979 Volume 24 Issue 2 Pages 101-106
Published: August 25, 1979
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSAntidotal effects of OM against the herbicidal compounds, CD and CD related compounds were examined on their herbicidal activity changes.
(1) Suceptibility of Gramineae and Polygonaceae to CD decreased by the addition of OM. On the contrary, those of broad leaf plants increased. Such phenomenal results were not dominated by plant leaf stage.
(2) Antidotal action of OM on wheat injury by CD was diminished by simulated rainfall and high temperature condition. Reducing injury action of simultaneous treatment with CD and OM was more effective than the separate treatment with them.
(3) OM action to wheat and barley injury by CD-analogues depended upon a chemical species of CD-analogues. It was necessary to choose a OM/CD-analogue mix ratio for the purpose of reducing injury by CD-analogue. Herbicidal activity of CD-analogues on mustard (Brassica juncea Coss.) increased by the addition of OM.
(4) OM efficacy as antidote was presumed to be independent of characteristic component i. e., substituted β-diketones of epicuticular wax.View full abstractDownload PDF (551K) -
Akira FUJIMOTO1979 Volume 24 Issue 2 Pages 107-109
Published: August 25, 1979
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDownload PDF (4666K) -
Seiji FURUYA, Ryozo MIZUTA, Munehisa ODAN, Junko NAGAKURA, Toyoji HOSO ...1979 Volume 24 Issue 2 Pages 110-112
Published: August 25, 1979
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDownload PDF (292K) -
Saburo OKATAKE, Yasuo TOMIHISA, Yukihiko NAKANO1979 Volume 24 Issue 2 Pages 113-116
Published: August 25, 1979
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDownload PDF (1833K) -
Kunikazu UEKI, Hiroshi HYAKUTAKE, Katsuichiro KOBAYASHI, Minoru TAKABA ...1979 Volume 24 Issue 2 Pages 117-124
Published: August 25, 1979
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDownload PDF (1015K)
- |<
- <
- 1
- >
- >|