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Volume 68 (2006)
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Volume 68, Issue 2
Displaying 1-16 of 16 articles from this issue
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H. HORIO2006 Volume 68 Issue 2 Pages 1-2
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
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Kunio NISHIZAKI2006 Volume 68 Issue 2 Pages 4-8
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
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Takashi GOTOH2006 Volume 68 Issue 2 Pages 9-12
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
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Sumihiko MIYAHARA2006 Volume 68 Issue 2 Pages 13-16
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
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N. MURAKAMI2006 Volume 68 Issue 2 Pages 17-19
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
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M. TOMITA2006 Volume 68 Issue 2 Pages 20-21
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
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Image Processing and Paddy Field SensingKazunobu ISHII, Ryo SUGIURA, Tomohisa FUKAGAWA, Noboru NOGUCHI, Yoichi ...2006 Volume 68 Issue 2 Pages 33-41
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
JOURNAL FREE ACCESSThe objective of the study is to construct a sensing system for precision farming. A Multi Spectral Imaging Sensor (MSIS), which can obtain three images (G, R and NIR) simultaneously, was used for detecting growth status of plants. The sensor was mounted on an unmanned helicopter. An image processing method for acquiring information of crop status with high accuracy was developed. Crop parameters that were measured include SPAD, leaf height, and stems number. Both direct seeding variety and transplant variety of paddy rice were adopted in the research. The result of a field test showed that crop status of both varieties could be detected with sufficient accuracy to apply to precision farming.View full abstractDownload PDF (9099K) -
Wheat Growth Estimation and GIS Map GenerationRyo SUGIURA, Tomohisa FUKAGAWA, Yoshiyuki HARA, Kazunobu ISHII, Noboru ...2006 Volume 68 Issue 2 Pages 42-49
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
JOURNAL FREE ACCESSThe main objective of this research is to develop a remote sensing system that can determine crop status using a multi-spectral imaging sensor (MSIS). To detect crop information, high image quality is required under various ambient light conditions. Useful data was obtained by adjusting CCD gain before sensing and controlling exposure time for each capture. The unplanted ridges in the image makes the error of the vegetation cover rate. Therefore, the algorithm which can automatically segment the unplanted ridge area was developed. In this research, the images were obtained at flag leaves stage and flowering stage. The crop statuses were estimated by the multiple-linear regression of the sensing data and ground-truth data (SPAD value, crop height, stem number, dry weight, nitrogen contents and yield). As a result of the analysis, the coefficients of determination at the flag leaves stage were 0.72 (SPAD value), 0.59 (crop height), 0.58 (stem umber), 0.59 (dry weight), 0.62 (nitrogen contents) and 0.61 (yield). The coefficients of determination of SPAD value, nitrogen contents and yield at the flowering stage were 0.72, 0.62 and 0.54. However, the other parameters didn't show any correlation. Finally, the GIS maps regarding crop status were generated for the experimental field.View full abstractDownload PDF (6100K) -
Swapan Kumar ROY, Sakae SHIBUSAWA, Tsuyoshi OKAYAMA2006 Volume 68 Issue 2 Pages 50-62
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
JOURNAL FREE ACCESSThis paper describes the variations of soil moisture and organic matter using underground image textural indices and hyperspectral signatures. The image textural indices were extracted from video image data by a real-time soil spectrophotometer (RTSS), and hyperspectral signatures were recorded on a portable field spectrophotometer and an AISA airborne sensor for the wheat-growing season at TUAT field. In explaining the variation of soil properties, the neural network (NN) showed consistently outperformed stepwise multiple liner regression (SMLR) and provided minimal prediction errors for spatial soil properties. The result showed that significant improvement had occurred and indicated integrated field spectral signatures with image texture would be an appropriate required in this type of analysis.View full abstractDownload PDF (6220K) -
Effect of Operational Conditions on Milling ConditionsMotokatsu SUZUKI, Eiichiro SAKAGUCHI, Shotaro KAWAKAMI, Takeshi FUKUMO ...2006 Volume 68 Issue 2 Pages 63-68
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
JOURNAL FREE ACCESSAs the first step for applying discrete element simulation to the development of an abrasive-type rice milling technology, a two-dimensional model was developed using circular elements for the initial milling process. Rice particle movement was observed during milling in a test machine and the decrease in brown rice mass was measured. The simulation reproduced the characteristics of particle movement observed in the experiment. Simulated shear force between a particle and an abrasive roll governed the milling action. Shear force integrated over milling time correlated well with decreased particle mass. The simulation predicted the effect of surface roughness and rotational frequency of the roll on both particle movement and the decrease in mass observed experimentally.View full abstractDownload PDF (6141K) -
Slip Ratio Control Based on a Peak Search Method of the Driving ForceHiroyuki IMANISHI, Yogo TAKADA, Tomoyuki WAKISAKA2006 Volume 68 Issue 2 Pages 69-76
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
JOURNAL FREE ACCESSAs to agricultural vehicles, it is necessary to prevent tires from slipping when running on a ridge road. If electric motors are used to drive the wheels of an agricultural vehicle, it is easy to control the driving force of each wheel.
