著者

庄司 浩一 谷森 文彦 中山 和明 川村 恒夫 小林 伸哉 堀尾 尚志

出版者

Japanese Society of Farm Work Research

雑誌

農作業研究 (ISSN:03891763)

巻号頁・発行日

vol.38, no.2, pp.73-78, 2003-06-19 (Released:2010-02-09)

参考文献数

11

被引用文献数

3 3

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The fluctuation of the surface, or relative depth of water within a paddy field, was related to yield and quality of the rice. A 0.5ha-transplanted paddy field having the fluctuation of elevation of about 100mm was used, and the level of water was monitored at several points of observation in the field. Following conclusions were obtained based upon these measurements for two years.1) There was a slight tendency of greater yields at lower elevations, although it was not statistically significant. The yield components varied among the elevations; at the lower elevations, the number of panicles per hill-plant and the number of grains per panicle were greater, and vice versa the weight of kernel and the percentage of ripened grains.2) The protein content in the kernel was significantly greater at lower elevations, which can be related to the smaller weight of the kernel and percentage of ripened grains mentioned above. The greater protein content could be also ascribed to continuous intake of nitrogen, as a result of continuous submergence of water on the soil.3) There was a case that at poorly drained intermediate elevations in the middle of the field, the protein content was as high as at lower elevations. This implied that the management of the water level or drainage was essential as well as the leveling of the paddy field, so as to produce the rice of as uniform and low protein content as possible within the field.

著者

庄司 浩一 牛尾 昭浩 松本 功 川村 恒夫 荒井 圭介 横野 喬

出版者

神戸大学

雑誌

基盤研究(C)

巻号頁・発行日

2014-04-01

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昨今のIT農業における実用的なセンサとして,穀粒の衝撃音をイヤホンで感知し,コンバイン上での収穫質量と水分,穀物乾燥機上で水分の推定を行った。コンバインの穀粒タンク内では別途用意した小型の衝突板に,乾燥機では側壁に市販のセラミックイヤホンを装着した。籾およびコムギの収穫時に出力を積算して実際の収穫質量と対応させると,単純な線形回帰でも標準誤差1 kg程度を得た。時系列の信号を周波数領域の音響スペクトルに演算しなおし,任意の2周波数バンドを選択して水分推定を行うと,標準誤差は籾で0.4%,コムギで0.8%を得た。乾燥機でも同様の手法で籾の水分推定を行ったところ,標準誤差0.1%を得た。