All issues
Volume 41 (2006)
- Issue 4 Pages 153-
- Issue 3 Pages 115-
- Issue 2 Pages 59-
- Issue 1 Pages 1-
Volume 41, Issue 4
Displaying 1-6 of 6 articles from this issue
- |<
- <
- 1
- >
- >|
-
Hideki KAWAI, Sakae SHIBUSAWA2006 Volume 41 Issue 4 Pages 153-162
Published: December 15, 2006
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSIncorporation of Buffer BIN into Compost Processing for Marine Trash Collected from Water Intake of Power Plant.
We examined a system for composting marine biomass which was collected from the intake of a power plant. The amount of collected biomass, which consisted of seaweed, fish, shellfish, and so on, was sometimes inconsistent due to weather, season, state of the power plant, etc., but the composting device required a steady supply or materials. Therefore, we first determined that the scale of composting installation was 2m3 based on histogram data. Then, in order to increase the rate of operation, we set the reservoir buffer to an appropriate level. Simulation analysis showed the buffer capacity to be 5m3. We also developed a reservoir buffer for rheological materials which was fragmentation biomass before it was composted.
We discussed the buffer structure for that material. To judge that adaptation, a discharge experiment was conducted using actual materials. As a result, we determined the multi-step cylinder structure, the number of steps was 5.View full abstractDownload PDF (1695K) -
Sparse Planting for Reduction in labor of Raising of Seedling and Seedling Transportation in RiceTetsuro KAWASAKI, Youko MORISIGE, Eiji SUGIYAMA2006 Volume 41 Issue 4 Pages 163-169
Published: December 15, 2006
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSSparse planting is one of effective methods for reduction in labor of raising of seedling and seedling transportation that occupy a large part of paddy rice work.
In early season culture, we investigated the effects of enlargement hill distance on growth and yield of paddy rice culture in the case of the row distance of 30cm. The results are as follows.
1) In every transplantation time, there was a tendency that enlargement hill distance increased the number of panicles per hill and decreased the number of panicles per unit area.
2) Enlargement hill distance increased the panicle length and the number of rough rice per panicle. As a result, there was no difference in the number of rough rice per unit area and yield, although the hill distance was enlarged from 15cm to 38cm in the transplantation in the third ten days of April, and from 15cm to 30cm in the second ten days of May and the first ten days of June.
3) In order to obtain the sufficient and stable yield, it was necessary that the panicle number per square meter was over 290 and the stem number per square meter was over 310 in maximum tiller number stage.
4) These results lead to conclusion that it was able to reduce 50% or more of the amount of nursery, if the seedling transplantation was done earlier than the beginning of June. From this view point one way soy that Enlargement Hill Distance is extremely useful to reduce the raising of seedling and the seedling transportation labor.View full abstractDownload PDF (919K) -
Motomu KARAHASHI, Yoshiaki MISAO2006 Volume 41 Issue 4 Pages 170-179
Published: December 15, 2006
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSIn hilly and mountainous areas many looped-handle type weed cutters are used for clearing weeds in the levee of paddy fields. This type of weed cutter is light, cheap, and can take free working postures. For this type of weed cutter, which we call the holding type, working strain is large because the cutter is entirely supported by both hands. Therefore, we have developed the method of hanging a weed cutter by two rubber ropes from shoulder belts attached to a back-mounted board, such as has been used in the conventional shoulder type weed cutter. We call this method the “two shoulder belts” type. In this paper, we have studied how to estimate the magnitude of reduction in working strain caused by the two shoulder belts type of weed cutter.
The results are as follows;
1) It was proved that the rate of increase in heart rate was inversely proportional to the reduction in working rate (h/10a).
2) It may be possible to estimate the magnitude of the reduction in working strain by comparing the approximate curves of exponential function in the required working time of 2-5h/10a of the same worker.
3) Compared with the holding type, the two shoulder belts type decreased the working strain by about 10% of the ratio of increase in heart rate.
The two shoulder belts type weed cutter may reduce working strain to approximately that of a conventional shoulder type weed cutter with a rubber hanger-rope.
The above-mentioned results make it clear that the two shoulder belts type can decrease the working strain without spoiling the free working postures in the holding type.View full abstractDownload PDF (3459K) -
Hajime ARAKI, Mitsuaki ISHIMOTO, Yoshinobu MATSUO, Michiaki ITO2006 Volume 41 Issue 4 Pages 180-184
Published: December 15, 2006
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSSoil hardness in no-tilled field with cover crop residue mulch and early growth of machine-planted soybean
Hairy vetch and barley were cultivated for a cover crop at the University Farm of Niigata University, from October 1999. HV was killed by rotary mower (bush cutter) and roller, and barley was mowed by a reciprocal mower and flail mower on June 29, 2000. The soil hardness was reduced in the cover crop residue mulch field compared with the no-tilled field without the cover residue mulch, however, there was a difference in the amount of soil hardness reduction among cover crop residue mulches. In the field covered with rotary mower-killed HV, soil hardness was reduced most effectively. In the barley residue mulch field, some soybean seeds were not well settled in the planting furrows because the soil surface was hard. In HV residue mulch field, planting furrows were formed at the regular depth of 2-3cm, and the soybean seeds were well settled in the furrows. However, soil covering was insufficient in the HV residue mulch field. In addition, at the area with a large amount of HV residue, furrow formation was not complete. The frequency of stand establishment of soybeans in the cover crop residue mulch field was 50-60%, compared with the rotary tilled field without cover crop residue. The growth of soybeans in the field covered with rotary mower-killed HV residue was similar to that in the tilled field. It is necessary to establish the mechanical system in the soil covering after the seeds settle in the furrow when operating a sowing machine in a cover crop residue mulch field.View full abstractDownload PDF (1218K) -
A Case Study for Agricultural Mechanization in BangladeshTofael Ahamed2006 Volume 41 Issue 4 Pages 185-190
Published: December 15, 2006
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSDownload PDF (1530K) -
Tsuneo OISHI2006 Volume 41 Issue 4 Pages 191-200
Published: December 15, 2006
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSDownload PDF (5614K)
- |<
- <
- 1
- >
- >|