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 2
Displaying 1-13 of 13 articles from this issue
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ESSAY
SPECIAL EDITION
TECHNO-TOPICS
RESEARCH ACTIVITIES
PAPERS (Articles)
RESEARCH PAPER
  • Development of Mapping System for Grass Yield Using Hyperspectral Imaging
    Yumiko SUZUKI, Hiroshi OKAMOTO, Katsuyuki TANAKA, Takashi KATAOKA, You ...
    2011 Volume 73 Issue 2 Pages 115-126
    Published: March 01, 2011
    Released on J-STAGE: April 24, 2013
    DOIhttps://doi.org/10.11357/jsam.73.115
    JOURNAL FREE ACCESS
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    A system was developed to map the yield of grass using hyperspectral imaging. First, the yield was estimated by fitting the spectrum of each pixel in the hyperspectral image to an estimation model of the yield. And then, the estimation yield map was created at a suitable spatial resolution calculated by semivariance analysis. The estimation models were developed using four analysis methods, and the PLSR (Partial Least Squares Regression analysis) model indicated good potential for the estimation of the yield. The model validation result showed that the coefficient of determination was 0.418, the standard error of cross validation was 0.077t/10a and the relative error was 0.218. The estimation map of the yield reflected spatial distribution of the actual yield relatively.
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TECHNICAL PAPERS
  • Development of Green Soybean Sorting Method Using Image Processing (Part 2)
    ——Evaluation of Green Soybean Sorting Machine Prototype Performance——
    Mitsuhiko KATAHIRA, Shuhuai ZHANG, Takahiro OHIZUMI, Tsu-neyoshi GOTOU ...
    2011 Volume 73 Issue 2 Pages 127-134
    Published: March 01, 2011
    Released on J-STAGE: April 24, 2013
    DOIhttps://doi.org/10.11357/jsam.73.127
    JOURNAL FREE ACCESS
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    We developed a green soybean sorting machine prototype to improve the efficiency of green soybean processing. Image processing and transparency images were used to identify damage to green soybean pods, and investigate its sorting accuracies. The green soybean sorting machine prototype was 1700mm long, 500mm wide, and 1500mm high, comprising two conveyer belts, an arranging and transportation mechanism, finder units, processing units, and a separation system. The arranging and transportation mechanism, which comprises an arranging roller, some arranging rolls and transportation guides, produced the most stable green soybean transport posture among all types. The green soybean sorting machine prototype, which included that mechanism, showed a five-fold higher sorting rate than manual sorting. Finder units comprising image processing units and fiber sensor units detected seed maturity and green soybean damage that produced color change points in the pods. When putting the pods on a conveyer belt one-by-one at a laboratory, sorting accuracy (η) indexes of the green soybean sorting machines prototype were, respectively, 0.51 for the finder unit, and 0.80 for the fiber-sensor accuracy (ηs), and 0.66 for the image processing unit accuracy (ηi). Sorting tests at a production center were 0.11 at the average η because of effects on degradation for the transport posture and smaller damaged areas of pods. Nevertheless, this green soybean sorting machine prototype was judged as having 0.75 sorting accuracy for good pods (ηa), which was similar to manual sorting : 63-81% judged as good pods (WgPg).
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  • Effects of Nanosecond Pulsed Electric Fields on Agricultural Product
    ——Cell Morphology of Grape Skin after High Electric Fields Treatment and Total Polyphenols of Transudate——
    Hitoshi HATAYAMA, Shoji KOIDE, Katsuyuki TAKAHASHI, Yukio KAWAMURA, Ko ...
    2011 Volume 73 Issue 2 Pages 135-141
    Published: March 01, 2011
    Released on J-STAGE: April 24, 2013
    DOIhttps://doi.org/10.11357/jsam.73.135
    JOURNAL FREE ACCESS
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    Feasibility of applying a nanosecond band pulsed electric fields (nPEF) to agricultural process was considered. We developed a set of equipment for measurement : first was a nanosecond pulsed power generator whose pulse width was fixed at around 140ns ; second was a needle-to-plate electrode reactor. Grape skin was immersed in the electrode reactor filled with distilled water. It was treated with nPEF and the cell morphological changes were observed by using a microscopy. In addition, the total polyphenols in the transudate due to nPEF treatment was measured. Results showed that many anthocyanoplasts in cells were collapsed, and there was a remarkable increase in total polyphenols in the transudate under high voltage conditions. It was suggested that a decrease in pulses per second (pps) could treat the sample with less temperature rise.
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  • Hardness and Brix’s Changes of Internodes and Extraction Characteristics of Chopped Sweet Sorghum
    Xiaozheng SUN, Nobuki YAMANA, Makoto DOHI, Noboru NAKATA
    2011 Volume 73 Issue 2 Pages 142-147
    Published: March 01, 2011
    Released on J-STAGE: April 24, 2013
    DOIhttps://doi.org/10.11357/jsam.73.142
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    The extraction characteristics of internodes and chopped materials of sweet sorghum were investigated using a tension-meter and a compression testing machine in order to determine the optimal harvest-time, and extract sweet sorghum efficiently. The hardness and Brix value of sweet sorghum internodes increased from 15 weeks after sowing, and peaked at 16 to 17 weeks after sowing, decreased after that. Sweet sorghum should be harvested and extracted at 16 to 17 weeks after sowing, considering Brix change. A better linear logarithmic relation existed between pressure and juice extraction ratio (juice mass to input mass), and the energy efficiency of thin materials was higher than that of thick materials when chopped sweet sorghum was extracted.
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  • Study on a Physical Pest Control Method in Greenhouses
    ——Effect of Airflow on Behavior of Diamondback Moth for an Insect-Capture Machine——
    Hidefumi SAITOH, Masahiro MIYAZAKI, Suguru YAMANE, Mitsuyoshi TAKEDA, ...
    2011 Volume 73 Issue 2 Pages 148-155
    Published: March 01, 2011
    Released on J-STAGE: April 24, 2013
    DOIhttps://doi.org/10.11357/jsam.73.148
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    In order to develop a physical control of insect pests using airflow, we investigated the effect of airflow conditions on the removal of diamondback moth (Plutella xylostella (L.)) by using a wind tunnel test. The removal rate of the asphyxial adult moth was 100% in both the vertical and horizontal airflow at the velocity of 3.5m/s. To remove all adults adhering to the wire mesh, it took 2s in the vertical airflow and 6s in the horizontal airflow at the velocity of 20m/s. In the vertical airflow, the capture rate of flying adults at the air velocity of 3m/s was 100%. In the horizontal airflow, the capture rate was 60%. In the airflow, the larvae avoided removal by dangling from thread, and it was more difficult to remove the larvae than the adults. The removal rate of larvae at the air velocity of 20m/s was 70% in the vertical airflow, and 50% in the horizontal airflow.
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