論文 - 霧村 雅昭
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Zushi K., Yamamoto M., Matsuura M., Tsutsuki K., Yonehana A., Imamura R., Takahashi H., Kirimura M.
Journal of the Science of Food and Agriculture 105 ( 2 ) 1159 - 1169 2024年9月
担当区分：最終著者 掲載種別：研究論文（学術雑誌） 出版者・発行元：Journal of the Science of Food and Agriculture
BACKGROUND: Strawberry is a rich source of antioxidants, including ascorbic acid (ASA) and polyphenols, which have numerous health benefits. Antioxidant content and activity are often determined manually using laboratory equipment, which is destructive and time-consuming. This study constructs a prediction model for antioxidant compounds utilizing machine learning (ML) and multiple linear regression based on environmental, plant growth and agronomic fruit quality-related parameters as well as antioxidant levels. These were studied in three farms at two-week intervals during two years of cultivation. RESULTS: During the ML model screening, artificial neural network (ANN)-boosted models displayed a moderate coefficient of determination (R2) at 0.68–0.78 and relative root mean square error (RRMSE) at 3.8–4.8% in polyphenols and total ASA levels, as well as a high R2 of 0.96 and low RRMSE at <3.0% in antioxidant activity. Additionally, we developed variable selection models regarding the antioxidant activity, and variables two and five (environmental parameters and leaf length, respectively) with high accuracy were selected. The linear regression analysis between the actual and predicted data of antioxidants in the ANN-boosted models revealed high fitness with all parameters in almost all training, validation and test sets. Furthermore, environmental parameters are essential in developing such reliable models. CONCLUSION: We conclude that ANN-boosted, stepwise and double-Lasso regression models can predict antioxidant compounds with enhanced accuracy, and the relevant parameters can be easily acquired on-site without the need for any specific equipment. © 2024 Society of Chemical Industry.
DOI： 10.1002/jsfa.13906
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Prediction of PPFD (photosynthetic photon flux density) under transparent CPV modules 査読あり
Toyoda T., Yajima D., Kirimura M., Araki K., Ota Y., Nagaoka A., Nishioka K.
AIP Conference Proceedings 2841 ( 1 ) 2023年9月
掲載種別：研究論文（学術雑誌） 出版者・発行元：AIP Conference Proceedings
Recently, the agro-photovoltaic (agri-photovoltaic) system is expected to penetrate the market due to its advantages in some crops and significant potential installation areas. In principle, the agro-photovoltaic system shares solar energy with PV and agriculture, and its appropriate and controlled distribution is the key for the economy. Accurate and reproducible optimization design is essential. Any PV modules can be used for the agro-photovoltaic system. The best may be the transparent CPV that uses direct sunlight to concentrate onto solar cells and diffused sunlight to illuminate the farming light through a transparent backplane. The diffused sunlight for typical CPV modules is not used for electricity generation, and the transparent CPV is utilized as the secondary light source to crops. The diffused sunlight does not create shadow and improves the inhomogeneity of PPFD (Photosynthetic Photon Flux Density) from the stripe of shadows by PV modules, thus improving the yield. This paper predicts PPFD by the transparent CPV modules and the effectiveness of its use for the agro-photovoltaic system.
DOI： 10.1063/5.0146145
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Yajima, Daisuke Toyoda, Teruya Kirimura, Masaaki Araki, Kenji Ota, Yasuyuki Nishioka, Kensuke
Energies 16 ( 7 ) 3261 - 3261 2023年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Energies
Climate change and increasing food demand are global issues that require immediate attention. The agrivoltaic system, which involves installing solar panels above farmland, can simultaneously solve climate and food issues. However, current systems tend to reduce agricultural production and delay the harvest period due to shading by the solar panels. A delayed harvest period impacts the income of farmers who wish to sell produce at specific times. Incorporating a model that calculates the amount of electricity generated by solar irradiation, this study establishes a model to estimate the correct start date of cultivation for solar panel covered crops to ensure the correct harvest date and determines the expected income of farmers by calculating agricultural production and power generation. Using taro cultivation in Miyazaki Prefecture as a case study, the model estimated that the start date of cultivation should be brought forward by 23 days to ensure the ideal harvest period and agricultural production. This would prevent an opportunity loss of USD 16,000 per year for a farm area of 10,000 m2. Furthermore, an additional income of USD 142,000 per year can be expected by adjusting shading rates for the cultivation and non-cultivation periods.
