著者

下嶋 浩平 小川 諭志 内藤 裕貴 Milton Orlando Valencia 清水 庸 細井、 文樹 宇賀 優作 石谷 学 Michael Gomez Selvaraj 大政 謙次

出版者

生態工学会

雑誌

Eco-Engineering (ISSN:13470485)

巻号頁・発行日

vol.29, no.1, pp.11-16, 2017-01-31 (Released:2017-02-01)

参考文献数

15

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Remote sensing technology for monitoring plant trains has a huge potential to accelerate breeding process. In this paper, we have studied on remote sensing of using an unmanned aerial vehicle (UAV) system for plant traits phenotyping in rice. The images of rice canopy were taken by a RGB camera from the UAV at three growing stages; Vegetative (VG), Flowering (FW) and Grain filling (GF). Typical color indices (r, g, b, INT, VIG, L*, a*, b*, H) were calculated by image processing. Single regression analysis was conducted between rice plant traits (leaf area index (LAI), grain yield, above ground biomass, plant height, panicle length, grain filling rate, tiller number) and color indices. The index a* at FW and GF had close liner relationships with LAI (the coefficient of determination R2 > 0.70) and grain yield (R2 > 0.50). Moreover, a* and g at FW and GF showed high R2 with plant height and grain filling rate (R2 > 0.50). The R2 between grain yield and color indices increased above 0.5 for about 40% of models at three growing stages by multiple regression analysis. In particular, the models of H and INT and of H and L* at VG were closely related (R2 > 0.70). Our findings show the analysis of color images taken by UAV remote sensing is useful to assessing four rice traits; LAI, grain yield, plant height and grain filling rate at early stage, and especially more available for grain yield estimation.

著者

松本 隆仁 乾 博 宮武 和孝 中野 長久 村上 克介

出版者

生態工学会

雑誌

Eco-Engineering (ISSN:13470485)

巻号頁・発行日

vol.19, no.4, pp.223-227, 2007-10-31 (Released:2008-03-29)

参考文献数

29

被引用文献数

1

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We have investigated the effects of light quality and CO2 concentration (0.04% and 10%) on growth of Euglena as a fundamental study. Useful nutrients such as high quality protein and fatty acid, as well as specific saccharide (β-1,3 glucan), contained in Euglena are now being highlighted. In the present study, we investigated the effects of light quality and CO2 concentration on the production of protein, paramylon and fatty acid. Under the CO2 concentration of 0.04%, protein contents in Euglena cultured in red and blue light were 105.0 μg 106 cells-1, paramylon 48.2 μg 106 cells-1, and in blue light fatty acid was 20.3 μg 106 cells-1, higher than those in other light conditions. Whereas under the CO2 concentration of 10%, protein contents in Euglena cultured in red and blue light were 125.6 μg 106 cells-1, paramylon 57.6 μg 106 cells-1, and in blue light fatty acid 29.7 μg 106 cells-1, higher than those in ordinary air conditions (with 0.04% CO2). No significant differences in these nutrient contents were found between the four light quality treatments under the CO2 concentration of 10%. As previous data we showed growth of Euglena depended on chlorophyll contents, protein and paramylon contents depended on chlorophyll contents, too. It was concluded that Euglena would be good nutrition source when they are cultured in each light conditions under CO2 concentration of 10%, so CO2 discharged from industrials, power stations and so on, will be utilized to this new food production system, effectively.

著者

Haruki Takayanagi Takayoshi Nishida

出版者

生態工学会

雑誌

Eco-Engineering (ISSN:13470485)

巻号頁・発行日

vol.29, no.2, pp.53-56, 2017-04-30 (Released:2017-04-30)

参考文献数

9

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In recent years, an increasing emphasis on conserving biodiversity in cultivated land has led to a need for environmentally friendly and sustainable agriculture that does not depend on the excessive use of agrochemicals. However, it can be difficult to generate high crop yields without using herbicides because alternative methods of restricting weed growth are often costly and labor-intensive. Here, we designed a mesocosm to examine the weeding efficacy of a cheap, commercially available, automatic robot ball, which was originally designed for house cleaning. The weeding robot performed very well, particularly for sprouts of Monochoria vaginalis var. plantaginea, a major paddy weed found in central Japan.

著者

増田 篤稔 隠地 武彦 村上 克介

出版者

生態工学会

雑誌

Eco-Engineering (ISSN:13470485)

巻号頁・発行日

vol.27, no.3, pp.67-72, 2015-07-01 (Released:2015-08-26)

参考文献数

7

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Controlling dissolved oxygen (DO) level in rearing tank is one of the most important for intermediate breeding of abalones with land based production facilities. Continuous DO measurement was conducted for two rearing tanks of 15.5 m3 seawater each and containing 19,000 abalone of 50 mm length and 60,000 abalone of 23 mm length in running seawater condition of 17.6 m3 per hour. Oxygen consumption of abalone was also examined. A model formula expressing oxygen distribution in rearing tank was made based on these data. There are diurnal changes in DO concentration in rearing tank, higher in afternoon and lower in midnight, and DO decreased to less than 80% of saturation couple of times, harmful level for good growth.