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Volume 34 (1999)
- Issue 4 Pages 231-
- Issue 3 Pages 177-
- Issue 2 Pages 77-
- Issue 1 Pages 3-
Volume 34, Issue 1
Displaying 1-5 of 5 articles from this issue
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Huimin WU, Yoshinobu OTA, Takashi KATAOKA1999 Volume 34 Issue 1 Pages 3-12
Published: March 10, 1999
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSWorking area and cost were discussed based on 3 composed mechanized equipment levels in case that a cooperative method for grass harvesting work will be used by several small scale dairy farms. Coverage and working cost for forage grass around Morioka city in a suitable harvesting period were calculated. Selection of grass harvesting system and its productivity were also discussed according to profitable working area by comparing the advantages in case of changing the annual working proportion of wrap grass silage and hay harvesting. The results are as follows.
1) For the same mechanized equipment level, the working cost of the hay harvesting system was lower than that of the wrap grass silage system. However, the difference of cost between the two systems decreased with increasing working area.
2) For the estimated working area based on the number of available working cycle in a suitable harvesting period for the forage grass around Morioka, the working cost was separated into grass cultivating cost and harvesting cost for discussion. Differences among the 3 mechanized equipment levels were small for the grass cultivating cost but large for harvesting cost at the same working area. Total working costs for the coverage of each mechanized equipment level were about 210, 000yen/ha.
3) The profitable working area of mechanized equipment I, II and III which are shown in Table 1 for the combination of the wrap grass silage (for first grass and third grass) and the hay harvesting (for second grass) were 9, 12 and 16 ha respectively. If the weather is good, it is more profitable to change the wrap grass silage method into the hay harvesting method.View full abstractDownload PDF (1145K) -
Katsumi TOYOKAWA1999 Volume 34 Issue 1 Pages 13-22
Published: March 10, 1999
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSThe posture and heart rate of 7 chiansaw men were investigated. The results obtained are as follows.
1) By Ovako Working Posture Analysis System, 82% of the posture of worker were classified into the operation under moderate work load, but 12% of that were classified into the operation under heavy burden. The posture under heavy burden appeared the operation of felling, i. e. undercutting and backcutting.
2) The work intenity level equaled moderate physiological loads from the increasing rate of chainsaw men's heart rate, but the level of the % HRmax on older worker equaled or was over the upper limit of physical work capacity in 8 hours work. The higher heart rate appeared in the felling, the wedge driving and the walking with chainsaw on slope. Judging from the % HRmax, the optimum time in one continuous work and one rest would be estimated respectively about 50min. and 20min. in the heavy work, and about 100min., 25min. in moderate work.View full abstractDownload PDF (1282K) -
2. The Studies of Possibility to Rise Work Efficiency at Transplanting Work of RiceKazuhiro MATSUMORI, Chiyuki TOGASHI1999 Volume 34 Issue 1 Pages 23-28
Published: March 10, 1999
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSTo study the possibility of rising work efficiency by introducing farm-road-turning form (use farm road for turning=F. R. T.), the simulation according to the working strokes of F. R. T. and standard-turning form (turning in the field=S. T.) was done at rice transplanting work.
The results are as follows;
1) When the return work turning time (t1) is shorter than 3 times of the head land work turning time (t2) at the S. T, the turning time at the F. R. T. (t1′) must be shorter than {(a-1)/(a+1)} t1+{2/(a+1)} 3t2. And t1′ must be closer to the t1 according as the short side length of the field becomes long. To make shortning the total turning time, the design of the farm land consolidation which were connected with climbing capacity of rice transplanter, the turning form and so on must be considered.
2) The transplanter which has wide operating width is useful for the F. R. T.
3) The work is started at the time when the transplanter is got in the field, and it is stopped when it is gone out the field. The transplanter can be gone out from anywhere of the short side of the field. So, moving time of the F. R. T. will be shorter than the S. T.
4) The support workers can supply the materials with little restrictions at the F. R. T. As the final return works turning involves head land works at the S. T, the required distance might be longer than the regular workable distance. And it will cause an another materials supply. So, supply time of the F. R. T. will have a possibility to be shorter than the S. T.View full abstractDownload PDF (815K) -
Hajime ARAKI, Michiaki ITO1999 Volume 34 Issue 1 Pages 29-37
Published: March 10, 1999
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSOrganic mulch was formed by mowing wheat straw and hairy vetch in a no-tillage field. Soil temperature under the organic mulch was constant, and the organic mulch decreased soil temperature in summer and early autumn and increased it in middle and late autumn compared with a bare and tilled field. The pF was maintained at 1.5-1.8 even in the dry weather of August. Though much more release of inorganic nitrogen in the soil covered with organic mulch was recognized than in the bare and tilled field, there was no definite difference in the quantity of inorganic nitrogen released between the wheat straw and the hairy vetch mulch. Nitrogen concentration in lettuce produced in the hairy vetch mulch field was a little higher than that of lettuce in the bare and tilled field in autumn, 1995. Weed growth was suppressed effectively in the field covered with hairy vetch, and weed control was 53% in the wheat straw mulch field compared with that in the bare and tilled field. The yield of leaf lettuce (butter head), tomato and pod soybean in the hairy vetch mulch field was higher than in the wheat straw mulch field or the bare and tilled field.View full abstractDownload PDF (1786K) -
Shunji ISHIKAWA, Naomi UEMURA, Tetuo SHIOYA, Eiji HONMA, Mika MASHIMO1999 Volume 34 Issue 1 Pages 39-52
Published: March 10, 1999
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSIn Japan, the harvesting time for highbush blueberry cultivars coincide with the rainy season. Fruits quality has been low due to cloudy and rainy conditions. Fruits cracking can be a problem with very wet soil following rain.
To protect fruits from the rain, we try to grow five cultivars of highbush blueberry, under artificial condition in a plastic house; included varieties were Weymouth, Earliblue, Collins, Darrow and Coville.
1) In 1994 and 1995 the plants in the plastic house were covered with vinyl sheets from March to the harvesting time. In 1996 the vinyl sheets were removed from the plastic house after flower fell.
2) The maximum daily temperature within the plastic house was 10°C-15°C higher than temperature in the open field. Due to these higher temperature, the plants sprouting date, leaf opening date, and first blooming date advanced by about 10 dats. Because of this advanced growth, harvest time in the plastic house began before the rainy season.
3) The fruit sets from trees in the plastic house yielded a higher percentage than those tested in the open field. In 1994 and 1995 fruits sets from trees in the open field yielded varying berries of weight and size than those grown in the plastic house. In 1996, fruits grown in the plastic house tended to be larger.
4) The experiment of 1996 showed that the plants protected by the plastic house resulted well with early ripning, in yield, in size and quality.View full abstractDownload PDF (1570K)
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