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Volume 48 (2017)
- Issue 4 Pages 197-
- Issue 3 Pages 123-
- Issue 2 Pages 67-
- Issue 1 Pages 2-
Volume 48, Issue 3
Vol. 48, No. 3 (Ser. No. 154)
Displaying 1-6 of 6 articles from this issue
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-Livestock Manure-based Methane Fermentation Systems-Masahiro IWASAKI, Yoshiteru TAKEUCHI, Kazutaka UMETSU2017 Volume 48 Issue 3 Pages 123-130
Published: 2017
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSDownload PDF (1083K) -
-Quality and Properties of Grain and Beans-Yukiharu OGAWA2017 Volume 48 Issue 3 Pages 131-137
Published: 2017
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSDownload PDF (1029K) -
Hayato UDO, Hiroki NAKABAYASHI, Koichi MIZUTANI, Tadashi EBIHARA, Naot ...2017 Volume 48 Issue 3 Pages 138-145
Published: 2017
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSThe purpose of this study is to investigate possibility of early detection of whitefl y presence in greenhouse environment using image processing. Whitefl ies are very small agricultural pests that carry serious viral plant diseases such as Tomato yellow leaf curl virus. One of the problems in whitefl y control is that farmers cannot notice the presence of whitefl ies in greenhouses until they increase their population. However, if it is possible to develop a system that monitors presence of whitefl ies in greenhouse for long period of time, farmers can react and take measures much quickly. To achieve this, a system that monitors presence of whitefl y in the greenhouse is necessary. In this paper, whitefl y monitoring system composed of camera and image processor is proposed. Image processing techniques such as fi ltering, thresholding, and template matching were used to construct whitefl y detection algorithm. Accuracy of the image processing method was examined. The detection system correctly detected 132 whitefl y bodies out of 148 actual whitefl ies in images, and rate of correct detection was 89.19 %. Also, out of 100 total sample frames, only two of them was incorrect detection and rate of incorrect detection was 2 %. The result clearly showed that detection of whitefl ies was feasible with the proposed image processing method.View full abstractDownload PDF (1428K) -
Yu KOBAYASHI, Erika TAGUCHI, Michinori KARIKOMI, Takao KIMURA2017 Volume 48 Issue 3 Pages 146-153
Published: 2017
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSFor use as a water reserving material or a plant culture medium, interpenetrating polymer network (IPN) hydrogel was prepared by combination of chemical crosslinking of polyitaconic acid with amidic type crosslinker and physical crosslinking of polyvinyl alcohol (PVA) based on hydrogen bonding. The effect of IPN hydrogel on the culture of a plant such as white radish sprouts or western turf was investigated by two direct seeding methods. Under the mixture of a soil (black soil or IWASE sand) and IPN hydrogel, the water retentivity of soils increased with the addition of more IPN hydrogel, and it was possible to culture plants over a longer time period. Under only IPN hydrogel as a culture medium, cation species included into IPN hydrogel affected plants growth and preferable growth of plants was observed in cultivation on the IPN hydrogel containing calcium ions as counter cation of the carboxylate anion.View full abstractDownload PDF (2073K) -
Haiyan HE, Rika SUZUKI, Michinori KARIKOMI, Takao KIMURA, Shigeaki MAR ...2017 Volume 48 Issue 3 Pages 154-164
Published: 2017
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSFilms were prepared by thermal kneading of a plastic matrix with a calcium compound fi ne powder derived from scallop shells or dolomite, followed by hot-press molding. The commercial biodegradable aliphatic polyester “Terramac TP-4071” that the main component is the blend of poly(L-lactic acid) and polybutylene succinate adipate was selected as a plastic matrix. The resulting fi lms were investigated by a hydrolysis test and soil burial test for 90 d. The biodegradability of these fi lms was examined by the time-course of weight loss, total organic carbon content, and the surface morphology, observed by SEM. In addition, it revealed a difference of the addition effect of the different modifi ers. As a result, no matter which kind of the modifi ers was added, it contributed to accelerate the speed of degradation of commercial biodegradable aliphatic polyesters and to suppress the acidifi cation of soil used as the medium. However, due to the difference of the main component and the particle size of the modifi ers, the degradation rate of the composite fi lm was also found slightly difference.View full abstractDownload PDF (3883K) -
-Case study on “Kumano Bamboo Greenhouses” in Kumano city, Mie Prefecture-Shingo NAGANO, Hirohide KOBAYASHI, Kouji TANI2017 Volume 48 Issue 3 Pages 165-176
Published: 2017
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSThe objective of this study was to develop a self-bulidable greenhouse using bamboo to decrease cost for material and building work. Small-scale experimental Bamboo Greenhouses (BGHs) were built in Ikusei-cho, Kumano city, Mie prefecture. Materials costs for both BGH No. 1, resembling an even-span greenhouse, and BGH No. 2, resembling an Quonset style greenhouse, were approximately 160 000 yen/a. This is approximately half that of a steel-pipe house. BGH No. 1 and BGH No. 2 could be built in 364 and 267 hours, respectively. The calculation of structural strength is diffi cult because of the variability of dryness and degradation of bamboo materials. However, critical damages have not been observed in either BGHs during the 47 months post-construction. As for the ability for heat retention, the average daily temperature inside of the BGH was 2.5 °C higher than the ambient temperature in winter. From these results, it is found that the costs of materials in BGHs were lower than that of steel-pipe house, and that BGHs can be self-built at a small-scale, irregular-shaped farmland. Continuous observations of bamboo strength will be conducted to determine the number of durable years, and a simpler method for assembly of the bamboo structure may be developed. Moreover, cutting bamboo for the maintenance of abandoned bamboo groves will help to prevent animal damage and to conserve the traditional landscape of farming and mountain villages.View full abstractDownload PDF (2171K)
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