DOI： 10.3390/en16073261
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Yajima D., Toyoda T., Kirimura M., Araki K., Ota Y., Nishioka K.
Cleaner Engineering and Technology 12 100594 - 100594 2023年2月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Cleaner Engineering and Technology
Climate change and increasing food production due to population growth are global challenges that need immediate attention. The introduction of renewable energy to mitigate climate change and the requirement of adequate land to increase food production are generally mutually exclusive. However, an agrivoltaic system generates renewable electricity and produces agricultural products from a common piece of land, thus increasing the land productivity. In addition, this system contributes to local production, thus reducing the CO2 emissions from logistics. Photovoltaic arrays in previous studies were designed by calculating the irradiance in W/m2, even in recent studies. A careful design of the farmland's illumination must be developed for effective agriculture. The simulations must be scaled based on photosynthetic photon flux density rather than irradiance commonly applied in photovoltaic technology simulations. This study focused on the photosynthetic photon flux density and employed an all-climate solar spectrum model to calculate the photosynthetic photon flux density accurately on farmland partially shaded by solar panels and supporting tubes. This study described an algorithm for estimating the photosynthetic photon flux density values under solar panels. The calculated data were validated using the photosynthetic photon flux density sensors. To calculate the photosynthetic photon flux density under the solar panels, it is essential to weigh the direct and diffused components shaded by the solar panels separately because they have different spectrums. A method to quantify the shading was explored here by solar panels and their supporting tubes for the direct and diffused component as the sun moves. The calculation formula was established by defining the sun's moves and the positions of solar panels and their supporting tubes in terms of elevation and azimuth angles from the observation point. It was found that the waveform based on the calculation formula for the photosynthetic photon flux density under the solar panels reproduced the same tendency as the measured photosynthetic photon flux density. To evaluate this trend numerically, the measured and calculated photosynthetic photon flux densities were compared using the standard residuals. Generally, the similarity of the two values is confirmed by a standard residual value between −3 and 3. The result of this study showed that the standard residual values were negative in more frequencies except for the zero photosynthetic photon flux density at night. This indicates that the calculated photosynthetic photon flux density tends to be higher than the measured photosynthetic photon flux density. The peak frequency of the standard residuals was between −6 and −3. This difference probably occurred because the established calculation formula targets the shading provided by the solar panels and supporting tubes but does not cover the shading provided by the other system structures. The calculation formula enables farmers to evaluate the economic efficiency of the system before introducing it using measured solar irradiation data at the target farmlands by introducing published neighborhood solar irradiation data and considering, in advance, measures to avoid the effects of shading on agricultural production. The next study will be to improve the accuracy of the calculation formula by increasing the number of days and develop a method that leads to the best practices of agricultural production and solar power generation by introducing the system.
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Tissue-dependent seasonal variation and predictive models of strawberry firmness 査読あり
Zushi, K., Yamamoto, M., Matsuura, M., Tsutsuki, K., Yonehana, A., Imamura, R., Takahashi, H., Kirimura, M.
