研究者業績
基本情報
- 所属
- 千葉大学 大学院園芸学研究院ランドスケープ・経済学講座 千葉大学 (教授)
- 学位
- 農学修士(京都大学)農学博士(京都大学)MS(京都大学)Doctor(京都大学)
- J-GLOBAL ID
- 200901033078280780
- researchmap会員ID
- 1000010056
経歴
7-
2021年4月 - 現在
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2020年4月 - 現在
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2016年4月
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2009年4月
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2006年2月 - 2009年3月
学歴
2-
1982年4月 - 1988年1月
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1978年4月 - 1982年3月
委員歴
6-
2018年4月 - 現在
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2017年4月 - 現在
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2021年4月 - 2023年3月
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2016年4月 - 2018年3月
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2014年4月 - 2017年3月
受賞
6-
2019年3月
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2015年3月
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2015年3月
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2002年
論文
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Technology in Horticulture 3(1) 2023年9月 査読有り最終著者
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Heliyon 9(6) e16823-e16823 2023年6月 査読有り最終著者
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Acta Horticulturae (1369) 211-220 2023年5月 査読有り最終著者
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Acta Horticulturae (1369) 133-140 2023年5月 査読有り最終著者
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Frontiers in Plant Science 13 2022年9月8日 査読有り最終著者Since the introduction of LED lamps a decade ago, the plant factory with artificial lighting (PFAL) has been expected to be a savior that overcomes the food crisis, brings food safety, and enhances environmental friendliness. Despite such high expectations, the diffusion of commercial crop production in PFALs has been slow. It has been said that the main reason for this is the huge initial investment required to construct PFALs. This situation has attracted studies to access the economic feasibility of the crop production in PFALs. One thing strange in these studies is that they pay little attention to the scale of their PFALs. PFALs are factories so that they would be subject to economies of scale. If so, the scale of PFALs is an important factor that determines the economic feasibility of plant production in PFALs. However, no study has thus far attempted to examine whether economies of scale exist in the construction of PFALs. To fill this gap, this paper tries to examine, based on the data on the investment cost of PFAL construction collected from various countries and regions in the world, whether economies of scale exist in PFAL construction and, if yes, how it affects the economic viability of the plant production in PFALs by searching for the minimum scale that ensures PFAL crop production economically viable. The results show that economies of scale exist in PFAL construction, and that the production of lettuce, PFALs’ most popular crop, is now well on a commercial basis with the technology level of the most advanced PFAL operators, but strawberries has not reached that stage yet. It is also shown that crop production in PFALs is highly sensitive to changes in the yield and the price of the crops: A 30% decline either in the yield or the price of lettuce would easily bring PFALs bankruptcy. It is discussed that the optimum scale of PFALs would depend not only on the economies of scale but also on the transaction costs, such as the costs of searching and keeping a sufficient number of buyers who offer good and stable crop prices.
MISC
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Plant Factory: An Indoor Vertical Farming System for Efficient Quality Food Production xxv-xxvi 2015年10月26日
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北陸作物学会報 (46) 96-98 2011年エンサイ(Ipomoea aquatica Forsk.)の育種における発育調節技術を確立するために,植物育成用蛍光灯を用いて照射量と照射時間を変化させ,花芽形成に及ぼす影響を調査した.その結果,短日条件における,PPFD200μmol m^<-2>s^<-1>の光条件で花芽が形成されることが明らかとなった.1日10時間照射,PPFD200μmol m^<-2>s^<-1>の光条件では28日目に開花した.
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Environmental Control in Biology 44(4) 265-277 2006年Inorganic substances found in wastewater (i.e. industrial, agricultural, and urban-sewage runoff) constitute a form of abiotic stresses for plants, negatively impacting their growth, development, and productivity. The aim of this investigation is to establish an effective in-vitro selection system, to identify water spinach varieties displaying higher tolerance to inorganic salts and evaluated temperature. High inorganic salt concentrations (171 mM NaCl or 125 mM KH2PO4 strongly retarded chlorophyll concentration and relative water content, led to growth reduction, and decreased the seedling survival percentage of a commercial variety of water spinach. The fresh weight, shoot height, and leaf number of seedlings grown under inorganic stresses were also strongly decreased when compared to unstressed control seedlings. Moreover, seedlings grown at high temperature (30 ± 2°C) exhibited 4-folds reduction in survival percentage compared to those grown at low temperature (10±2°C). An in-vitro selection system was then applied to screen 54 varieties of water spinach. The results indicated that 10 varieties processed increased tolerance to high inorganic salt levels and evaluated temperature. These tolerant varieties should be further investigated in filed trials for vegetable production, contaminant absorption, and wastewater treatment. Conversely, the sensitive varieties may potentially be used as indicators for pollutant contamination in wastewater.
