All issues
Volume 34 (1999)
- Issue 4 Pages 231-
- Issue 3 Pages 177-
- Issue 2 Pages 77-
- Issue 1 Pages 3-
Volume 34, Issue 4
Displaying 1-5 of 5 articles from this issue
- |<
- <
- 1
- >
- >|
-
Hidenori ARISE, Takashi MOTOBAYASHI, Kuniyuki SAITOU, Tetsuo SHIOYA1999 Volume 34 Issue 4 Pages 231-241
Published: December 20, 1999
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSEffects on the growth and yield of rice, when using no agricultural chemichals. In a 4 year period, 1991-1994, community structures of arthropods and weeds were examined in a rice paddy, producing the following results.
1. During the investigation period, rice yield in the paddy field using no agricultural chemichals produce 75% less than a field which did. Although only slightly observed, in this period, rice plant damage by insects and disease in the paddy field without chemicals was very sever, especially Monochoria vaginalis Presl. From these facts, it was considered that the disease in yield of this field was due to resultant competition with weeds.
2. Decreased number of aquatic arthropods: seedshrimps, waterfleas, mosquito larvae and Dragon-Fly Nymphs, in floods waters using pesticides application.
3. Parasitism rate of rice-planthopper insects in the paddy field with agricultural chemichals was lower than that of the paddy field without chemichals.View full abstractDownload PDF (1287K) -
Change of a heart rate and a motion of a viewpointMasaru KASHIWAZAKI, Fumitake ISHIKAWA, Yutaka KIKUCHI, Hiroshi TAKENAG ...1999 Volume 34 Issue 4 Pages 243-250
Published: December 20, 1999
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSThis research was performed to grasp a combine harvest work in which the agricultural work using an automated agricultural machine highly influences the heart rate and motion of the viewpoint of workers. We selected combine harvest work. Combine harvest work is because crop and field conditions tend to be ready and an advanced agricultural machine is used.
The results are as follows.
1. The heart rate under the harvest work varied with the individual characteristics of the people involved in the labor, as well as their skill level, and operation experience. However, this tendency was lowered and stabilized by the work becoming more skilled.
2. The workload calculated from the rising ratio of a heart rate was the same grade as a walk, and was a comparatively slight workload. However, it was found that an increase in the heart rate number appears temporarily at the time of the entrainment to a combine harvester and alighting, and momentarily a big load arises.
3. There were many repeated trials in, which motion viewpoint ahead of the combine harvester, to the right or left end divider and the front was measured using an eye mark recorder. Moreover, a relation between the grade of experience and gaze time was noted.
4. When direction control equipment is used, a worker's steering frequency decreases to 1/3, which is considered to be due to the effect of automated equipment.
5. However, when steering by direction control equipment was contrary to a worker's intention, it was found that the heart rate number goes up temporarily and momentarily a strong workload is applied, which confuses the action of the viewpoint, and consequently the steering frequency goes up.View full abstractDownload PDF (2270K) -
Separation of Trash by Water-courseYoshiteru MIYABE, Sumitaka KASHIWAGI, Hiromi TOKUNAGA1999 Volume 34 Issue 4 Pages 251-259
Published: December 20, 1999
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSAiming to develop a sugar cane detrasher by water-course, the separating performance of the trash was examined. The results obtained are as follows.
1) The sugar cane variety used in this test was NiF8 and F177. The average density of the rawmaterial cane was above 1.0.
2) The average density of the trash (top stem and vagina) was under 1.0, respectively. Comparing varieties NiF8 and F177, the average density of the latter was relatively larger than that of the former.
3) The rawmaterial (1-6 portion) could be separated from the trash (top stem 1-2 and vagina 3-5 portion) after 5 or 30 minutes in still water.
4) The separating performance of the trash by the water-course generated during the rotation of a wavyshaped impeller was superior.
5) The rawmaterial cane, the squeezed cane and the irregular cutted cane could be separated in the lower layer by the water-course. The weight percentage of the separated cane was above 99%, respectively.
6) The removing methods of the vagina separated in lower layer (6%) and the rawmaterial separated in middle layer (0.7%) must be found in the near future.View full abstractDownload PDF (2052K) -
Hajime ARAKI, Yoneji YAMASHITA, Michiaki ITO, Toshinori FUKUYAMA, Kazu ...1999 Volume 34 Issue 4 Pages 261-268
Published: December 20, 1999
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSWheat (Triticum aestivum L. cv. Mulchmugi) and barley (Hordeum vulgare L. cv. Minorimugi) were introduced in watermelon production for weed control, not seed production. To examine the weed control-effect of wheat and barley between rows of a watermelon field, they were sown in October, 1993, with the seeding rate of 4kg/10a. Elongated culms were mowed early in June, 1994, and turned into straw mulch. Light intensity (photon flux density) on the surface of the ground was suppressed by straw mulch of wheat and barley. Suppression of light intensity in wheat straw mulch 1 month after mowing was greater than that of barley because of the large biomass and its toughness. Matured seeds of the mowed culm germinated late in June, and new leaves developed above ground. Suppression of light intensity by new leaves of barley plants was more than that in wheat, and photon flux density on the surface of the ground was reduced to 30% of solar radiation. Weed quantity between rows was effectively reduced, especially by wheat straw mulch. Ground surface cover with triticale (x Triticosecale Wittmack cv. Ryeducks) was sparse because of fewer numbers of culms. Triticale was not suitable for the plant material of straw mulch in watermelon cultivation since the new shoots developed from the stubble after mowing and lifted the watermelon vines up. Intercropping system decreased the working hours for laying of straws and weedingin the field, and consequently led to labor saving.View full abstractDownload PDF (2851K) -
2. Making Whole Crop Silage of CornMasahiro MIYAZAKI, Koji INOOKU, Noriaki ISHIZUKA, Yuji NAGASAKI, Hiroa ...1999 Volume 34 Issue 4 Pages 269-276
Published: December 20, 1999
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESS1) A small-bale wrapping system for making whole crop silage of corn was developed as a suitable system for small dairy farmers to produce packed silage of high-quality.
2) The system is composed of the small round baler, the bale wrapper and the handler of bales. Corn chopped by a forage harvester is carried to the system, then compressed and packed by the small round baler. Before winding twine around a bale, some rice straws are added due to bind the chopped corn. The bale wrapped by plastic films is highly handled by using the handler.
3) The operation of the system needs three workers and the rate of work was 1.2t/h.
4) By investigation of products, it was concluded that the quality as silage was high.
5) The feeding time for 46 heads in a stanchion stall barn was only 9 minutes.View full abstractDownload PDF (2141K)
- |<
- <
- 1
- >
- >|