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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 1
Displaying 1-8 of 8 articles from this issue
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Yasuo KASAHARA1976 Volume 21 Issue 1 Pages 1-5
Published: July 25, 1976
Released on J-STAGE: December 17, 2009
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3. On the Growth and Chlorophyll Content in Leaves of Amaranthus viridis with Sowing the Seed Once a Month through the YearToshihiko IKENAGA, Yoshie KAMOTO, Hiromu OHASHI1976 Volume 21 Issue 1 Pages 6-11
Published: July 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSAn investigation was conducted to determine the time of cultivating with examinating the seed germination, the growth and the chlorophyll content of Amaranthus viridis by sowing seed once a month through the year.
1. As sowing time was latter, the germination percentage of seed became higher and the number of days until emergence reduced more.
2. With sowing in any month, the plants flowered. The number of days untill flowering was shorter on sowing in July and August, and longer on sowing from late autumn to winter.
3. The growth and the number of leaves increased on sowing from May to July.
4. The dry weight of leaves was more on sowing from January to April.
5. The chlorophyll content was higher on sowing in July and August, when the growth was worse.
6. The yield of chlorophyll was more on sowing from January to April, when the dry weight of leaves was more.View full abstractDownload PDF (495K) -
4. On the Growth and Chlorophyll Content of Amaranthus viridis with Sowing the Seed in April and AugustToshihiko IKENAGA, Shoko OKUBO, Hiromu OHASHI1976 Volume 21 Issue 1 Pages 11-16
Published: July 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSThe investigations were conducted to determine the period of cultivating and harvesting, and the effect of casamino acid on chlorophyll content in leaves of Amaranthus viridis. The seeds were sowed in April and August.
1. The growth was better on sowing in April, that is, the dry weight of leaves was more than three times on sowing in August.
2. The chlorophyll content more decreased, as dry weight of leaves more increased.
3. The chlorophyll content was higher during from early in June to early in July on sowing in April, another during from the middle of September to October on sowing in August; its maximum content was 1.46 percentage in the former and 1.41 percentage in the latter.
4. The yield of chlorophyll increased from late in June to late in July on sowing in April, its maximum yield on sowing in April was more than 2.5 times on sowing in August.
5. The treatment of 2, 000ppm casamino acid increased the content of chlorophyll b, but did not the growth and the content of chlorophyll a.View full abstractDownload PDF (541K) -
Kanji ISHIKAWA, Yuzuru ASANO, Yasuo NAKAMURA, Katsuyuki AKASAKI1976 Volume 21 Issue 1 Pages 16-21
Published: July 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSBehavior and disappearence of benthiocarb herbicide in water, soil and rice plant of paddy fields treated with its granular formulations were investigated. The formulations were applied to paddy fields at one or two weeks after transplanting rice plant.
The benthiocarb concentration in irrigation water showed about one ppm during two to four days after the application, and then decreased gradually with the elapse of time. The benthiocarb concentration in soil rapidly decreased within one week after the application. The half-life period of benthiocarb in soil was in about three days. The rate of the decrease in soil became slower after the first one week at the application. After one month benthiocarb was detected only in about 10% level of the initial concentration.
Benthiocarb was absorbed rapidly by rice plant and translocated throughout the plant. The benthiocarb concentration in the plant was higher in the top than in the root. The dissipation of benthiocarb was rapid in the former part, compared with the latter.
Remarkable leaching was not observed in the soil of treated paddy fields.View full abstractDownload PDF (751K) -
1. Effects of Shading Treatment on the Growth and Chemical Composition of WeedsSaburo MURAYAMA, Shinichi KOSAKA, Katsuhiro FUKUDA1976 Volume 21 Issue 1 Pages 21-26
Published: July 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSIn order to obtain the basic information of ecological weed control in pasture, the experiment dealt with the effects of shading treatment on the growth and chemical composition of weeds. The weeds examined were Chenopodium album L. var. centrorubrum Makino, Commelina communis L., Artemisia vulgaris L. var. vulgatissma Bess. and Rumex obtusifolius L.
Three levels of shading treatments used in this experiment were non-shading, 70% and 85% of shading of solar radiation.
The results obtained were summarized as follows:
1. The growing rate of plant height was intensified or lowered by the shading treatments in Chenopodium album and Artemisia vulgaris respectively. On the other hand, the growing rate was not affected in Rumex obtusifolius.
2. The number of the plant leaf was decreased by the shading treatments in each weed, especially in Chenopodium album, Artemisia vulgaris and Commelina communis.
3. The leaf area of Artemisia vulgaris was remarkably decreased by the shading treatments, especially of higher level of shading, while that of Rumex obtusifolius increased with shading.
4. The fresh weight and the dry weight of the plant were considerably decreased by the shading treatments in Chenopodium album, Artemisia vulgaris and Commelina communis. But both of these weights were not decreased in Rumex obtusifolius.
5. The TAC% of the plant tended to decrease in proportion to the increase of the shading rate, but the T-N% of the plant tended to increase. Therefore, TAC: T-N ratio of the plant was lessened in proportion to the increase of the shading.
From these results, it is concluded that the effects of shading treatments on the growth of weeds vary with the kinds of weeds, namely, Chenopodium album, Artemisia vulgaris and Commelina communis remarkably respond to the shading treatments, whereas Rumex obtusifolius do not much respond to them.View full abstractDownload PDF (656K) -
Seiichi KOJO, Shoichi TANAKA, Mitsuyoshi OKUMA, Motoi KAIHO1976 Volume 21 Issue 1 Pages 26-30
Published: July 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSThis study was conducted to establish the chemical control method of Sayanuka-gusa, on which bacterial leaf blight of rice plant (Xanthomonas oryzae Dowson) is parasitic in winter season. The results obtained are summarized as follows.
1. Liquid formulation of glyphosate [N-(phosphonomethyl) glycine] gave the excellent control of Sayanuka-gusa. Both water soluble powder and granule of DPA (2, 2-dichloropropionic acid) were also feasible for the control. However, in the case of spring treatment, additional application of paraquat (1, 1′-dimethyl-4, 4′-bipyridinium ion) is required one month after DPA treatment.
2. For the good control of the weed, the herbicide application is preferable either in spring after the sprouting of Sayanuka-gusa or in autumn before withering. It is not appropriate to treat the herbicides during irrigation period in paddy field since crop injury might occur.
3. A 1/100 glyphosate solution or 1/40 DPA solution can be applied from 500 to 1, 000 liter per hectare by high volume sprayers. DPA formulated as granular is spread onto the community of Sayanuka-gusa at rates of 100 to 150kg per hectare.View full abstractDownload PDF (547K) -
Goro HASHIMOTO1976 Volume 21 Issue 1 Pages 31-37
Published: July 25, 1976
Released on J-STAGE: December 17, 2009
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Kunikazu UEKI, Hiroshi HYAKUTAKE, Tadao YAMADA, Katsuyoshi NOGUCHI, Mi ...1976 Volume 21 Issue 1 Pages 38-44
Published: July 25, 1976
Released on J-STAGE: December 17, 2009
JOURNAL FREE ACCESSDownload PDF (961K)
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