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Environmental Control in Biology 43(2) 105-112 2005年Tomatoes (cv. "Momotaro Fight") were grown in a bag culture with a drip irrigation system using coconut coir as a substrate. An efficient fertigation management system using integrated solar radiation and vapor pressure deficit (VPD) were conducted in order to confirm the efficiency of the system and to obtain the data of transpiration rate (E). With this system nutrients and water were supplied when the cumulative solar radiation (CSR) reached a value of 1 MJ m2, setting the supply volume (per 1 plant-1 MJ-1 m2) was gradually increased depending on the growth stages. The E value of tomato was measured using a weighing lysimeter. The E data obtained from the V-100 treatment which was associated with the highest water and nitrate use efficiency, were used to perform linear regression equation for the estimation of E value relating either VPD and/or CSR. The linear regression equation of E value fitted moderately well with both VPD and CSR. Therefore, a more suitable fertigation system could be developed based on the estimation of the E value with VPD and CSR values. Moreover, the linear regression equation obtained could be applied for developing fertigation management system in tomato bag culture under wide range of greenhouse conditions.
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Environmental Control in Biology 43(2) 97-103 2005年In order to develop the feasible fertigation system, tomatoes "Momotaro Fight" were grown in bag culture system with drip irrigation equipments using coconut coir as substrate. The growth stage was separated into 5 stages for supply different amounts of nutrients and water. In this system the setting amount of nutrient was supplied when the cumulative solar radiation (CSR) value reached 1 MJ m2. The setting amounts increased gradually (from 0.23-0.40 me plant 1 MJ-1 m2) with the process of growth stage. There were 4 treatments with varying levels of water supply for vapor pressure deficit (VPD) as follows: V-0 (no additional supply of water), V-20, V and V-20. In the V-0 treatment, the highest contents of total soluble solids in the fruits were recorded, while the values of the leaf dry weight, photosynthetic rate and yield were the lowest. The V and V+20 treatments were associated with a lower percentage of drainage (5-7%), higher water use efficiency and nitrate use efficiency while salt accumulation inside the substrate could be avoided. With these 2 treatments a highly efficient fertigation system based on CSR and VPD values was developed for the production of low truss tomato production system.
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Environmental Control in Biology 43(1) 13-20 2005年Tomato plants were grown in a bag culture system with a drip irrigation system using coconut coir as substrate. For the treatments the same volume of nutrient solution (50 mL) with 2 different amounts of NO3-N (0.4 and 0.5 me plant-1 MJ-1 m-2) was supplied when cumulative solar radiation value reached 1 MJ m-1. Different volumes of water were supplied at the same time as the supply of nutrients. There were 4 additional water supply treatments with varying amounts of water supply for vapor pressure deficit as follows: V-0 (no additional water supply), V-1, V-2, and V-3, respectively with the total of 8 treatments. In the V-0 treatments with both Of NO3-N amounts, the contents of total soluble solids in the fruits were the highest, while the leaf dry weight, photosynthetic rate and yield were the lowest. This study revealed that a concentration of 0.4 me NO3-N plant-1 MJ-1 m-1 was the optimum for tomato production in this system, The 0.4V-3 treatment was associated with a low percentage of drainage, high water use efficiency and high nitrate use efficiency. The recommendation for fertigation management consisting of varying the amounts of NO3-N and of additional water depending on the data of NO3-N consumption in the 0.4V-3 treatment was explained.
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Japanese Journal of Tropical Agriculture 49(1) 45-52 2005年
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Environmental Control in Biology 43(2) 97-103 2005年In order to develop the feasible fertigation system, tomatoes "Momotaro Fight" were grown in bag culture system with drip irrigation equipments using coconut coir as substrate. The growth stage was separated into 5 stages for supply different amounts of nutrients and water. In this system the setting amount of nutrient was supplied when the cumulative solar radiation (CSR) value reached 1 MJ m2. The setting amounts increased gradually (from 0.23-0.40 me plant 1 MJ-1 m2) with the process of growth stage. There were 4 treatments with varying levels of water supply for vapor pressure deficit (VPD) as follows: V-0 (no additional supply of water), V-20, V and V-20. In the V-0 treatment, the highest contents of total soluble solids in the fruits were recorded, while the values of the leaf dry weight, photosynthetic rate and yield were the lowest. The V and V+20 treatments were associated with a lower percentage of drainage (5-7%), higher water use efficiency and nitrate use efficiency while salt accumulation inside the substrate could be avoided. With these 2 treatments a highly efficient fertigation system based on CSR and VPD values was developed for the production of low truss tomato production system.