Scientia Horticulturae 307 111535 - 111535 2023年1月
担当区分：最終著者 記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Scientia Horticulturae
Firmness is an important quality factor in strawberries. We investigated the tissue-dependent seasonal variation in strawberry firmness in epidermis, cortex, and pith tissues, and also developed statistical predictive models for the seasonal changes in firmness using environmental conditions and fruit properties. The experiment was conducted at three locations (sites A, B, and C) and in different harvesting seasons from winter (December) to spring (May) during 2 years. The fruit properties, including the total soluble solids (TSS), acidity, and fruit surface color decreased toward the end of the season (from winter to spring), with fruit harvested in April and May having the lowest values at all research sites. Similarly, the epidermis firmness decreased 0.73-fold toward the end of the season at all the research sites. The cortex firmness of site A showed a marked decrease of 0.64-fold toward the end of the season, but that of sites B and C remained at constant levels. The pith firmness tended to be higher for fruit harvested in December than in other months. We tested the training dataset using the stepwise multiple linear regression analysis to construct the statistical predictive models of firmness. The goodness-of-fit of the firmness predictive models, shown by the adjusted square correlation coefficient, was 0.47–0.54 in the model using the input data for daily mean environmental conditions several days before harvest as well as fruit properties, including fruit weight, color, and TSS. Additionally, in the regression analysis between predicted and actual values, the predictive models demonstrated accurate high performance with a low predictive error (0.06 as relative root mean square error). Thus, we concluded that strawberry firmness shows seasonal variation within the epidermis and pith tissues, and that their predictive models were of adequate accuracy and usefulness without the need for time-consuming, costly measurement equipment.
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Masaaki Kirimura, Shinichi Takeshita, Mitsuhiro Matsuo, Kazufumi Zushi, Yoshinori Gejima, Chitose Honsho, Akira Nagaoka, Kensuke Nishioka
Environmental Control in Biology 60 ( 2 ) 117 - 127 2022年4月
担当区分：筆頭著者, 責任著者 記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Environmental Control in Biology
In a sustainable society, it is necessary to develop systems that produce enough food and energy while also preserving the environment. Both agricultural production for food generation and photovoltaics for renewable energy production require large, open fields. In this research study, we investigate the feasibility of combining food and energy production into a single field by examining the effects of installing photovoltaic equipment above land used for farming. We grew komatsuna, kabu, mizuna, and spinach underneath photovoltaic equipment, and investigated the influence of shading from the photovoltaic equipment on plant growth and yields during winter cultivation. As expected, both the amount of solar radiation and the air and soil temperature were lower under the photovoltaics than those under the open field. The growth rate of komatsuna, kabu, and mizuna were slower. However, yields and qualities sufficient to meet market demands remained possible with extension of the cultivation periods. Therefore, although temperature and solar radiation are reduced under the photovoltaic equipment in winter, it is nevertheless possible to produce vegetables in the farmland, providing a novel opportunity to realize an integrated agricultural system with parallel production of food and energy.
DOI： 10.2525/ecb.60.117
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Kazufumi ZUSHI, Taiki FUKUDA, Yudai MORI, Hiromi TAKAHASHI, Masaaki KIRIMURA
Environmental Control in Biology 60 ( 1 ) 91 - 101 2022年1月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Environmental Control in Biology
Seasonal variations of health-promoting properties of fruits have been known to depend upon environmental conditions and plant growth parameters; therefore, their trend lines need to be predicted. This study was aimed at finding out the impact of seasonal variations, induced by changes in the environmental conditions, to health-promoting properties of cherry tomato in long-term cultivation and at developing their statistical predictive models. Both total ascorbic acid content and antioxidant activity increased gradually during research period regardless the experimental site or year. Polyphenol content was the lowest at the initial date of study but it depended on experimental years. In addition, by the stepwise multiple linear regression analysis, we were able to develop a predictive model for health-promoting properties by using environmental data and plant growth/agronomic quality traits. In the best-fitted model, the combinations of data set and the data period were different for each compound. Furthermore, health-promoting properties can be predicted with high accuracy by using several environmental data 2 or 3 weeks before the harvest time and the growth/agronomic quality data at the harvest day. Thus, we conclude that constructed models may contribute to a good practice for the prediction of health-promoting properties of tomato.