In this study, a traction control system with an original peak search method of the driving force was applied to an agricultural electric vehicle for improving vehicle stability. A simulation model for the power train of one of the driving wheels of an agricultural electric vehicle with the traction control system was composed and identified with a fixed experimental apparatus.
By numerical simulations, it has been confirmed that the slip ratio between a tire and a road can be kept at optimum states under very slippery conditions.View full abstractDownload PDF (891K) -
Case Study of Improvement of Animal Drawn Plow in MoroccoToshiyuki TSUJIMOTO, Hai SAKURAI2006 Volume 68 Issue 2 Pages 77-83
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
JOURNAL FREE ACCESSLarge agricultural machinery from European countries is not suitable for agricultural mechanization of the African regions, especially for small-scale farmers. Mechanization of small-scale farms in African countries must be economical.
Among the small-scale farmers in Morocco, there is much use of animal power on hilly terrain and slope areas, with problems of effective use of narrow places, farmers' suffering from heavy work and the pressure of time.
First, to improve the operational stability of animal power and labor conditions, an experiment was done in a field in Morocco in relation to the plowing performance of a new kind of plow. Traction force and the walking reduction rate for operational stability of this plow were analyzed.
Result showed that the draft resistance force of the improved animal-drawn plow for long landside in the experiment field was 731N, while the result for the walking reduction rate was 13%. The improved animal plow also showed the best result in operational stability.
Following this experiment, in the situation of C. C. (Cover Crop Cultivation) such as shallow plowing, widely practiced in Morocco, the evaluation by operators has been very good. They note that it is easily operated on long landside, and the improved plow is stable and causes less distress.View full abstractDownload PDF (11294K) -
Michihisa IIDA, Yong YAO, Atsushi KIMURA, Masahiro NISHIKORI, Mikio UM ...2006 Volume 68 Issue 2 Pages 84-87
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
JOURNAL FREE ACCESSThis paper describes the estimation of a mass of grain accumulated inside a grain tank using an ultrasonic sensor. The ultrasonic sensor measures the distance from tank ceiling to the top of the grain accumulated inside the tank. The coefficient of correlation between the distance measured by the ultrasonic sensor and the mass of grain was R=0.961. The range of resolution with the ultrasonic sensor is 5.3kg/cm. In addition, as the mass of grain depends on the moisture content, multiple regression analysis was adapted to estimate the mass of grain inside the tank with the distance and moisture content. The coefficient of correlation was R=0.986.View full abstractDownload PDF (2791K) -
Yoshiyuki HARA, Hideyuki TAKENAKA, Noboru NOGUCHI, Kazunobu ISHII2006 Volume 68 Issue 2 Pages 88-93
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
JOURNAL FREE ACCESSBoom sprayer is usually used in Hokkaido for chemical application of upland crops. We developed the application rate control system of boom sprayer in proportion to working speed by using RTK-GPS and the flow rate sensor. And an automatic boom opening and closing system, which works at every start and end of spraying was also developed for autonomous spraying. Using this sprayer and the robot tractor equipped with RTK-GPS and CAN-BUS, we did the verification of autonomous spraying system in sugar beet field. The autonomous running of tractor, application control system and boom control system of sprayer was smoothly activated. Thus, this system can enable an autonomous spraying.View full abstractDownload PDF (4570K) -
Labor Saving Technique for Welsh Onion Cultivation Using a Fertilizer Applicator-DitcherMitsuhiko KATAHIRA, Shou MURAKAMI, Hayato SHINDOU, Hiroyuki HAYASHI, S ...2006 Volume 68 Issue 2 Pages 94-99
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
JOURNAL FREE ACCESSA fertilizer applicator-ditcher saves labor and cultivation costs for welsh onion. Work using the fertilizer applicator-ditchers was compared with conventional in ando and sandy soils. This fertilizer applicator-ditcher had 736-mm-long moldboards. Ditches produced using this device were fit for welsh onion cultivation in both fields. Fertilizer placement using the device was 1cm deep and 4cm from the ditch center. Work using this device was 10 times faster than conventional work in the ando soil field and 13 times faster in the sandy soil field. Moreover, the land area coverage increased to 3.8-5.3 times that of conventional work. Yields obtained using this device resembled that for a conventional work in the ando soil field. However, top dressing was necessary to maintain an equivalent yield in the conventional section.View full abstractDownload PDF (2648K) -
Tadashi CHOSA, Masaaki OMINE, Hisashi HOSOKAWA, Yoichi SHIBATA2006 Volume 68 Issue 2 Pages 100-102
Published: March 01, 2006
Released on J-STAGE: November 19, 2010
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