Root Research
Online ISSN : 1880-7186
Print ISSN : 0919-2182
ISSN-L : 0919-2182
Current issue
Displaying 1-2 of 2 articles from this issue
Original Paper
  • Toshikazu KURANOUCHI, Akiko TAKADA, Toshiro FUJITA, Kenji KATAYAMA, Mi ...
    2022 Volume 31 Issue 3 Pages 83-89
    Published: September 20, 2022
    Released on J-STAGE: September 26, 2022

    The effects of mulch ridge covering during sweetpotato cultivation for “hoshi-imo” steamed and dried slices on soil moisture, properties of sweetpotato tuberous roots, and processing characteristics were investigated for five years by late planting in four treatment plots: mulch ridge covering plot, removal plot one month before harvest, removal plot two months before harvest, and no mulch plot. It was confirmed that the variation of soil moisture content in the ridge caused by rainfall and drying was suppressed by covering the ridge with polyethylene mulch during sweetpotato cultivation. In the late planting culture, the yield of tuberous root was increased by the mulch ridge covering. The dehiscence rate of “Tamayutaka” without mulch was significantly higher than that of other test plots, and it was considered that the dehiscence rate was lower by mulch ridge covering in the initial growth stage. And, in “Tamayutaka”, the increase of the dehiscence was recognized in the year with much soil moisture, but this tendency was not recognized in “Hoshikogane”. The texture of the “hoshi-imo” tended to be the most viscous in the non-mulching plot, and it was indicated that the texture of the “hoshi-imo” became a little viscous when the mulching coating was removed about 2 months before the harvest. However, when it was removed about one month before harvest, the effect on the texture of the “hoshi-imo” seemed to be small.

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  • Yusuke NAKAI, Shin-ichi WATANABE
    2022 Volume 31 Issue 3 Pages 90-97
    Published: September 20, 2022
    Released on J-STAGE: September 26, 2022

    Microplastics constitutes one of the serious marine environmental problems. In many cases, polyurethane resin, which is a type of plastic, is commonly used as a growth medium in sprout production. Consequently, industrial waste composed of a mixture of polyurethane media and roots would also contribute to marine microplastic pollution. Because of that, it was necessary for us to examine polyurethane resin replacement as a new medium and we focused on recyclable wood pulp medium prepared from lumber. This study aimed to evaluate the growth of roots and shoots of tartary buckwheat (Fagopyrum tataricum Gaertn.) sprouts on a wood pulp medium in a closed plant factory under artificial light. Total root length, longest root length, root length density, specific root length, bleeding sap rate, fresh weight of shoots, hypocotyl length, and fresh and dry weight of roots were significantly greater when grown on wood pulp medium than on polyurethane medium. In addition, wood pulp medium could retain 3.89 times the amount of water compared with polyurethane medium. Furthermore, the three-phase distribution (gas, solid, and liquid phases) of wood pulp medium was improved compared with that of polyurethane medium. Conversely, dry weight of shoots did not differ significantly between wood pulp medium and polyurethane medium conditions. These results suggest that wood pulp medium may promote growth of tartary buckwheat sprouts in a closed plant factory with artificial light.

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