Faculty Profiles - MAEDA Morihiro

Papers - MAEDA Morihiro

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Nitrous oxide emission from sediment of a tropical mangrove forest in Central Vietnam–implications of short-term laboratory experiments Reviewed

Ha, T.K.T, M. Maeda, T.N.A. Ha

Journal of Environmental Science for Sustainable Society 7 1 - 8 2016

Effects of pH and oxygen on phosphorus release from agricultural drainage ditch sediment in reclaimed land, Kasaoka Bay, Japan Reviewed

Huy Van Nguyen, Morihiro Maeda

Journal of Water Environment and Technology 14 ( 4 ) 228 - 235 2016

Nitrate Movement, Transformation, and Accumulation Following Diverse Nitrogenous Fertilizer Regimes in Arable Soils Reviewed

Bandunee Champika Liyanage, Masafumi Tateda, Morihiro Maeda, Michihiko Ike, Masanori Fijita

Journal of Agriculture and Ecology Research Inernational 8 ( 4 ) 1 - 17 2016

Nitrous oxide and carbon dioxide emissions from paddy soil treated with rice husk products at different moisture contents in a short-term experiment Reviewed

Ha, T.K.T, M. Maeda, T. Fujiwara, H. Nagare, S. Akao, T.Q. Tran

Journal of Environmental Science for Sustainable Society 7 9 - 15 2016

Effects of soil type and nitrate concentration on denitrification products (N2O and N-2) under flooded conditions in laboratory microcosms Reviewed

Thi Kim Thanh Ha, Morihiro Maeda, Taku Fujiwara, Hideaki Nagare, Satoshi Akao

SOIL SCIENCE AND PLANT NUTRITION 61 ( 6 ) 999 - 1004 2015.11

Language：English Publishing type：Research paper (scientific journal) Publisher：TAYLOR & FRANCIS LTD

Denitrification products nitrous oxide ((N2O) and nitrogen (N-2)) were measured in three flooded soils (paddy soil from Vietnam, PV; mangrove soil from Vietnam, MV; paddy soil from Japan, PJ) with different nitrate (NO3-) concentrations. Closed incubation experiments were conducted in 100-mL bottles for 7d at 25 degrees C. Each bottle contained 2g of air-dried soil and 25mL solution with NO3- (concentration 0, 5 or 10mgNL(-1)) with or without acetylene (C2H2). The N2O + N-2 emissions were estimated by the C2H2 inhibition method. Results showed that N2O + N-2 emissions for 7d were positively correlated with those of NO3- removal from solution with C2H2 (R-2=0.9872), indicating that most removed NO3- was transformed to N2O and N-2 by denitrification. In PJ soil, N2O and N-2 emissions were increased significantly (P<0.05) by the addition of greater NO3- concentrations. However, N2O and N-2 emissions from PV and MV soils were increased by the addition of 0 to 5mgNL(-1), but not by 5 to 10mgNL(-1). At 10mgNL(-1), N-2 emissions for 7d were greater in PJ soil (pH 7.0) than in PV (pH 5.8) or MV (pH 4.3) soils, while N2O emissions were higher in PV and MV soils than in PJ soil. In MV soil, N2O was the main product throughout the experiment. In conclusion, NO3- concentration and soil pH affected N2O and N-2 emissions from three flooded soils.

DOI： 10.1080/00380768.2015.1094747

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Combined use of sugars and nutrients derived from young maize plants for thermophilic L-lactic acid fermentation Reviewed

S. Akao, H. Nagare, M. Maeda, K. Kondo, T. Fujiwara

INDUSTRIAL CROPS AND PRODUCTS 69 440 - 446 2015.7

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Fermentation of lignocellulosic biomass requires auxiliary materials such as nutrients for fermentation. Because of the low prices of fermentation products such as bioethanol, the costs of nutrients are not negligible. We have developed the concept of using substances natively present in lignocellulosic biomass as nutrients for the downstream fermentation. The leaves and stalks of young dent corn plants were used as biomass and the nutrients were recovered by soaking them in water before alkaline pretreatment, followed by enzymatic saccharification and fermentation. Performing thermophilic L-lactic acid fermentation using these recovered nutrients support their use as commercially feasible alternatives. A level of recovered nutrients of 40% was sufficient to support the fermentation of recovered sugars derived from the same corn biomass. However, the amount of recovered nutrients required for fermentation was almost double that when using yeast extract based on the amounts of nitrogen and/or phosphorus added. The nitrogen and phosphorus balances in the process indicated that adding nutrients was crucial for promoting fermentation based on the amounts of nitrogen and phosphorus. The nutrients proposed were considered to be effective for fermenting biomass pretreated by alkaline, dilute add, and hydrothermal methods. (C) 2015 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.indcrop.2015.02.055

