巻号一覧
30 巻 (1995)
- 3 号 p. 191-
- 2 号 p. 84-
- 1 号 p. 1-
30 巻, 3 号
選択された号の論文の7件中1～7を表示しています
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(第1報)覆土作用による除草効果石田 茂樹, 下名迫 寛, 宮本 啓二, 松田 清明, 山島 由光, 白旗 雅樹1995 年 30 巻 3 号 p. 191-198
発行日: 1995/11/20
公開日: 2010/02/09
ジャーナル フリーA soil covering test was conducted to investigate the killing effect of weeds. The weeds tested were chenopodium album, stellaria media, polygonum nodosum and echinochloa crus-galli. The seeds of the weeds were sown in experimental plots, and they were covered with a loose soil layer of 1.0, 1.5, 2.0 times the weeds height by hand after emergence.
Three types of intra-row weeders with different weeding mechanisms were examined to evaluate the width and the depth of soil covering and the rate of weeds exterminated by one weeding operation in an azuki-beans field in 1992.
The results obtained were as follows:
1) The killing effects were seen when the ratio of soil covering depth to the weed heights were 1.5 or more, and the rates of weed extermination were over 97% for chenopodium album, stellaria media and polygonum nodosum with the exception of 50-57% for echinochloa crus-galli.
2) When each weeder was used in the field, the range of the soil covering widths were 18-32cm, and the range of the soil covering depths were 10-25mm. Therefore, weed heights which could be exterminated by the soil covering effects were considered to be less than about 10mm for each weeder. However, weeds over 10mm were exterminated by the multiple effects of pulling, breaking and soil covering at the field tests.
3) The rate of weed extermination was over 80% immediately after one weeding operation of each weeder. But, 15-72% of the weeds regenerated and/or emerged on the thirteenth day after the weeding operation.抄録全体を表示PDF形式でダウンロード (1512K) -
(第2報)作業頻度と除草効果松田 清明, 宮本 啓二, 下名迫 寛, 石田 茂樹, 山島 由光, 白旗 雅樹1995 年 30 巻 3 号 p. 199-205
発行日: 1995/11/20
公開日: 2010/02/09
ジャーナル フリーThe field performances of 3 types of intra-row weeders were evaluated. The field tests were conducted between 1991 and 1993 in the fields of 4 crops, viz. directly sowed sugar beets, transplanted sugar beets, azuki beans, and navy beans.
1) In the case of the directly sowed sugar beets, the rates of weed extermination were between 72 and 75%. This was due to the fact that the first weeding operation before the crops emerged could not be performed, and each weeder could not give strong weeding action to the weeds, because the weeds and the crops were the same toughness in the early weeding season.
2) In the cases of the transplanted sugar beets, azuki beans, and navy beans, the rates of weed extermination were over 90% for each weeder, except for the test conducted at Kiyokawa which was hampered by rainy weather which continued in the early weeding season. Mechanical damage to crops was minimal for each weeder, and no significant difference in the yields was observed between both weeding systems of the intra-row weeder and the traditional method.
3) The number and the intervals of optimum weeding operations for each crop were considered to be more than 4 times with 7 to 9 days interval in the weeding season for each weeder.
4) The range of the estimated field capacity was approximately 0.5-1.1ha/h for each weeder.抄録全体を表示PDF形式でダウンロード (914K) -
第4報 KC1溶液を用いた調査法と耕土の反転性の検討森泉 昭治, 林 尚孝, 高橋 雅之, 池田 健一, 松井 慶一, 小島 慶太1995 年 30 巻 3 号 p. 207-213
発行日: 1995/11/20
公開日: 2010/02/09
ジャーナル フリーThe previous experiment on soil-overturning of rotary tillage was done by using soils mixed with potassium chloride (KC1). This report deals with a soil-overturning experiment which utilizes a method of spraying KC1 solution on the land surface. In this experiment, we measured the electrical conductivity (EC) for clods of each size and discussed the phenomenon of soil-overturning by rotary tillage.
The results were as follows.
(1) The EC values of surface layer, soil layer in which KC1 solution permeated, were the range of 13.7-18.0mS/cm. In the case of an experimental plot, the variation of EC values resulted with the influence of wind.
(2) The thickness of the surface layer was caluculated with EC values of natural and surface soils. It was 3.2-5.6mm thick. In the case of the P2 plot, a signicant difference of the thickness was recognized between the left and right side for spraying direction.
(3) After the investigation on soil displacement of surface layer, we obtained the result which showed deterioration of soil-overturning with the increase of tilling pitch. As this result agrees approximately with the result by a method of soil mixed KC1, the method to use KC1 solution can be also utilized to investigate soil displacement.
(4) From EC value of the clod classfied by size, it becomes clear that generation of the large clod increased around the surface layer before tillage when tilling pitch enlarged. We also confirmed that the large clod increased in upper layer after tillage, according to the increase of tilling pitch. Therefore, the cause on deterioration of soil-over-turning was clarified a little.抄録全体を表示PDF形式でダウンロード (946K) -
上下・前後方向振動軽減座席懸架装置の試作グェン リータン, 笹尾 彰, 澁澤 栄1995 年 30 巻 3 号 p. 215-221
発行日: 1995/11/20
公開日: 2010/02/09
ジャーナル フリーThis paper describes the design of a seat suspension system reducing vibrations in both vertical and horizontal directions for head-feeding type combine harvesters.
Field experiments were carried out to obtain the vibration characteristics of conventional seat suspensions. Triaxial accelerometers were placed at 2 locations (on the seat and under the seat), and the vibration signals were recorded on the data-recorder. In the experiments, engine speed was kept constant at 3000rpm which is the normal operating speed and forward speed of the combine was set at 3km/h.
From the results, we confirmed that the vibration peaked at the frequency of 6Hz produced dominantly from the reciprocating separator during threshing. We tried to design a seat suspension system using springs and dashpots in order to get the transmissibility under 50% in the range of 6Hz frequency.
The results showed that our system reduced to about 7dB (VAL) overall, especially about 12dB (VAL) around 6Hz in the vertical direction, and also about 12dB (VAL) overall, especially about 26dB (VAL) around 6Hz in the horizontal direction.
The suspension system provided the expected results in terms of vibration reduction efficiency.抄録全体を表示PDF形式でダウンロード (798K) -
第2報 農家の経営と意見古谷 正, 千葉 哲朗, 中野 丹, 市来 秀之, 宮原 佳彦1995 年 30 巻 3 号 p. 223-227
発行日: 1995/11/20
公開日: 2010/02/09
ジャーナル フリーPDF形式でダウンロード (518K) -
吉田 政雄1995 年 30 巻 3 号 p. 229-232
発行日: 1995/11/20
公開日: 2010/02/09
ジャーナル フリーPDF形式でダウンロード (451K) -
農作業日程計画への応用,ファジィ理論における可能性と確率との違い野口 良造1995 年 30 巻 3 号 p. 237-244
発行日: 1995/11/20
公開日: 2010/02/09
ジャーナル フリーPDF形式でダウンロード (848K)
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