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Jpn. J. Tropic. Sci. 48(3) 173-180 2004年9月 査読有り6種類の有機質資材, ピートモス: もみ殻 (PM: RH) , ピートモス: 落花生莢くん炭 (PM: PHC) , やし殻: もみ殻 (CC: RH) , やし殻: 落花生莢くん炭 (CC: PHC) , もみ殻くん炭: もみ殻 (RHC: RH) , もみ殻くん炭: 落花生莢くん炭 (RHC: PHC) , バガスチャコール: もみ殻 (BGC: RH) およびバガスチャコール: 落花生莢くん炭 (BGC: PHC) をそれぞれ1: 1の比 (v/v) で均一に混合し, レタスおよびキャベツ育苗用培地としての可能性を市販の育苗用培養土 (COM) (セル培土: スミリン農産工業株式会社) と比較した.PHCを含む培地で育苗したレタス苗では草丈, 葉面積, 茎/根率, 全体の乾物重の値がRHを含む培地での値より大きくなった.レタス苗ではどの培地においても外見上の違いは見られなかった.PM: PHCおよびCC: PHCで育苗したキャベツ苗では葉面積および全体の乾物重値が他の有機質培地での値より大きくなった.その上, CC: PHCおよびPM: PHCの生育調査ではほぼ同じような値が見られた.CC: PHCおよびBGC: PHCにおける高ECや, CCを含む培地における高Naはどちらの苗の生育にも影響を及ぼさなかった.最終的に, 熱帯地域でのコストや利用性を考慮すると, RHおよびCCを含む培地がレタスおよびキャベツの育苗にそれぞれ効果的であると結論した.
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Japanese Journal of Tropical Agriculture 48(4) 246-252 2004年
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熱帯農業 47(4) 260-265 2003年12月1日熱帯における野菜の育苗に,ピートモスを主体とした輸入培養土を用いることは高価であり,非現実的である.このため,熱帯地城で産出される安価な有機質培地が利用できれは,育苗生産コストを抑えることが可能であると思われる.しかしこのような有機質培地の物理性および化学性に関する情報は少ない.そこで,熱帯地域で産出される有機質培地の性質を調査した.供試有機質培地は,やし殼(CC),もみ殼(RH),もみ殼くん炭(RHC),落花生莢くん炭(PHC),バガスチャコール(BGC)および対照のピートモス(PM)とした.これらの培地の物理性を調べたところ その気相率から1)低気相率培地,PM (27%),CC (34%),RHC(36%)とBGC(37%),および2)高気相率培地, RH (71%)とPHC(53%)の二つのグループに分けることができたため、気相率の低い培地と高い培地を組み合わせ,1:1の比(v/v)で均一に混合しそれら混合培地の物理性(仮比重, BD,総孔隙率,TP,容水量,WHC,気相率, AP)および化学性(土壌溶液中oH,EC,無機成分含量)の特徴について調査した.混合培地の仮比重は109-123 mg・cm^<-3>にあり,容水量および気相率はそれぞれ48-56および26-36%の範囲に納まった.すなわち,全ての混合拓地は,野菜の育苗ための適切な物理性の範囲を持ち,化学性としても,PM . PHC, RHC:RHおよびBGC:RH混合培地は適切なEC値の範囲(0.4-1.0dSm^<-1>)にあった.以上より,熱帯地域で産出される有機物を用いることによって,安価で安定した育苗培他の開発が可能であると言える.
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園芸学会雑誌. 別冊, 園芸学会大会研究発表 72(1) 88-88 2003年4月4日
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Jpn, J. Tropic. Agric. 47(2) 61-69 2003年地下水の過剰利用や地球環境の変化により, 旱害は農業生産において深刻な問題となりつつあることから, 乾燥条件下における植物生理の理解を深め, 乾燥ストレス耐性を付与した品種育成を目的とした研究が急務となっている. Capsicum annuum L.の中で, タイチリとニューエースは環境ストレスに対して対照的な反応を示す品種として知られていることから, この2品種を用いて乾燥ストレスに対する生理的反応を調査した.乾燥ストレス処理に際し, ヒートパルス法によるサップフロー, 気孔コンダクタンス, 葉の水ポテンシャルの測定を行った. タイチリは乾燥に対してより高い感受性を示し, 水分供給量が限られている場合に蒸散による余分な水分損失を押さえていると思われた.また, 潅水を再開した後の, サップフロー, 気孔コンダクタンス, 葉の水ポテンシャルの回復はタイチリの方がニューエースよりも早かった. さらに, 一度乾燥ストレス処理を受けた植物は二度目のストレス処理の際に, 以前に乾燥ストレスを受けていない植物よりも強い乾燥ストレス耐性を示した. 品種間における形態, 生理的な違い, つまり, 葉や根の構造, 及び, 乾燥に対する水ポテンシャル調整機能の違いが, 乾燥ストレスに対する反応の違いをもたらしたと考えられた.
