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 73, Issue 1
Displaying 1-13 of 13 articles from this issue
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ESSAY
SPECIAL EDITION
TECHNO-TOPICS
RESEARCH ACTIVITIES
PAPERS (Articles)
RESEARCH PAPERS
  • Study of the Precision Farming with Soil Maps Describing Environmental Load Using a Real-time Soil Sensor
    Hiroki UMEDA, Sakae SHIBUSAWA, Tsuyoshi OKAYAMA, Denis Yukio SAKUMA, T ...
    2011 Volume 73 Issue 1 Pages 37-44
    Published: January 01, 2011
    Released on J-STAGE: April 24, 2013
    DOIhttps://doi.org/10.11357/jsam.73.37
    JOURNAL FREE ACCESS
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    In this study, we investigated the availability of information collected using a real-time soil sensor to create soil maps and using a yield meter mounted on a combine harvester to create yield maps, as part of a decision-making support system for precision agriculture. To create soil maps and yield maps, we have measured moisture content and total nitrogen of the soil in a wheat field using the real-time soil sensor before seeding and after harvesting. Yield maps were measured by a yield meter mounted on a combine harvester. Using these maps, we have investigated whether real-time soil sensor provides useful information for precision farming or not. In addition, we have calculated potential of environmental load of wheat cultivation by measuring total nitrogen loss from soil plow layer. According to our results, soil maps created by real-time soil sensor are useful for precision farming.
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  • Influence of Vibration Characteristics on Dynamic Behavior of Rolling Agricultural Tires
    Katsuhide FUJITA, Takashi SAITO, Mitsugu KANEKO
    2011 Volume 73 Issue 1 Pages 45-50
    Published: January 01, 2011
    Released on J-STAGE: April 24, 2013
    DOIhttps://doi.org/10.11357/jsam.73.45
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    Generally, agricultural tires have high and large cross-switch lugs to achieve optimal motion without slipping in a rice field. Therefore, when the agricultural machines run on normal roads, the vibration and noise caused by interaction between the tire lugs and the road surface are inevitable. In this study, a test equipment is manufactured to determine the motion of a rolling agricultural tire with ground contact and the characteristics of motion for rotational speed are investigated. Next, natural frequencies and natural modes of the tire are obtained by carrying out experimental modal analysis. By using the obtained results, the influence of vibration characteristics on the dynamic behavior of rolling tires are investigated.
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TECHNICAL PAPERS
  • Determination of Green Soybean (Edamame) Quality Using Near-Infrared Spectroscopy (Part 2)
    ——Constituent Content Determination of Green Soybeans with Pods——
    Hiroaki EGASHIRA, Motoyasu NATSUGA, Yoshie SUE, Takeshi IKEDA, Tomoya ...
    2011 Volume 73 Issue 1 Pages 51-56
    Published: January 01, 2011
    Released on J-STAGE: April 24, 2013
    DOIhttps://doi.org/10.11357/jsam.73.51
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    In part 1, we determined the eating quality-related constituents of green soybean seeds, such as sucrose and NRQ, using a commercial near-infrared (NIR) spectrometer and concluded that the accuracy was sufficient for field use. However, this requires a time-consuming hulling process that takes 15∼20 minutes. In order to eliminate this, we carried out an investigation using the same NIR spectrometer with a sample transport module for green soybeans with pods and obtained relatively good results with R2=0.57 and SECV=0.49% for sucrose, and R2=0.69 and SECV=0.21% for NRQ. The results were slightly less accurate than those of the seed calibration ; however, as this method does not require hulling and reduces the measuring time to approximately one fifth of that for seeds, we concluded that it is better for field use.
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  • Development of Automatic Seedling Feeding Mechanism for Grafting Robot for Cucurbits
    Ken KOBAYASHI, Momoko FUJII, Takahiro OHKOSHI
    2011 Volume 73 Issue 1 Pages 57-64
    Published: January 01, 2011
    Released on J-STAGE: April 24, 2013
    DOIhttps://doi.org/10.11357/jsam.73.57
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    We conducted research to develop a seedling feeding device that could be adapted to a semi-automatic grafting robot for cucurbits. After examining the possibility of cotyledon orientation using a fixed guide with a triangular protrusion in the plate center, we produced a basic prototype apparatus for automatically feeding seedlings and conducted a performance test. We found that cotyledon orienting using the fixed guide was possible if we use seedlings that were sown in an aligned pattern. If we targeted seedlings that emerged within 13mm of the cell center, we could achieve a seedling feeding success rate of 94%, though the basic prototype apparatus achieved only a 90% success rate. We thought that the accuracy could be improved by improving the seedling holding mechanism, the sowing method, and the raising methods of seedlings.
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MATERIAL
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