Journal of Weed Science and Technology
Online ISSN : 1882-4757
Print ISSN : 0372-798X
ISSN-L : 0372-798X
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Volume 51, Issue 1
Displaying 1-4 of 4 articles from this issue
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Original Reports
  • Summer weed vegetation of road pavement seams in Route 4
    Yuko Suto, Yuki Takahashi, Masaru Ogasawara
    2006 Volume 51 Issue 1 Pages 1-9
    Published: March 20, 2006
    Released on J-STAGE: October 19, 2007
    DOIhttps://doi.org/10.3719/weed.51.1
    JOURNAL FREE ACCESS
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    Weed vegetation of road pavement seams was investigated at 68 points in the Route 4 (from Adachi, Tokyo to Aomori city, Aomori) from July 27 to July 30 in 2004. One hundred and two weed species belonging to 27 families were observed, and 44 naturalized weeds (43 %) were involved. The frequency of occurrence was high as following order of Digitaria ciliaris (85.3 %), Artemisia princeps (69.1 %), Taraxacum officinale (61.8 %) and Setaria viridis (60.3 %). In terms of life form, annual · bolochory · monophyte weeds were dominated. These results were similar to those from the investigation conducted in Utsunomiya City in 2002 and 2003. On the other hand, when weed vegetations of cool temperature region (7 points in Iwate Pref.) and warm temperature region (7 Points in Tochigi Pref., Saitama Pref. and Tokyo Met.) were compared, D. ciliaris and Eragrostis multicaulis were occurred with similar frequency and coverage at the both regions, however, T. officinale and Poa pratensis were abundant especially in the former, and S. viridis and Conyza sumatrensis in the latter.
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  • Effects of management practices for abandoned fields of shifting cultivation on their vegetation component and tree establishment in two hill tribes in Doi Inthanon National Park of Thailand
    Takayoshi Nishio, Mamoru Kanzaki, Masatoshi Hara, Tatsuhiro Ohkubo, Yo ...
    2006 Volume 51 Issue 1 Pages 10-18
    Published: March 20, 2006
    Released on J-STAGE: October 19, 2007
    DOIhttps://doi.org/10.3719/weed.51.10
    JOURNAL FREE ACCESS
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    The different outcomes for forest succession by the management practices of two hill tribes were examined around Doi Inthanon national park in northern Thailand. The study plot was set to compare floristic composition, spatial structure variation of weeds and tree establishment between fallows belonging to villages of hill tribes of Karen and Hmong, which were managed under different practices depending on the duration after abandoned, such as hand weeding, herbicide application, prescribed fire, pasturing and so on. In the fallows of Karen village, number of tree establishment were greatest in the plot under medium grazing pressure of water buffalo after 3 years from abandoned. In the fallows of Hmong village where pasturing was not practiced, and herbicides were applied to the cultivation fields, number of weed species and species diversity (H') of weeds were greatest in the plot after one year from abandoned among the plots. And the number of tree establishment in the fallows of Hmong village was quite fewer than that of the Karen village. It was inferred that the extensive agricultural practices in the Karen village promoted the tree establishment and the intensive agricultural practices in the Hmong village promoted the dominance of Imperata cylindrica causing delay in the tree establishment. In the Karen village Buffalo pasturing also seemed to be important to promote the tree establishment for forest recovery after shifting cultivation.
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  • Response of soybean cultivars to bentazon in the Tohoku region, Japan
    Masaaki Tachibana, Soichi Nakayama, Hiroaki Watanabe
    2006 Volume 51 Issue 1 Pages 19-27
    Published: March 20, 2006
    Released on J-STAGE: October 19, 2007
    DOIhttps://doi.org/10.3719/weed.51.19
    JOURNAL FREE ACCESS
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    The response of 24 soybean (Glycine max (L.) Merr.) cultivars to the post-emergence application of bentazon sodium salt was evaluated in the field in the Tohoku region, Japan. Sensitivity to bentazon varied widely among the soybean cultivars. Two old cultivars, ‘Shin No. 2’ and ‘Misao’, were the most sensitive to bentazon: they were killed upon applying bentazon at the 2-3 trifoliate leaf stage. Three cultivars, ‘Tachiyutaka’, ‘Yumeminori’ and ‘Shin No. 4’, were highly sensitive to bentazon: they showed such injury symptoms as yellowing and browning of leaves to which bentazon was applied, crinkling of the upper leaves, and defoliation. Other cultivars, including such popular soybean cultivars in the Tohoku region as ‘Suzukari’, ‘Suzuyutaka’, ‘Tachinagaha’, ‘Nanbushirome’, ‘Miyagishirome’ and ‘Ryuho’, were comparatively tolerant to bentazon. They showed only slight injury symptoms, such as discoloration of and brown spots on leaves. Severe injury led to soybean yield reduction. The reduction in soybean yield was correlated with the degree of growth suppression by bentazon at 20 DAA. The degree of injury of Tachiyutaka was increased with increasing solar radiation or sunshine duration on the day of bentazon application and the day after the application, and was greater on application at the 2-3 trifoliate leaf stage than on application at the 5-6 trifoliate leaf stage. Bentazon application to Tachiyutaka caused grain yield reduction, mainly because of the decrease in the number of mature pods. In the most severe injury case due to high solar radiation, the reduction in seed number per pod and pod number resulted in the greatest yield reduction of Tachiyutaka. Wet injury did not enhance bentazon injury of Tachiyutaka and Ryuho.
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Short Report
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