DOI： 10.2525/ecb.60.91
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Kazufumi ZUSHI, Kan TSUTSUKI, Hiromi TAKAHASHI, Masaaki KIRIMURA
Environmental Control in Biology 59 ( 3 ) 147 - 155 2021年7月
担当区分：最終著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Environmental Control in Biology
Strawberry (Fragaria×ananassa Duch.) is a rich source of diverse antioxidants associated with health benefits. However, the interactions of antioxidants with plant growth and photosynthetic performance have not been investigated in the strawberry fruit. This study aimed to visually identify the interactions of antioxidant compounds with plant growth, photosynthetic performance, and agronomic quality in commercially grown strawberry on three farms during a 2-month period using correlation network analysis. Growth and photosynthetic performance-related parameters showed variations between seasons and among farms, whereas antioxidant compounds showed only seasonal variations. Additionally, the total polyphenol content and antioxidant activity showed a negative correlation with ten and seven leaf photosynthetic performance parameters, respectively, but no correlation with any of the growth parameters. By contrast, ascorbic acid (ASA) and total ASA were correlated with two photosynthetic performance parameters and three plant growth parameters. These results suggest that ASA exhibits different interactions with the total polyphenol content and antioxidant activity. In addition, leaf thickness and several photosynthetic performance parameters were key factors of the interaction of antioxidant compounds. Overall, our results indicate that correlation network analysis provides useful information to enhance the level of antioxidant compounds in strawberry.
DOI： 10.2525/ecb.59.147
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栽培と太陽光発電を組み合わせたソーラーシェアリング 招待あり
霧村 雅昭
農業および園芸 96 ( 2 ) 129 - 143 2021年2月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Tobisa M., Uchida Y., Iwasa S., Tsukiyama T., Asano Y., Kirimura M., Sugimoto Y.
Journal of Agricultural Science 155 ( 10 ) 1565 - 1576 2017年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Journal of Agricultural Science
Copyright © Cambridge University Press 2017. The present study investigated the dry matter yield (DMY) and arbuscular mycorrhizal (AM) colonization (internal hyphae, arbuscules, and vesicles) of two genotypes of zoysia grass (Zoysia japonica strain Aso and cv. Asagake) at three rates (10, 20 and 40 g N/m 2 /year) of application of digested slurry (DS) or mineral fertilizer. Soil chemical properties (available phosphorus concentration, pH and electrical conductivity (EC)) were also measured as factors associated with AM colonization. The fertilizer type (DS v. mineral fertilizer) had an effect on DMY depending on the plant genotypes but had little or no effect on AM colonization, and soil chemical properties, indicating that DS can be used as a substitute for mineral fertilizer; however, it is necessary to apply it taking into account the ratio of inorganic nitrogen (N). However, heavy DS application decreased colonization by internal hyphae. Furthermore, even at the lowest rate, the continuous application of DS decreased colonization by arbuscules and vesicles in both genotypes, which were associated with decreasing soil pH and increasing EC. The results suggest that zoysia grass should be fertilized with DS at a rate of < 10 g N/m 2 /year in order to achieve a continuous association with AM fungi, although this range of N application is sub-optimal for zoysia grass production.
