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Volume 70, Issue 6
Displaying 1-14 of 14 articles from this issue
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T. UCHINO2008 Volume 70 Issue 6 Pages 1-2
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
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Tsutomu KAJIYAMA2008 Volume 70 Issue 6 Pages 4-7
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
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Eiko OTSU2008 Volume 70 Issue 6 Pages 8-11
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
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Hideyuki ICHIKI2008 Volume 70 Issue 6 Pages 12-17
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
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N. TSUKAMOTO2008 Volume 70 Issue 6 Pages 18-19
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
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H. FUKURO2008 Volume 70 Issue 6 Pages 20-25
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
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2008 Volume 70 Issue 6 Pages 26-38
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
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Local Features of Socio-economic Characteristics for Irrigated FarmingKhoune SACKBOUAVONG, Masayuki KOIKE, Tomohiro TAKIGAWA2008 Volume 70 Issue 6 Pages 59-68
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSThis paper deals with local socio-economic characteristics including production cost, household income, the characteristics of farming systems and some institutional aspects with specific reference to the development of farm mechanization. The profitability of rice cultivation at the study site has been discussed extensively. It can be pointed out that the net income per ha was too small to make the best use of machine power feasible on a household basis. The hiring of labor from neighboring farmers or requesting contract-hire services has popularly been done in the form of conventional farming practices. After a standstill in the use of draft animals, farmers laid aside farming implements, excluding small farming tools. Although irrigated farming systems were practiced, cultivating and harvesting operations still partly followed the traditional cooperative methods involving human labor. This was likely based on the insufficient availability of mechanized power. The issues related to the institutional aspects of farming also involved the further acceleration of technology dissemination.View full abstractDownload PDF (4329K) -
Changes in Eating Quality of Milled Rice during StorageMio YOKOE, Shuso KAWAMURA2008 Volume 70 Issue 6 Pages 69-75
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSSensory tests were conducted on samples stored at different temperatures for determining shelf life (best before date) of milled rice. The results of sensory tests were considered to be the most appropriate indicator for determining the best before date because quality changes could be detected more sensitively by sensory tests than by physicochemical measurements. The results of sensory tests indicated that the best before dates of milled rice (conventional milled rice and rinse-free rice) stored at 25°C, 20°C, 15°C and 5°C were two months, three months, five months and seven months, respectively.View full abstractDownload PDF (1067K) -
A Novel Research on Coconut Field Application Using Laser ScannerOscar C. BARAWID Jr., Rahman FARROKHI TEIMOURLOU, Noboru NOGUCHI, Kazu ...2008 Volume 70 Issue 6 Pages 76-84
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSThe research objective was to develop an automatic guidance system in a real-time coconut field application using a laser scanner. Seven methods were used in this research, data and information gathering, tree row recognition using Hough transform, masking method to get the ROI (region-of-interest), simulated coconut environment, SMA (simple moving average), steering control algorithm, and experimental test runs. This research dealt with the recognition of tree rows as a straight line, to be followed by the robot tractor in real-time coconut field straight path navigation.View full abstractDownload PDF (9331K) -
Satoru SAKAI2008 Volume 70 Issue 6 Pages 85-89
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSThis paper proposes an evaluation index of global performance for agricultural robots. In general, it is not feasible to apply the theoretical field capacity to agricultural robots that have a high degree-of-freedom mechanism and high level of interaction with the working environment. In this paper, a macroscopic environmental model is first proposed. Second, fundamental equations of the working space and the working time are derived based on the environmental model and a normative task plan. Third, a new evaluation index is proposed based on these fundamental equations. The proposed index, which extends theoretical field capacity, is confirmed to be effective for evaluation of the performance of agricultural robots.View full abstractDownload PDF (929K) -
Baoming SHEN, Tadatoshi SATOW, Kazunori HIRONAKA, Shu-Huai ZHANG2008 Volume 70 Issue 6 Pages 90-96
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSThe purpose of this study was to develop a laser crop row sensor (LCRS) by which an automatic guidance system might be developed. The LCRS consisted of a laser displacement sensor and a motor-driven six-face polygon mirror. The sensor measured section height of crop row without contact, while the horizontal position of the crop row was calculated by a computer. In the laboratory experiments, the LCRS could detect the position of model crops set at a low horizontal plane within a lateral range of 180mm, with a coefficient of determination of more than 0.99. Moreover, the LCRS could follow the crop rows accurately enough with the working speed range of 0.5-1.5m/s in field experiments. The RMS error of positional detection was at most 22.6mm when the working speed was 1.0m/s.View full abstractDownload PDF (1057K) -
Mitsuyoshi SHIMAZU, Youichi SHIBATA, Tadashi KISHIMOTO, Chunfeng ZHANG ...2008 Volume 70 Issue 6 Pages 97-104
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSTo estimate the optimum harvest time and to predict the crop yield with meteorological data, a measurement system for the growth of a sugar beet accurately and nondestructively was attempted to develop. The system which measures the root diameter with transducer in the soil is designed and made on an experimental basis. Measurement accuracy with two transducers was higher than with one for one sugar beet. The influence of the external disturbances was little to the system. Shrinkage and expansion in root growth and the blunting of root swelling at the end of growth were measured. Accumulation and analysis of measured data have possibility to estimate the optimum harvest time and to predict the crop yield accurately.View full abstractDownload PDF (7624K) -
Masateru YAMASHITA, Ken TANIWAKI, Yutaka KANETANI, Aiko MITSUSE2008 Volume 70 Issue 6 Pages 105-111
Published: November 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSExperiments were conducted to determine the effects of electric field and cold shock treatments on imbibition and germination of black soybean seeds. Their applications to bean sprouts and other sprout products were also investigated. The application of electric field (field intensity, 333kV/m) treatment after having performed cold shock (-20°C, 24h) treatment reduced both the imbibition rate 30min after imbibition started and the protein leakage rate to half those of the untreated seeds. Furthermore, five days after imbibition started, the hypocotyl length increased by 139.9% compared with that of the untreated seeds after the combined treatment applications. These results suggest that the application of electric field treatments after having performed cold shock treatment to black soybean seeds reduces the destruction of the internal parts of the seeds caused by rapid imbibition, stabilizing the early stage imbibition rate and promoting postgermination growth.View full abstractDownload PDF (3718K)
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