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Nutrient Mass Balances in Intensive Shrimp Ponds with a Sludge Removal Regime: A Case Study in the Tam Giang Lagoon, Central Vietnam Reviewed

Nguyen, H.V, Morihiro M

Journal of Agricultural Science and Technology A and B 5 539 - 548 2015

Characteristics of Nutrient Salt Uptake Associated with Water Use of Corn as a Catch Crop at Different Plant Densities in a Greenhouse

D. Yasutake, C. Kiyokawa, K. Kondo, R. Nomiyama, M. Kitano, M. Mori, S. Yamane, M. Maeda, H. Nagare, T. Fujiwara

PEDOSPHERE 24 ( 3 ) 339 - 348 2014.6

Language：English Publishing type：Research paper (scientific journal) Publisher：SCIENCE PRESS

Dent corn, as a catch crop used for salt removal, was cultivated at different densities, i.e., 7.3 (low density), 59.7 (normal density), and 119.5 plants m(-2) (high density), during a 50 d fallow period after cultivation of a commercial crop in a greenhouse, to analyze the characteristics of nutrient salt (N, K, Mg, and Ca) uptake by roots and to study the effect of plant density on the characteristics associated with crop water use. Leaf area index for the high and normal density treatments reached extremely high values of 24.3 and 14.9, respectively. These values induced higher transpiration rates that were estimated using the Penman-Monteith model with the incorporation of specific parameters for crop and greenhouse conditions. The total N, K, Mg, and Ca contents in the crop canopy at harvest were 26.8, 13.0, 1.0, and 1.7 g m(-2), respectively, under the high density treatment. The dynamics of salt uptake rates for high, normal, and low density treatments were evaluated by assessing weekly changes in salt content, and were subsequently compared against the transpiration rate. A positive linear relationship was obtained between these 2 parameters for: all 3 density treatments and all tested salts. Hence, higher transpiration rates caused higher salt uptake rates through water absorption. On the other hand, salt uptake efficiency per unit water use by cultivation was lower in the low density treatment. Therefore, management procedures with dense planting that induce higher transpiration rates and lower evaporation rate are extremely important for the effective cultivation of corn catch crops.

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ベトナム中部沿岸地域における安全野菜栽培と慣行栽培の比較－肥培管理と土壌・地下水への影響－ Reviewed

前田守弘, 茅野瑛介, 西村悠史, グエンバンヒュイ, 若井ニッタヤー, 蜂谷拓郎

地域地理研究 20(1) 22 - 31 2014

肥作物鋤き込みによる土壌還元消毒時の一酸化二窒素発生と被覆資材の違いが与える影響

石岡厳, 前田守弘, 渡邊修一, 竹原利明

日本土壌肥料学雑誌，85(4) 341 - 348 2014

Cascade utilization of water chestnut: recovery of phenolics, phosphorus, and sugars

Satoshi Akao, Koutaro Maeda, Yoshihiko Hosoi, Hideaki Nagare, Morihiro Maeda, Taku Fujiwara

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 20 ( 8 ) 5373 - 5378 2013.8