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CROP SCIENCE 42(3) 822-826 2002年5月Single-node leafy cuttings of sweetpotato [Ipomoea batatas (L.) Lam. cv. Beniazuma] plants can be used to produce low-cost, pathogen-free sweetpotato plug transplants. This study was conducted to determine the effects of plug volume and root removal on sweetpotato growth and yield after planting in the field. The yield and growth of sweetpotato plants from transplants with 4 to 6 unfolded leaves (about 0.14-m shoot length) produced in 55- or 35-mL multicell plug trays, then planted intact or without roots were compared with a control treatment of unrooted conventional cuttings (about 0.3-m-long terminal vine cutting with 7 to 8 unfolded leaves). The plug transplants were grown from single node leafy cuttings under artificial light. Intact plug transplants (35 or 55 mL) produced 39 to 40 Mg ha(-1) of storage roots 128 d after planting in the field, 11 to 12 Mg ha(-1) greater than the control treatment. After 128 d of field growth, plug transplants (35 mL, with roots) gave a percent harvest index of 79%, 7% greater than the control. The maximum length and diameter of storage roots were, respectively, 271 and 68 mm when plug transplants were used (35 mL, with roots), and were, respectively, 58 mm longer and 18 mm wider than the control. Overall, growth and yield from plug transplants were significantly higher than from conventional cuttings, regardless of of the plug volume or root removal. Plug transplants with intact roots produced greater growth and yield regardless of plug volume than did plug transplants without roots.
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Application of capillary hydroponic system to the lettuce: Growing under tropical climate conditionsPROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON GROWING MEDIA AND HYDROPONICS (548) 401-408 2001年Leaf lettuce (Lactuca saliva L., cv. Red Fire) was grown by Capillary hydroponic system without electricity use to improve the system for tropical climate conditions. The polyester capillary mat was put on the floating styrol board (with or without slope) and covered with substrates originated in tropical countries (rice husk, rice husk charcoal and coconut coir) with or without mulching film. The seedlings were transplanted on the capillary mat and the root system was covered with substrates. Mulching film and the slope of floating board did not affect the yield and quality of lettuce. Rice husk charcoal was found to be the best substrate in spring and autumn, while coconut coir was found to be the best in summer. Tip-burn symptom was found in the plants grown in newly used coconut coir. But the symptom disappeared by using reused coconut coir and plants performed better than using rice husk substrate. We concluded this system is one of feasible hydroponic methods for leaf vegetable production under tropical conditions. The appropriate control of nutrient solution was also discussed.
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千葉大学園芸学部学術報告 51 227-230 1997年3月28日イチジクの挿し穂に対する挿し木前処理の温度および培地水分率と処理日数が挿し木70日後の発根および新梢発生におよぼす影響を調査した.[tabel]挿し穂の水分含有率は,温度,培地水分率共に高い処理で高くなった.また,いずれの処理においても5日目には有意に高い値を示していた.発根率,新梢発生率は5℃では培地水分率の影響は見られなかった.10℃では30%で大きな値となった.発根本数,総根長,根乾物重は10℃では30%で大きな値となった.新梢乾物重は温度,培地水分率共に高い処理で高くなった.挿し穂の水分含有率と根乾物重,新梢乾物重の間には,前処理日数別に正の相関があった.本試験では,挿し穂の水分含有率が高い場合には,前処理温度および処理日数は発根に対する影響はなかった.本試験の結果,長期貯蔵により低下したイチジク休眠枝の発根率を高めるには,調整後の挿し穂を,10〜20日間,高い培地水分率(3.0%)条件下で貯蔵することが適していると考えられた.また,10℃での貯蔵も効果があることがわかった.
書籍等出版物
18講演・口頭発表等
15担当経験のある科目(授業)
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14共同研究・競争的資金等の研究課題
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日本学術振興会 科学研究費助成事業 2015年4月 - 2018年3月
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日本学術振興会 科学研究費助成事業 2010年 - 2012年
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日本学術振興会 科学研究費助成事業 2009年 - 2011年