Japanese Journal of Farm Work Research
Online ISSN : 1883-2261
Print ISSN : 0389-1763
ISSN-L : 0389-1763
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Volume 35, Issue 2
Displaying 1-3 of 3 articles from this issue
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  • Wholesale harvest of vegetable jute (Corchorus olitorius L.) as a labor-saving measure
    Tatsuo SATO, Jiro NARIMATSU
    2000 Volume 35 Issue 2 Pages 69-76
    Published: June 20, 2000
    Released on J-STAGE: February 09, 2010
    DOIhttps://doi.org/10.4035/jsfwr.35.69
    JOURNAL FREE ACCESS
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    To reduce the amount of labor needed to harvest vegetable jute (Corchorus olitorius L.), wholesale harvest with dense planting was examined. In this harvest method, the cutting position was fixed on a horizontal plane. Workers could use scissors at a constant height to minimize movement. As a result, by transplanting at a density of 119 plants per square meter, the marketable yield was reduced by 12%, the required time for harvest was reduced by 63%, and the marketable yield per working hour increased by 140% when compared with the values obtained by a conventional multiple harvest. By direct sowing at a density of 135 plants per square meter, the marketable yield was reduced by 28%, the required time for harvest was reduced by 87%, and the yield per working hour was increased by 442% of the values obtained by a conventional multiple harvest. Harvested leaves were soft and showed a high-quality color.
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  • A New Index to Evaluate Farm Workload by Using the Heart Rate of Step-stress Test
    Haochun JIN, Naotaka HAYASHI, Shoji MORIIZUMI
    2000 Volume 35 Issue 2 Pages 77-87
    Published: June 20, 2000
    Released on J-STAGE: February 09, 2010
    DOIhttps://doi.org/10.4035/jsfwr.35.77
    JOURNAL FREE ACCESS
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    The purpose of this study is to develop a new method for evaluating workload by comparing the ratio of working heart rate (HRw) to the heart rate of the step-stress test (HRst). We carried out two experiments. In the first experiment, the heart rate and the volume of oxygen consumption (VO2) were measured while a subject carried a 10kg box at 3km/h on a treadmill. In the second experiment, HR and VO2 were recorded while a subject shoveled 1.7-2.2kg of soil at a time and moved it about 1.5m.
    The results were as follows:
    1) In both experiments, interpersonal variation and drift (variations in an individual) of the resting HR were larger than those of the step-stress test and work. The HR values in the rest period were easily effected by mental stress.
    2) In the first experiment, the variations of HR and VO2 among individuals were larger than the drift. The interpersonal variation and drift of VO2 were also larger than those of the HR.
    3) The coefficient of interpersonal variation (4.8-5.4%)of the HR ratio (HRW/HRST) based on the step-stress test was smaller than the coefficient of resting HR (10.1-11.6%).
    4) In both experiments, the coefficients of interpersonal variation for VO2 per unit weight in work ranged from 6.6-19.4%. In contrast, the coefficients of the relative metabolic rate showed large values ranging from 17.6 to 31.5%.
    5) These results prove that the HR ratio based on the stepstress test is much better than conventional indexes for evaluating workload.
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  • Abstract of the 35th Meeting
    2000 Volume 35 Issue 2 Pages 95-113
    Published: June 20, 2000
    Released on J-STAGE: February 09, 2010
    DOIhttps://doi.org/10.4035/jsfwr.35.95
    JOURNAL FREE ACCESS
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