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Volume 35 (2000)
- Issue 4 Pages 181-
- Issue 3 Pages 125-
- Issue 2 Pages 69-
- Issue 1 Pages 1-
Volume 35, Issue 4
Displaying 1-5 of 5 articles from this issue
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Separation of Trash by AirYoshiteru MIYABE, Sumitaka KASHIWAGI, Yasuyuki KOBAYASHI2000 Volume 35 Issue 4 Pages 181-188
Published: December 20, 2000
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSIn order to develop a sugar cane detrasher by the air, the separating performance of the trash was examined. The results obtained are as follows.
1) With the increasing of the wind velocity of the blower from 9.5m/s to 12.3m/s, the trash rate of the cutting raw material cane lengths of 20cm and 30cm decreased by about 2.6-2.3%, about 3.2-2.8%, respectively (initial trash rate: 17.6%).
2) With the increasing of the wind velocity of about 1.5m/s, the extent of the cutting cane lengths of 20cm and 30cm by the winnowing became wider about 5-15cm under the X-direction and about 10cm under the Y-direction.
3) The max. extent of the trash by the winnowing showed the width of about 300-400cm from the outlet of the blower and the max. dispersing distance of the trash was 500cm, at the wind velocity of 10.8m/s and the cutting cane length of 20cm. With the increasing of the wind velocity of about 1.5m/s, the max. extent and the max. dispersing distance showed the increase of the width of about 50cm and of the length of about 100cm.
4) The proper wind velocity of the blower and the cutting length of the cane were 10.8m/s, 20cm, respectively, when the trash rate was about 2.4% and the working efficiency was about 4.2ton/h.
5) With the increasing of the air pressure of the outlet of the compressor from about 10×105Pa to 59×105Pa, the percentage of the weight of the separated trash and of the piece of the detrashed cane increased, respectively.
6) The percentage of the weight of the separated trash and of the piece of the detrashed cane were about 90% and about 77%, respectively, at the air pressure of about 59×105Pa.View full abstractDownload PDF (872K) -
Hiroshi YOSHIOKA, Fumio SATO, Takahiro FUJIWARA2000 Volume 35 Issue 4 Pages 189-197
Published: December 20, 2000
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSFor the purpose of developing labor saving cultivation system of the fresh market tomato, the following were examined: multi-shoots training and whole truss-harvesting in single-truss tomato plants.
1. To keep the high uniformity of shoot growth and flowering between lateral shoots regardless of the cultivation time, the double shoot-training method which used two lateral shoots developed from first and second node of primary shoot of seedlings was suitable.
2. The occurrence of malformed fruit increased, when number of trained lateral shoots were increased.
3. By topping and transplanting of seedlings at the same time, it was possible to raise uniformity of the flowering on suppressing the generation of the malformed fruit.
4. By utilization of cultivar which did not became soft easily even if ripening and ethephon spraying of 400ppm for the truss before the harvesting, simultaneity harvesting by the bunch take was possible.
5. We proposed the laber saving cutivation system of fresh market tomatoes which consisted of main element techniques such as mechanical transplanting of plug seedlings, double-shoots training of single-truss plants, whole-truss harvesting and fruit selection with color sencer.View full abstractDownload PDF (1162K) -
Tomohiro TAKIGAWA, Tsuyosi HONMA, Tetsuo SHIOYA, Shunji ISHIKAWA2000 Volume 35 Issue 4 Pages 199-209
Published: December 20, 2000
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSEmerged weed species and seasonal variations in emergences of selected 22 weeds were examined at 366 fields of 27 University's attached farms, which were upland crop fields, orchards and grasslands under ordinary crop management practices. As a result 4153 weed emergence data were recorded and emergences of 274 weed species were observed. And 1458 data were obtained in the examination of seasonal variations of weeds emergences. A relational database was made based on the store of the data. Finally the query program for users unfamiliar with usage of database was developed and installed on the database. This function enables the users to set a complicated query condition with easy operations. It is also possible to narrow down a data after an application of the query by a filtering function provided by the developed program In addition printing and data transfer functions are installed in the program for further data analysis.View full abstractDownload PDF (3548K) -
In Busy SeasonSumio TACHI, Yasutaka NIISATO2000 Volume 35 Issue 4 Pages 211-221
Published: December 20, 2000
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSWe compared time budget structures of tulip bulb farmers in the harvest and post-harvest seasons in Japan and the Netherlands, by interview and questionnaire survey.
Our results are as follows:
1) According to our interviews, in Japan there are two peaks in monthly allocation of yearly labour input, June-July (harvest and post harvest) and October (planting). In contrast, there is one peak in the Netherlands, June-July (harvest and post harvest). In Japan labour time fluctuates in month and month, while in the Netherlands it does not.
2) During the harvest and post harvest season (9 days), Japanese farmers work for twelve to thirteen hours in average and sleep for less seven hours, while Dutch farmers work at most for ten and half hours and sleep for eight hours in average.
3) One of the reasons for the above fact is that Japanese farmers work even on Saturday and Sunday but Dutch ones do not so.View full abstractDownload PDF (2031K) -
Kiyoshi TAJIMA, Masayoshi KATO, Junya TATSUNO2000 Volume 35 Issue 4 Pages 223-228
Published: December 20, 2000
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSCultivation with cover crop or organic mulch is recognized as one of the effective conservation agricultural methods. A tillage tool called “shaft tillage tool” was designed for planting vegetables onto the bed covered with organic mulch. In this study rooting of the Chinese cabbage seedlings and energy efficiency of the two types of the tool, one is for a paper pot seedling and another is for a plug seedling, were examined. These tools were driven by a hand drill driver, and bored vertical short-cylinder shaped to place seedlings and a deep narrow shaft shaped hole for rooting. The Chinese cabbage seedlings were grown in a paper pot and as plug seedlings before the transplant and were placed without covered with soil or tramped. Chemical fertilizer was broadcasted on the surface (solid fertilizer) and placed on a tip of the shaft (solid and paste). Non-fertilized seedlings were also examined as acomparison. Rooting of the Chinese cabbage were successfully confirmed without any damaging by fertilizer. On the comparison with application methods of the fertilizer, the effect was appeared rapidly under the broadcasted and paste fertilizer.
The power requirements of tillage were 230-300J/seedling at paper pot and 300 tillage operations were done in one charge of a 2Ah-capacity battery.View full abstractDownload PDF (724K)
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