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Volume 37 (2002)
- Issue 4 Pages 205-
- Issue 3 Pages 143-
- Issue 2 Pages 51-
- Issue 1 Pages 1-
Volume 37, Issue 2
Displaying 1-6 of 6 articles from this issue
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Katsumi TOYOKAWA2002 Volume 37 Issue 2 Pages 51-60
Published: June 14, 2002
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSA total of 414 fatal accidents in felling operations were investigated, with the following results:
1) The source of many accidents was the misdirection of falling trees causes included mistaken cutting angle (“undercutting” or “backcutting”), the lodged tree of windfall, and trees that were entangled with climbing plants. Trees falling in the wrong direction caused “flying branch” accidents by striking against standing trees, and “pulling down” accidents by lodging against a standing tree. There were also many cases of being “struck by the butt-end of a fallen tree” caused when a tree being felled suddenly broke during backcutting.
2) Safety education, KYT (a system to heighten workers' ability to determine whether or not conditions are safe) were judged to be important measures for preventing accidents from the perspective of safety management. The most common types of unsafe acts of fellers included entering danger zones, failure to confirm the safety of the work environment.
3) The accident conditions were classified into two modes, slightly reduced alertness (Phase II) and further reduced alertness (Phase I).
4) Errors in undercutting or backcutting resulted from fellers' uncertainly or presumptions without confirmation. Errors in walking resulted from fellers' uncertain operation, and in limbing or bucking, from their presumptive operation without confirmation. Errors in the handling of lodged trees resulted from fellers' improper sequence of operations. Therefore, the most effective felling accident prevention measures are considered to be a combination of safety education, KYT and having fellers point out dangerous situations with gestures and words.View full abstractDownload PDF (997K) -
Yukio IJIRO, Hisashi UENO2002 Volume 37 Issue 2 Pages 61-66
Published: June 14, 2002
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSThe utilization of the mother corm (M seed corms) as a seed corm in the taro cultivation was investigated by making comparisons with the growth and yield of standard seed corms derived from a daughter corm (D seed corm).
1) On the high morbidity of the M seed corms, there was hardly a problem by removing the contraction corms, and disinfecting the M seed corm before the laying-in of the corms.
2) The plots of both the M seed corm and the D seed corm sprouted within 10 days after planting. The growth in the early stage of the M seed corm plot was greater than in the D seed corm plot, and the leaf color was dark green. The shoot die back in the M seed corm plot was one week earlier than in the D seed corm plot.
3) Starting time in which the number of the unfolding leaves in each plot reached the maximum, new corms were formed by thickening the lower part of the main stem, and the fresh weight of the corm increased. After that, the daughter corm, the secondary corm and the 3rd corm were formed and thickened. In the M seed corm plot, many “Kogashira” daughter corms with leaves, were formed as compared with the D seed corm plot.
4) The yield of the M seed corm plot was about 3 times higher than that of the D seed corm plot, because the weight of each daughter corm and secondary corm was higher in the M seed corm plot than in the D seed corm plot.
5) From these results, we conclude that the M seed corms are useful as a seed corm source.View full abstractDownload PDF (2066K) -
Effect of Hill Distance in One Seed Sowing Method for Labor-saving and the Growth in Japanese RadishDaizou IGARASHI, Yasumasa MIURA, Hitoshi UEMATSU, Kazunori ISHIKAWA2002 Volume 37 Issue 2 Pages 67-71
Published: June 14, 2002
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESS1. Hill distances of Japanese radish in single seed sowing method were 4, 6 and 8cm for controlling vacant hill and adjusting to 24cm which is standard distance by thinning.
2. Vacant hill rate in single seed sowing method was about 5%, and was about 2% in three seed sowing (control).
3. Thinning operation time of single seed sowing method for adjusting hill distance to 24cm was about 85% of the control.
4. Growth of the radish indicated smaller depend on the decrease of hill distance, and was smallest in the control.
5. In the thinning of the radish from 8cm to 24cm distance, the distance was adjusted to 16cm at the vacant hill happened, however growth difference was not significant.
6. These results indicate that one seed sowing of 8cm distance is the most advantageous on the yield of radish and on the labor saving for the thinning.View full abstractDownload PDF (632K) -
Yuji MUKASA2002 Volume 37 Issue 2 Pages 73-79
Published: June 14, 2002
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSThe low dose system of herbicide application was examined in the zero-tilled sugar beet cultivation, for the purpose of diminishing total quantity of herbicides. The low dose system was composed on the basis of the 4-times application system for tilled fields developed in Netherlands. The main results were as follows.
1) Numerous biennial weed plants emerged from their roots in the zero-tilled field. They were not completely killed by both the low dose and the ordinary system of herbicide application. Other herbicide applications should be needed in a year before sugar beet cultivation to kill biennial weeds.
2) Annual weeds were killed almost completely by the low dose system of herbicide application in the zero-tilled field, therefore, the total application of herbicides diminished in quantity by half or less than the ordinary system. Herbicides for soil application should be used in the case of the presence of Polygonum nepalense Meisn.
3) The first herbicide was applied at distended cotyledon stage of sugar beet in the low dose system as compared with 2-leaved stage in the ordinary system. However, the depression of sugar beet growth in the low dose system was smaller than that in the ordinary application system since the dose of herbicides at a time was decreased by one-fourth or one-fifth dose of the ordinary application system.View full abstractDownload PDF (845K) -
Moriyuki SHIGYO2002 Volume 37 Issue 2 Pages 81-96
Published: June 14, 2002
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSDownload PDF (1798K) -
2002 Volume 37 Issue 2 Pages 103-121
Published: June 14, 2002
Released on J-STAGE: February 09, 2010
JOURNAL FREE ACCESSDownload PDF (3014K)
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