Journal of Weed Science and Technology
Online ISSN : 1882-4757
Print ISSN : 0372-798X
ISSN-L : 0372-798X
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Volume 54, Issue 3
Displaying 1-5 of 5 articles from this issue
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Original Reports
  • Effect of mulching of plant materials on the growth of ground cover plants and emergence of weeds on levee slope
    Ichirou Otani, Osamu Watanabe, Akihide Fushimi
    2009 Volume 54 Issue 3 Pages 129-138
    Published: 2009
    Released on J-STAGE: October 03, 2009
    DOIhttps://doi.org/10.3719/weed.54.129
    JOURNAL FREE ACCESS
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    Ground cover plants are useful for weed suppression on levee slopes. However, weeding is necessary until the slopes has covered with ground cover plants. In farm village, plant organic matter such as bark, chaff and wood chips are not used effectively. In order to elucidate the effects of the mulching of organic matter on levee slopes planted ground cover plants, the growth of ground cover plants and weeds were investigated. The number and dry weight on the emerged weeds in the organic matter mulch treatments were fewer than in the non-mulch treatments. The growth rates of ground cover plants (Eremochloa ophiuroides (Munro) Hack., Verbena tenera Spreng. and Phyla nodiflora L.) in crushed bark mulch treatment was equal with geotextile mulch treatment. On the slopes, the chaff and wood chips washed away by rain and wind, but the bark was stable. Therefore, it was thought that bark was suitable for mulch treatment at the slope. The number and dry weight emerged weeds which were mainly made from Echinochloa crus-galli and Digitaria adscendens were decreased 5cm in thickness by mulch treatment with the bark of Japanese cedar (Cryptomeria japonica) mixed with Japanese cypress (Chamaecyparis obtusa). On the slopes of levees mulched with bark composed of mixed Japanese cypress and cedar, the growth of weeds was suppressed, however, the growth of transplanted ground cover plants (E.ophiuroides, P.nodiflora and Thymus serpyllum L.), which spread over the bark, is not affect.
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  • Spatial structure of soybean-wheat/barley-weed community in soybean cultivation using barley/wheat as living mulch
    Namiko Yoshino, Hiroyuki Kobayashi, Tomoko Uchida, Yumi Shimazaki
    2009 Volume 54 Issue 3 Pages 139-146
    Published: 2009
    Released on J-STAGE: October 03, 2009
    DOIhttps://doi.org/10.3719/weed.54.139
    JOURNAL FREE ACCESS
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    The spatial structure of the soybean-barley/wheat-weed community was examined to verify the weed suppression capability of winter wheat/barley as living mulch for soybean cultivation. Both barley and wheat grew vigorously and their dry weights were 2-8 times as much dry weight as soybean at both 30 days and 50 days after sowing. The total LAI of soybean plus living mulch was 10 and 6 times higher than that of conventional soybean cultivation at 30 days and 50 days after sowing, respectively. The relative solar radiation on the whole soil surface was less than 10% in living mulch systems, but not less than 10%, even immediately below the soybean plants, in conventional soybean systems at 50 days after sowing. The dry weights of weeds in living mulch systems were less than a half weeds weight of conventional system in 30 days after sowing. The soybean growth was not affected by the growth of living mulch nevertheless the change of row width from soybean to living mulch. Results of this study clarified that the barley/wheat as living mulch grew much more rapidly than soybeans, consequently effectively controlled the weeds by shading.
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Short Report
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