Japanese Journal of Grassland Science
Online ISSN : 2188-6555
Print ISSN : 0447-5933
ISSN-L : 0447-5933
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Displaying 1-11 of 11 articles from this issue
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Research Paper
  • Extremely Early Maturing and High Digestibility of Rye (Secale cereale L.) Lines Bred in Shinshu University
    Mai Kitahara, Yuriko Imai, Yuka Kawai, Kousuke Osanai, Taira Sekine, S ...
    2025 Volume 71 Issue 1 Pages 1-4
    Published: April 23, 2025
    Released on J-STAGE: May 15, 2025
    DOIhttps://doi.org/10.14941/grass.71.1
    JOURNAL RESTRICTED ACCESS
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    The Shinshu University rye breeding team, to which the authors belong, has developed two extremely-early-maturing lines, ‘SUR-10’ and ‘SUR-12’. The purpose of this study was to compare their feed composition characteristics with commercial varieties of the same maturity. From the field tests for two consecutive seasons from 2018-2019, the two lines were found to show: (1) earlier maturity than any commercial varieties, (2) lower plant height, (3) lower OCW, (4) equivalent or higher values in Oa/OCW, enzymatic digestible OM (EDOM=OCC+Oa) of digestible components, and estimated TDN content, suggesting that the two lines have better feed characteristics than conventional varieties of the same maturity. In the future, the two lines will be introduced widely to improve not only feed productivity but also quality in double cropping systems in some Japanese regions.

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Short Report
  • Shrub Removal in Abandoned Farmlands Using a Radio-controlled Hammer Knife Mower and a Hand-held Brush-cutter Fitted with Shredder Blade
    Hidetoshi Kakihara, Nariyasu Watanabe, Kiyoshi Hirano, Michio Tsutsumi
    2025 Volume 71 Issue 1 Pages 5-8
    Published: April 23, 2025
    Released on J-STAGE: May 15, 2025
    DOIhttps://doi.org/10.14941/grass.71.5
    JOURNAL RESTRICTED ACCESS
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    The performance of a radio-controlled hammer knife mower and a hand-held brush-cutter fitted with a shredder blade for shrub removal was evaluated to effectively restore shrub-encroached abandoned farmlands. To determine the shrub removal rates (effective field capacities) of these machines, two sets of three experimental plots, each measuring 1.5 m×20 m for the hammer knife mower and 1.0 m×10 m for the brush-cutter, were established in a field dominated by multiflora rose (Rosa multiflora Thunb.). The vegetation height and slope gradient of experimental plots was 124±15 cm and 4.4±1.7° for the hammer knife mower and 118±21 cm and 3.4±1.5° for the brush-cutter, respectively. The shrub removal rate of the hammer knife mower was 1,894 m2/h, which is higher than that of the brush-cutter with circular saw blade (conventional method). The removal rate of the brush-cutter with shredder blade (131 m2/h) was tended to be higher than that of the conventional method. These results demonstrate that both machines can improve the efficiency of shrub removal operations in abandoned farmlands.

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Practical Report
Special Features
On-site Demonstration of Smart Agricultural Technologies for Grazing Management
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