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER HEIDELBERG

Overgrowth of aquatic plants, such as water chestnut, has been reported as a regional problem in various areas. We proposed cascade utilization of water chestnut through the recovery of phenolics, phosphorus, and sugars. Phenolics were extracted using 50 g (wet weight) of biomass with 300 mL of acetone, methanol, or hot water, and the yields of total phenolics were 80.2, 56.2, and 49.7 mg g(-1) dry weight of native biomass, respectively. The rate of eluted phosphorus in the phenolic extraction step was 8.6, 14.8, and 45.3 % of that in the native biomass, respectively, indicating that the use of polar organic solvents suppressed phosphorus elution at the phenolic extraction step. Extraction of phosphorus following the phenolic extraction was combined with alkaline pretreatment (1 % NaOH solution) of biomass for saccharification; 64.1 and 51.0 % of phosphorus in the native biomass were extracted using acetone and methanol for the phenolic extraction, respectively. Saccharification following the alkaline pretreatment showed that the glucose recovery rates were significantly increased (p < 0.05) with the phenolic extraction step compared to alkaline pretreatment alone. This finding indicates that extraction of phenolics not only provides another useful material but also facilitates enzymatic saccharification.

DOI： 10.1007/s11356-013-1547-7

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Groundwater-induced emissions of nitrous oxide through the soil surface and from subsurface drainage in an Andosol upland field: A monolith lysimeter study

Kazunori Minamikawa, Sadao Eguchi, Seiichi Nishimura, Hirotaka Ihara, Morihiro Maeda, Kazuyuki Yagi, Michio Komada

SOIL SCIENCE AND PLANT NUTRITION 59 ( 1 ) 87 - 95 2013.2

Language：English Publishing type：Research paper (scientific journal) Publisher：TAYLOR & FRANCIS LTD

Nitrous oxide (N2O) produced in shallow groundwater has two emission pathways to the atmosphere: dissolution in subsurface drainage and groundwater and later degassing from water surfaces open to the atmosphere, and upward gas diffusion. N2O undergoing upward diffusion through the soil surface cannot usually be distinguished from N2O produced in the topsoil. To evaluate the emission pathway and rate of groundwater-induced N2O, we conducted a one-year experiment using monolith lysimeters containing 1m-long undisturbed Andosol. We measured emission of N2O via the soil surface and dissolved N2O emitted via subsurface drainage from the non-planted lysimeters under two conditions without fertilizer-nitrogen (N) addition: (1) with the groundwater table at 0.9 m depth (GW), and (2) without any groundwater table (nonGW). Total soil surface N2O emissions in the GW and nonGW treatments were 21.0 +/- 6.3 and 17.0 +/- 1.1mgNm2yr1, respectively (mean +/- standard error, n=3), and the difference between the two treatments was not significant. Total dissolved N2O emissions via drainage in the GW and nonGW treatments were 11.40 +/- 5.68 and 0.42 +/- 0.03mgNm2yr1, respectively. The presence of groundwater significantly increased dissolved N2O emission under zero fertilizer-N addition. This is due to the one to three orders of magnitude higher concentration of dissolved N2O in the GW treatment. Our results indicate that the presence of groundwater increases total N2O emissions from an Andosol upland field via these two pathways.

DOI： 10.1080/00380768.2012.740606

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Seasonal changes in the performance of a catch crop for mitigating diffuse agricultural pollution Reviewed

K. Kondo, K. Inoue, T. Fujiwara, S. Yamane, D. Yasutake, M. Maeda, H. Nagare, S. Akao, K. Ohtoshi

Water Science and Technology 68 ( 4 ) 776 - 782 2013

Language：English Publishing type：Research paper (scientific journal)

An in situ technology for mitigating diffuse agricultural pollution using catch crops was developed for simultaneously preventing nitrate groundwater pollution, reducing nitrous oxide (N2O) gas emissions, and removing salts from the topsoil. Seasonal changes in the performance of a catch crop were investigated using lysimeters in a full-scale greenhouse experiment with 50 d cultivation of dent corn. Catch crop cultivation significantly reduced the leached mineral nitrogen by 89-91% in summer, 87-89% in spring, and 61-82% in winter, and it also significantly reduced the N2O emission by 68-84% in summer. The amounts of nitrogen uptake by the catch crop were remarkably higher than those of leached nitrogen and N2O emission in each season. Catch crop cultivation is a promising technology for mitigating diffuse agricultural pollution. © IWA Publishing 2013.

