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 74, Issue 2
Displaying 1-12 of 12 articles from this issue
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ESSAY
SPECIAL EDITION
TECHNO-TOPICS
RESEARCH ACTIVITIES
PAPERS (Articles)
TECHNICAL PAPERS
  • Elucidation of the Appropriate Working Condition for Using a Soil-Removal Type Subsoil Breaker on Heavy Clay Soil in Okinawa
    Koichiro FUKAMI, Mituho SUGIMOTO, Yoshiyuki SHINZATO, Tohru AKACHI
    2012 Volume 74 Issue 2 Pages 115-122
    Published: March 01, 2012
    Released on J-STAGE: September 19, 2013
    DOIhttps://doi.org/10.11357/jsam.74.115
    JOURNAL FREE ACCESS
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    We performed traction resistance measurement tests to elucidate the appropriate working condition for using a soil-removal type subsoil breaker (Plowsoiler; SUGANO Co. Ltd., hereafter in this study, this subsoil breaker will be referred to as “soil-removal type”) on Jahgaru soil, which is a type of a heavy clay soil found in Okinawa. The traction resistance measurement tests were performed using 2 types of soils (Jahgaru and Andisol) and 2 types of implements (a soil-removal type subsoil breaker and a subsoiler). Our results showed the traction resistance was increased exponentially with an increase in the depth. The average traction resistance of the soil-removal type subsoil breaker at the average work depth of 45-50 cm was approximately 20% and 40-50% in the Andisol and Jahgaru soils respectively; these values were observed to be lower than those obtained using the subsoiler. On the Jahgaru soil, tractor pitching increased linearly with an increase in the work speed of the subsoil breaker.
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  • Performance and Effects on Soybean Cultivation of Disk Cultivator-Ridger (Part 1)
    ——Comparison of Work Efficiency, Power Requirements and Fuel Consumption with Rotary Cultivators——
    Takashi GOTOH, Tsukasa TESHIMA, Yukito FUJII, Norio NAGASAWA, Masahiro ...
    2012 Volume 74 Issue 2 Pages 123-130
    Published: March 01, 2012
    Released on J-STAGE: September 19, 2013
    DOIhttps://doi.org/10.11357/jsam.74.123
    JOURNAL FREE ACCESS
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    The problems of rotary cultivators that are widely used in Japan for inter-row cultivating and earthing up are soil kneading under wet soil conditions and low travel speed. To improve these problems, we have developed disk cultivator-ridgers. With these machines, inter-row soil is turned over laterally by the revolution of the disks and consequently inter-row cultivating and earthing up are performed. The work rate, power requirements and fuel consumption of disk cultivator-ridgers were investigated in comparison with those of rotary cultivators. The following results were obtained. (1) At a fixed travel speed of 1.2 m/s for the disk cultivator-ridgers and 0.65 m/s for the rotary cultivators, the effective field capacity of the disk cultivator-ridgers was 72-95 a/h, 1.7-1.9 times that of the rotary cultivators. (2) A comparison of commonly used travel speeds, 1.0-1.6 m/s for the disk cultivator-ridger and 0.5-0.8 m/s for the rotary cultivator, revealed that although the power requirements of the disk cultivator-ridgers were almost the same as those of the rotary cultivators, the energy requirements and the fuel consumption of the disk cultivator-ridgers were almost half those of the rotary cultivators.
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  • Performance and Effects on Soybean Cultivation of Disk Cultivator-Ridger (Part 2)
    ——Comparison of Effects on Trafficability, Soil Pulverizing Performance and Earthing up Performance with Rotary Cultivators——
    Takashi GOTOH, Tsukasa TESHIMA, Yukito FUJII, Norio NAGASAWA, Masahiro ...
    2012 Volume 74 Issue 2 Pages 131-139
    Published: March 01, 2012
    Released on J-STAGE: September 19, 2013
    DOIhttps://doi.org/10.11357/jsam.74.131
    JOURNAL FREE ACCESS
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    The effects on trafficability, soil pulverizing performance and earthing up performance of disk cultivator-ridgers were investigated 30 times in five fields planted with soybean in comparison with rotary cultivators. The following results were obtained. (1) In wet soil conditions, we observed over 30% slippages of the tractor installed with a disk cultivator-ridger and an up-cut rotary cultivator. (2) The soil pulverizing performance of a disk cultivator-ridger in wet soil conditions was better than that of a down-cut rotary cultivator installed with earthing up ridgers, and was almost the same as that of an up-cut rotary cultivator. (3) Although there was no significant difference in optimal earthig up rate, the rate of buried soybean plants and rate of lodged soybean plants between the disk cultivator-ridger and the rotary cultivator, earthing up performance near the plants of the disk cultivator-ridger was better than that of the rotary cultivator.
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  • Performance and Effects on Soybean Cultivation of Disk Cultivator-Ridger (Part 3)
    ——Comparison of Weed Burial and Weed Protective Performance with Rotary Cultivators——
    Takashi GOTOH, Tsukasa TESHIMA, Yukito FUJII, Norio NAGASAWA, Masahiro ...
    2012 Volume 74 Issue 2 Pages 140-146
    Published: March 01, 2012
    Released on J-STAGE: September 19, 2013
    DOIhttps://doi.org/10.11357/jsam.74.140
    JOURNAL FREE ACCESS
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    A weed burial performance comparison and weed protection performance comparisons were carried out between disk cultivator-ridgers (D) and rotary cultivators (Rm, R) in an unplanted field and in five fields planted with soybean. The following results were obtained. (1) The burial rate of mock weeds was 91 % for D and a down-cut rotary cultivator installed with earthing up ridgers (Rm), and 82 % for an up-cut rotary cultivator (R). (2) The inter-row weeds in the D-D plots were 50 % reduced in terms of dry weight and 35 % lower than R-Rm plots, and 45 % lower than R-R plots. (3) The intra-row weeds in the D-D plots were 40 % reduced in terms of dry weight and 45 % lower than those in the R-Rm plots, and 45 % reduced in terms of dry weight and 55 % lower than those in the R-R plots.
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  • Performance and Effects on Soybean Cultivation of Disk Cultivator-Ridger (Part 4)
    ——Comparison of Effects on Soil Physical Properties, Growth and Yields of Soybean with Rotary Cultivators——
    Takashi GOTOH, Tsukasa TESHIMA, Yukito FUJII, Norio NAGASAWA, Masahiro ...
    2012 Volume 74 Issue 2 Pages 147-155
    Published: March 01, 2012
    Released on J-STAGE: September 19, 2013
    DOIhttps://doi.org/10.11357/jsam.74.147
    JOURNAL FREE ACCESS
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    Eleven investigations of soil physical properties and thirteen investigations into the growth and yield of soybean were performed after twice cultivating-ridging using disk cultivator-ridgers (D) and rotary cultivators (Rm, R) in five fields planted with soybean. The following results were obtained. (1) When cultivating-ridging in wet soil conditions, the solid phase rate of the surface layer soil in the D-D plots before soybean harvesting was 0.95 times, that in the R-Rm plots, and 0.98 times in the R-R plots. The moisture content of the above-mentioned soil conditions in the D-D plots was 1.1 times that in the R-Rm plots. (2) For cultivating-ridging in wet soil conditions, the soybean yield in the D-D plots was 15 % higher than that in the R-Rm plots.
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