JOURNAL of the JAPANESE SOCIETY of AGRICULTURAL MACHINERY
Online ISSN : 1884-6025
Print ISSN : 0285-2543
ISSN-L : 0285-2543
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Volume 75, Issue 2
Displaying 1-9 of 9 articles from this issue
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ESSAY
SPECIAL EDITION
TECHNO-TOPICS
PAPERS (Articles)
RESEARCH PAPER
  • Wind-proof Seedbed for Reducing Wind Damage at Early Germination Stage of Direct Sowing Sugar Beet
    Hideyuki ICHIKI, NGUYEN Van Nang, Keita YOSHINAGA, Masahiro MIYAZAKI, ...
    2013 Volume 75 Issue 2 Pages 89-99
    Published: March 01, 2013
    Released on J-STAGE: December 03, 2014
    DOIhttps://doi.org/10.11357/jsam.75.89
    JOURNAL FREE ACCESS
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    Seedlings of direct sowing sugar beet cultivation are vulnerable to wind injury in the early stage of germination. Seedbeds prepared to shelter the young seedlings from strong wind are a possible wind-damage countermeasure. In the present study, effect of a wind-proof seedbed that has Λ-shaped ridges at both sides of the sowing position on wind proofing was examined by wind tunnel tests. Measurements were made of vertical wind velocity profile using hot-wire method, and of wind velocity vector using particle image velocimetry (PIV) technique in the vicinity of a wind-proof seedbed model. Wind flow characteristics above the seedbed were also modeled and simulated by Computational Fluid Dynamics (CFD) modeling. Based on the measured and simulated data, a seeder-mounted ridger was developed which can form the wind-proof seedbed with the Λ-shaped ridges with height of 5 cm. Field tests were conducted to measure and compare the wind velocity at different heights above the sowing position of the wind-proof seedbeds and conventional seedbeds. Test results showed that the wind velocity at an elevation of 1 cm above the sowing position of the wind-proof seedbed was reduced by 60 % in comparison with that of the conventional seedbed.
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TECHNICAL PAPER
  • Development of Automatic Seedling Feeding Device for Cucurbits Grafting Robot (Part 1)
    ——Evaluation of Automatic Stock Feeder——
    Takahiro OHKOSHI, Ken KOBAYASHI
    2013 Volume 75 Issue 2 Pages 100-107
    Published: March 01, 2013
    Released on J-STAGE: December 03, 2014
    DOIhttps://doi.org/10.11357/jsam.75.100
    JOURNAL FREE ACCESS
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    A study was conducted to develop a hig-efficiency automatic seedling feeder compatible with semi-automatic grafting robot for cucurbits. For continuous picking out seedlings from cell trays intermittently fed via a conveyor, an automatic stock feeder was fabricated and subjected to performance testing, the results of which demonstrated the feasibility of automatic feeding of aligned stock. No significant difference on the accuracy of seedling feeding was found in all varieties of pumpkin and bottle gourd. Its seedling divider allowed 100 % removal of seedlings inclined up to 80° in the positive X direction, 65° in the negative X direction, 70° in the negative Y direction and 35° in the positive Y direction, showing much greater flexibility than conventional models.
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