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霧村 雅昭
地域生活学研究 7 ( 0 ) 127 - 138 2016年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：富山大学地域生活学研究会
営農型発電システムは、農地の上空に設置した太陽光発電設備で発電し、地上では農作物を生産するハイブリッドな農業システムである。発電した電気を売ることで売電収入が得られ、農家所得の向上が期待できる。また、このシステムを利用することで夏季の過剰な日射を遮ることにより栽培環境の改善が期待できる。一方で、農地保全のためには適正な営農の継続が必要であり、食料生産とエネルギー生産を両立する栽培管理技術が必要となる。本報では、営農型発電設備の設置が設備下で栽培した作物の収量と栽培環境へ及ぼす影響を調査した結果と営農型発電の可能性について論じる。
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メタン発酵消化液の施用が南九州におけるトウモロコシ-イタリアンライグラス体系の収量性と飼料品質に及ぼす影響 査読あり
井戸田 幸子, 浅野 陽樹, 霧村 雅昭, 杉本 安寛, 石井 康之
日本草地学会誌 58 ( 4 ) 230 - 240 2013年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：日本草地学会
トウモロコシ―イタリアンライグラス体系におけるメタン発酵消化液(消化液)の2年間の連用施肥効果を，化成肥料単独施用(化成区)および慣行施肥(牛糞堆肥と化成肥料の併用，慣行区)と比較した。消化液の施用量は，標準，多および極多区(それぞれ40，70および100gN/m2/年)の3水準とした。化成区では標準区と同量(40gN/m2/年)のN施用量とし，慣行区では69.2gN/m2/年で，多区とほぼ同量のN施用量であった。その結果，消化液は短期的には同量の無機養分を含有する化成肥料と同等の肥効を有し，南九州のトウモロコシ―イタリアンライグラス体系での適正な消化液の施用量は，収量，発酵品質，安定性，見かけのN回収率および環境への影響などを総合的に判断すると年間40gN/m2以下が望ましいと推察された。
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Rahman, M.J., Inden, H., Kirimura, M.
HortScience 47 ( 11 ) 1574 - 1579 2012年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：HortScience
There is increasing interest in reducing fertilizer cost and establishing proper irrigation management for sustainable vegetable production. Nigari, an effluent of salt industries, is cheaper than commercial fertilizers. Another important vegetable production factor is nutrient application timing to improve soilless cultivation in crops like sweet pepper. Therefore, this study evaluated the effects of nigari and nutrient solution application timing on leaf gas exchanges of sweet pepper cultivated under a soilless system. Treatments included three nigari rates [no nigari plus a standard nutrient solution as control, 2 mL·L -1 nigari + additional nitrogen-phosphorus-potassium (N-P-K) to equal the standard, and 4 mL·L -1 nigari + additional N-P-K to equal the standard]. Three daily application timings (T 1 = 0700 HR + 1500 HR, T 2 = 0900 HR + 1500 HR, and T 3 =0700 HR + 0900 HR + 1500 HR) were used for each nutrient solution. Leaf gas exchange parameters were studied during the vegetative and reproductive growth stages of sweet pepper cv. Papri new-E-red. Photosynthetic responses and its related parameters, namely transpiration (E), stomatal conductance (gS), and maximum photosynthesis (A max ), were significantly affected by nigari rates and nutrient solution application timing. Photosynthesis-related parameters, E, gS, A max , and initial slope of photosynthesis in response to light curve were the highest and light compensation point (LCP) and leaf vapor pressure deficit (LVPD) were the lowest at 2mL·L -1 nigari compared with the control at both plant vegetative and reproductive growth stages. For nutrient solution application timing, the highest E, gS, and A max were observed at T 3 treatment at both plant growth stages. Furthermore, marketable yield of sweet pepper was the highest when 2 mL·L -1 nigari was applied at 0700, 0900, and 1500 HR a day. Leaf gas exchange parameters showed that nutrient solution application timing of 0700, 0900, and 1500 HRa day was better for obtaining high yield of sweet pepper under nigari treatment in soilless culture.
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Effects of digested slurry on the arbuscular mycorrhizal colonization of Japanese lawn grass. 査読あり
Manabu Tobisa, Yoshinori Uchida, Yuto Mori, Yoshinori Ikeda, Yoki Asano, Masaaki Kirimura, Yasuhiro Sugimoto, Masahiko Hirata
Proceedings of the 4th Japan-China-Korea Grassland Conference 250 - 251 2012年3月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Yield and Nitrogen Recovery Rate in Two Forage Cropping Systems Supplied with Organic Fertilizers that Originated from Digested Effluent of Manure 査読あり
Sachiko Idota, Yoki Asano, Masaaki Kirimura, Yasuhiro Sugimoto, Yasuyuki Ishii
Proceedings of the 4th Japan-China-Korea Grassland Conference 148 - 149 2012年3月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Various effective cooling methods for plastic pipe house cultivation in summer 査読あり
Inden, H., Togou, Y., Kirimura, M., Rahman, M.J.
