JOURNAL of the JAPANESE SOCIETY of AGRICULTURAL MACHINERY

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In this paper, the regional input-output table of Hokkaido industries announced by the Hokkaido bureau of economy, trade and industry, and the overall input-output table announced by the Ministry of economy, trade and industry were integrated together to produce two new and equally-classied input-output tables for the different sectors of industry. Using the inverse matrix obtained from the new tables as well as other documents, the embodied CO₂ emission intensity was calculated and the intensity in Hokkaido was compared with the overall intensity in Japan. The results showed that embodied CO₂ emission intensity resulting from agricultural practices in Hokkaido exceeds the intensity from the rest of Japan. Besides, the results indicated that structure of crop cultivation in Hokkaido depends a lot on importing elements produced out of the island. This means that increasing the demand of crop cultivation on favor of other industrial sectors in Hokkaido will tend to increase the emission of CO₂ in other places in Japan.

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In order to contribute in improving the efficiency of potato production, a non-destructive method which measures the growth of tuber, continuously, was examined. The measurement had two methods which were compared;the rst was to measure the diameter;while the second was to measure the circumference. Results showed the possibility to estimate the mass of tuber accurately using both methods. The requirement, therefore, is to measure the length between the two ends of the potato. However, considering the problem of irregularities caused by the stems, measuring the circumference was found more appropriate. Therefore, a device which measures the circumference was developed and tested. It was able to estimate the tuber circumference from the early stage until full the growth is completed with stability.

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In this study, we attempted to increase the high-moisture-paddy adaptability of a head-feeding combine. We describe a practical model with a baffle-plate control mechanism combined with water-repellent processing in the grain pan and cha sieves. Field tests using a practical model revealed it to be able to limit rapid increases in threshing power and threshing selection loss. The operating time of the new version can thus be lengthened by about one hour. A provisional efficiency calculation for this technology shows that the combine can be used over a greater area, plus giving an increased return on investment about 20% per unit area.

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In this study, we applied high-moisture-paddy adaptability technology that had proved useful for a head-feeding combine to a multi-crop combine. We describe the utility of its application. We developed a multi-crop combine that included water-repellent processing in the oscillating separator. Paddy eld tests revealed that the same effect as a head-feeding combine was conrmed. Soybean eld tests revealed that the generation ratio of muddy soybean and mud level of soybean when harvested under high-moisture conditions was lower than with a conventional model. Operating time of the new version was longer and contributed to production of better-quality soybean. Durability tests with the developed multi-crop combine on about 60 ha of soybean fields also revealed that only a part of the water-repellent processing in the oscillating separator wore out. High-moisture-paddy adaptability technology was thus shown to be useful for paddy harvesting work and soybean harvesting work carried out by a multi-crop combine.

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