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RISS 인기검색어
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- 저자 : ( Ryuichi Yoshizaki ) (검색결과 1 건)
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Relationships between Mass and Porosity of Rough Rice Piled in a Combine Grain Tank
( Ryuichi Yoshizaki ),( Yasumaru Hirai ),( Muneshi Mitsuoka ),( Shio Inagaki ),( Eiji Inoue ),( Takashi Okayasu ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Percentage of ripened grains (PRG) is an important indicator to evaluate soil and crop management in rice production and is used to estimate weight of ripened brown rice by which economic returns are determined in Japan. This study focused on estimating PRG using bulk density of rough rice piled in the grain tank of a combine harvester. Our former study has showed that linear relationships between bulk density and particle density (an indicator of PRG) of rough rice piled in a vertical cylinder were dependent on the filling conditions of the rough rice. This finding required to clarify the filling conditions of the rough rice piled in a grain tank to estimate PRG using bulk density. Porosity is an indicator to evaluate the filling conditions. Thus, the objective of this study was to clarify factors affecting the porosity of rough rice piled in a grain tank. Relationships between mass and porosity of rough rice piled in a grain tank was measured through the field tests and the indoor experiments using a 6-row and a 4-row head feeding combine harvester, respectively. In addition, relationships between pressure at the bottom part in the grain tanks and porosity were compared between the field tests and the indoor experiments. The determination coefficients (R<sup>2</sup>) of regression lines between mass and porosity were high: 0.96 in the field tests and 0.88 in the indoor experiments. These relationships showed that mass is a major factor affecting porosity of rough rice piled in a grain tank. For the relationships between pressure at the bottom part of a grain tank and porosity, the field tests (moisture content: 23-29 %) showed 6 % larger porosity at around 2.5 kPa of pressure than the indoor experiments (moisture content: 15 %). Lowered fluidity of rough rice at higher moisture content is a possible cause of this larger porosity in the field tests. In addition, the magnitude of the slope of the regression line for relationships between the pressure and porosity was higher in the field tests (2.74) than in the indoor experiments (0.83). This result suggested that shaking of the combine during harvest, which involved only in the field tests, affected the porosity.
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