Acta Horticulturae 927 755 - 764 2012年2月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Acta Horticulturae
In Japan, ventilation, shading, air conditioning and other techniques are used for the countermeasures to the heating of the greenhouse in summer. The mist cooling by evaporation is one of the simple air conditioning and its initial and running cost is rather cheap. It has spread to be the most common air conditioning method. However, there is a problem of the spreading of diseases due to dewy plants, as a result of high relative humidity, so the suitable usage has not been clarified yet for the southwest warm humid district in Japan. Therefore, the objective of this experiment was to find out the effective use of mist cooling at various conditions. When outside temperature exceeded 30°C, in the most popular usual plastic pipe house, the air temperature fell by about 3°C by mist cooling compared with the control of no mist cooling. In the high truss plastic pipe house, around 4°C fell by mist cooling. Furthermore 1 to 2°C descent was possible by using together with the newly developed dehumidifier using triethylene glycol as a desiccant. Thermal insulation film and paint as shading materials were also tested to confirm temperature fall effect. Air temperature for all the shading materials was low, compared with the control PVC except one, and growth of plants increased. However, plants growth was not necessarily linear to the fall in the air temperature.
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Nepal, A.P., Sugimoto, Y., Nishiwaki, A., Kunitake, H., Anugroho, F., Kirimura, M., Muranaka, C.
European Journal of Scientific Research 52 ( 1 ) 123 - 131 2011年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：European Journal of Scientific Research
Microbial additive compost on microbial growth, activity and N mineralization of the soil amendments were examined, and their relationships were analyzed. Composts were prepared from commercial cattle manure with/without additive containing thermophilic bacteria. Soils unamended and amended compost with/without additive were incubated at 25oC for 125 days. The microbial additive increased microbial populations and activity during the first 13 days of incubation and accelerated N mineralization, which was enhanced throughout the rest of the incubation. Therefore, N mineralization can be increased by the increased microbial growth and activity caused by the microbial additive. © EuroJournals Publishing, Inc. 2011.
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Effects of microbial additive on composting process and on Swiss chard growth and nutrient uptake 査読あり
Nepal, A.P., Sugimoto, Y., Nishiwaki, A., Kunitake, H., Anugroho, F., Kirimura, M., Muranaka, C.
European Journal of Scientific Research 52 ( 1 ) 132 - 141 2011年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：European Journal of Scientific Research
We investigated the effect of a microbial additive on composting and on growth of Swiss chard (Beta vulgaris var. cicla). Composts were prepared from commercial cattle manure with/without a microbial additive containing thermophilic bacteria. Compost with microbial additive (AC) had greater temperature rise and microbial activity (measured by ATP levels) during first-phase composting than compost without additive (NAC), possibly because of increased thermophilic bacterial activity. Application of AC in Swiss chard cultivation gave higher SPAD values, photosynthetic activity, leaf yield, and nutrient contents than with NAC. The microbial additive including thermophilic bacteria produced good-quality compost that characterized by lower moisture and C:N ratio, and good growth of Swiss chard. © EuroJournals Publishing, Inc. 2011.
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Technical Efficiency Measurement and Estimation of the Efficiency Determinants of Citrus and Cereal Mix-farms in Mid-Hill, Nepal: A DEA Approach 査読あり
Krishna Lal Poudel, Naoyuki Yamamoto, Masaaki Kirimura,Yasuhiro Sugimoto, Arati Poudel Nepal and Bhima Dhungana
日本農業経済学会論文集 567 - 574 2009年12月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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シバおよびセンチピードグラスへの窒素施肥量の違いが季節生産性に及ぼす影響 査読あり
栢原 裕之, 霧村 雅昭, 杉本 安寛
芝草研究 37 ( 2 ) 98 - 102 2009年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：日本芝草学会