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Volume 51 (2020)
- Issue 4 Pages 112-
- Issue 3 Pages 77-
- Issue 2 Pages 49-
- Issue 1 Pages 1-
Volume 51, Issue 3
Vol. 51, No. 3 (Ser. No. 166)
Displaying 1-3 of 3 articles from this issue
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Hirotaka SATO, Hiroki NAKABAYASHI, Tadashi EBIHARA, Koichi MIZUTANI, N ...2020 Volume 51 Issue 3 Pages 77-88
Published: 2020
Released on J-STAGE: September 28, 2023
JOURNAL OPEN ACCESSBemisia tabaci are one of the agricultural pests causing damage to valuable crops such as tomatoes, peppers, eggplant, cucumbers, and other vegetables. Bemisia tabaci are classified based on their biotypes having different pesticide resistance. Our research group established a biotype classifier by using the acoustic method. On the other hand, it was challenging to record sounds of Bemisia tabaci quickly in a greenhouse because the sounds of Bemisia tabaci are very small and a measurement space with low noise was mainly used. In this research, we clarified the characteristics of noise in a greenhouse and constructed a prototype for recording sounds of Bemisia tabaci quickly in such environments. We also evaluated the performance of the prototype at a specific greenhouse by experiments. The obtained results suggest that the proposed system can reduce noise in the greenhouse and can record sounds of Bemisia tabaci successfully.View full abstractDownload PDF (4621K) -
Shinsuke FURUNO, Hiroyuki FUJISHIMA2020 Volume 51 Issue 3 Pages 89-96
Published: 2020
Released on J-STAGE: September 28, 2023
JOURNAL OPEN ACCESSQuestionnaire survey about shading and fruit quality for farmers growing sweet pepper in summer-fall protected cultivation were conducted. Most farmers expanded shading screen from late May to early October. After that, the rate of expanding farmer decreased gradually, and the farmer who answered that sunscald has occurred increased. The greenhouse that was expanded the shading screen until early October (Removal-greenhouse) and greenhouse that was expanded one continuous until late December (Continuous-greenhouse) were compared. Inside temperature of Removal-greenhouse was higher than Continuous -greenhouse only 0.8 °C, and there was no difference in ripening between them. The other hand, russetting fruits from Continuous -house decreased compared to Removalgreenhouse. The greenhouse that expanded shading screen which shading rate was 30 % (30 %-greenhouse) and the greenhouse that expanded one which shading rate was 50 % (50 %-greenhouse) were compared. The number of fruit setting on 30 %-greenhouse was higher than 50 %-greenhouse. The product fruit yield on 30 %-greenhouse was higher than 50 %-greenhouse too. These results reveal that the shading screen which shading rate is 30 % should be expand from after the rainy season to the end of cultivation in summer-fall protected cultivation of sweet pepper.View full abstractDownload PDF (1457K) -
Genta KANAI, Yoshimichi YAMASHITA2020 Volume 51 Issue 3 Pages 97-104
Published: 2020
Released on J-STAGE: September 28, 2023
JOURNAL OPEN ACCESSTo assess biomass solid fuel use for grain drying, we assessed wood charcoal, rapeseed oil cake, and rice husk briquette, combustion in a wood boiler used for a grain dryer. For rice husk briquettes, the heat output and conversion efficiency were found to be sufficient with additional fuel feeding and forced air supply into the kiln. Furthermore, rice drying was achieved with the rice husk briquettes. However, after combustion of 120.9 kg fuel, the kiln had too much ash to allow further feeding of fuel. Furthermore, drying stopped before the moisture content was suffi ciently low. Methods to avoid fi lling of the kiln by ash appear to be unavoidable for long-run drying: reducing ash by using not only rice husk briquettes but also wood or other low-ash fuels, removing ash from the kiln before fi lling or using a boiler having suffi cient kiln size. For wood charcoal, 30 kg of initial feeding showed the duration as greater than 7 h with suffi cient heat output (greater than 10 kW). Furthermore, grain drying the can fi nish without additional fuel feeding. Greater initial fuel feeding showed higher heat conversion effi ciency. Wood charcoal can maintain combustion without forced air supply into the kiln, as fi rewood can. Rapeseed oil cake was found to require a forced air supply into the kiln to maintain combustion. With the forced air supply, it showed suffi cient heat output for grain drying.View full abstractDownload PDF (1992K)
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