DOI： 10.2166/wst.2013.258

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Effect of pH on phosphate adsorption onto semi-intensive shrimp pond sediment Reviewed

Nguyen V. H, M. Maeda

Vietnam Journal of Agriculture and Rural Development 71 - 76 2012

Comparison of simultaneous and separate processes: saccharification and thermophilic L-lactate fermentation of catch crop and aquatic plant biomass

Satoshi Akao, Koutaro Maeda, Shingo Nakatani, Yoshihiko Hosoi, Hideaki Nagare, Morihiro Maeda, Taku Fujiwara

ENVIRONMENTAL TECHNOLOGY 33 ( 13 ) 1523 - 1529 2012

Language：English Publishing type：Research paper (scientific journal) Publisher：TAYLOR & FRANCIS LTD

Catch crop candidates (corn, guinea grass) for recovering nutrients from farm soil and aquatic plants (water caltrop, water hyacinth) were utilized to produce L-lactic acid. The efficiencies of pre-treatment methods for enzymatic saccharification and L-lactate production of two fermentation processes, thermophilic simultaneous saccharification and fermentation (SSF), as well as separate saccharification and fermentation, were compared. Conditions were set at 55 degrees C and pH 5.5 for non-sterile fermentation. Alkaline/peroxide pre-treatment proved the most effective for saccharification in pre-treated corn, guinea grass, water caltrop and water hyacinth with glucose yields of 0.23, 0.20, 0.11 and 0.14 g/g-dry native biomass (24-hour incubation period), respectively. Examination of the two types of thermophilic L-lactate fermentation employed following alkaline/peroxide pre-treatment and saccharification demonstrated that the L-lactate yield obtained using SSF (0.15 g/g in the case of corn) was lower than that obtained using separate saccharification and fermentation (0.28 g/g in the case of corn). The lower yield obtained from SSF is likely to have resulted from the saccharification conditions used in the present study, as the possibility of cellulase deactivation during SSF by thermophilic L-lactate producing bacteria existed. A cellulase that retains high activity levels under non-sterile conditions and a L-lactate producer without cellulose hydrolysis activity would be required in order for SSF to serve as an effective method of L-lactate production.

DOI： 10.1080/09593330.2012.669412

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クリーニングクロップ導入によるナス施設栽培休閑期における栄養塩溶脱負荷の削減

前田守弘, 仲宗根安弘, 岡本啓史, 浅野裕一, 藤原拓, 永禮英明, 赤尾聡史

土木学会論文集G（環境） 7 Ⅲ_103-Ⅲ_111 - ?_111 2012

Nutrient recovery from biomass cultivated as catch crop for removing accumulated fertilizer in farm soil Reviewed

H. Nagare, T. Fujiwara, T. Inoue, S. Akao, K. Inoue, M. Maeda, S. Yamane, M. Takaoka, K. Oshita, X. Sun

WATER SCIENCE AND TECHNOLOGY 66 ( 5 ) 1110 - 1116 2012

Language：English Publishing type：Research paper (scientific journal) Publisher：IWA PUBLISHING

As a result of long-term continuous use of fertilizers in farm land, a large amount of nutrients accumulate in the soil, increasing the risk of eutrophication or nitrate pollution of groundwater. For rehabilitating the farm soil and recovering nutrients such as nitrogen, phosphorus and potassium, a new system has been developed by our research group. This paper discusses the methodology of extracting nutrients from biomass in order to recover phosphorus and other nutrients in crystal form. Around 80% or higher extraction rates were achieved for phosphorus and potassium by soaking the powdered tissue in distilled water or 1% NaOH solution for 24 h. The extracted phosphorus and potassium act as a potential resource for recycled fertilizer or other industrial materials.

DOI： 10.2166/wst.2012.291

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ベトナム中部フエ県の農業と水利 Reviewed

石黒宗秀, トランティツハ・ファムビエットズン, 前田守弘

農業農村工学会誌 79 ( 5 ) 359 - 362 2011

回収・再資源化を目的としたバイオマスからの元素抽出 Reviewed

永禮英明, 藤原拓, 赤尾聡史, 前田守弘, 山根信三

土木学会論文集G（環境) 48 461 - 466 2011

ソフトバイオマスを原料とした酵素糖化における各種前処理の糖化効率比較 Reviewed

前田光太郎, 赤尾聡史, 細井由彦, 永禮英明, 前田守弘, 藤原拓

土木学会論文集G（環境) 48 433 - 440 2011

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