Papers - JITSUNO Masataka
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Estimating irrigation water amounts for tomato cultivation using observed meteorological data in Djibouti
WATANABE Fumio, SUZUKI Shinji, MOHAMED Tabarek Ismael, JITSUNO Masataka, OHSHIMA Hiroyuki, SANADA Atsushi, SHINOHARA Takashi
Journal of Arid Land Studies 32 ( 3 ) 81 - 81 2022.12
Language：English Publisher：The Japanese Association for Arid Land Studies
<p>Irrigation is essential for crop cultivation in dry and semi-arid areas with limited rainfall and water resources. Efficient and effective use of water resources is required but saving irrigation water is important. The study area is in Ali Faren farm located in west of Djibouti which lies in the Horn of Africa. Djibouti is a very dry region with annual rainfall of about 150 mm and an average annual temperature of 28.6°C. Due to such meteorological conditions, water resources depend mostly on groundwater, and this makes water extremely scare. Therefore, water saving in the agricultural field is indispensable.</p><p>This study aims at effective and efficient use of irrigation water in Djibouti. The appropriate irrigation water for tomato cultivation were estimated using CROPWAT provided by FAO and observed meteorological data at Ali Faren farm in Djibouti. The observed meteorological data include air temperature, relative humidity, wind speed and sunshine hour. The conditions required for calculating the amount of irrigation water were medium loam soil texture based on the laboratory results of soil particle size test, and the tomato cultivation period from October to March according to the local farmers.</p><p>The result showed that the average monthly reference evapotranspiration was 5.7 mm/day annually. Reference Evapotranspiration was maximum in July with 7.9 mm/day and minimum in December with 3.9 mm/day. It was observed that the effective rainfall from October to March was 55.2 mm which corresponds to the local tomato cultivation period. Additionally, the required water amount for tomato crops varied between 2.9 to 4.2 mm/day.</p><p>Finally, the appropriate irrigation area of this farm will be determined based on the measured amount of groundwater discharge at an existing well and the estimated irrigation water amount.</p>
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Optimization of irrigation depth for mungbean considering the cost for water under a saline condition
FUJIMAKI Haruyuki, TODERICH Kristina, ABD EL BAKI Hassan M., SAITO Tadaomi, ONISHI Junya, JITSUNO Masataka
Journal of Arid Land Studies 32 ( 3 ) 90 - 90 2022.12
Language：English Publisher：The Japanese Association for Arid Land Studies
<p>We have presented a new scheme, “optimized irrigation”, in which irrigation depth is determined such that net income considering the price of water and weather forecasts during each interval is maximized using WASH_1D/2D which are numerical simulation models of water flow and solute transport in soils and crop growth. To evaluate whether the optimized irrigation is also able to restrict salinity stress and avoid salinization without any intentional leaching, we carried out an irrigation experiment.</p><p>Mungbean (<i>Vigna radiata L.</i>) was grown in a greenhouse in Arid Land Research Center, Tottori University, using a drip irrigation system whose emitter distance was 20 cm and lateral spacing was 60 cm. Seeds were sown on May 18 below each emitter after leaching with more than 200 mm. Three treatments were established: 1) irrigation with fresh water (F), 2) irrigation with 1.5 g/L of NaCl solution (C), 3) irrigation with 1.5 g/L of NaCl solution and irrigation depth was determined with the proposed scheme (O). Treatments F and C were irrigated with automated irrigation systems using two tensiometers each installed below 10 cm. Each treatment had three replicates. After June 12, irrigation using the saline water started for treatments C and F. A 2.8 mm of leaching was carried out on July 2.</p><p>Treatment F received the largest amount owing to the largest transpiration rate without any stresses. Treatment C received the lowest amount because of low transpiration rate due to severe salinity stress. We compared net income under producer price of 0.9 $/kg, common miscellaneous costs at 50 $/ha, water price of fresh water at 0.2 $/m<sup>3</sup> and that of saline water 0.1 $/m<sup>3</sup>. Treatment F gained the highest gross income owing to the largest yield (835 kg/ha). Treatment C gained the lowest income and yield (448 kg/ha) while treatment O gained the highest net income owing to lower cost for water than that for F, revealing the effectiveness of the proposed scheme.</p>
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Research on solar desalination system and water-saving farming methods for small-scale farmers Reviewed
Masataka JITSUNO, Takahisa JITSUNO, Kaoru HAMABE, Keiu TOKUMURA
Journal of Arid Land Studies 32 ( S ) 199 - 203 2022
Authorship：Lead author Language：English Publishing type：Research paper (international conference proceedings)
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Development of Solar Desalination Equipment for Teaching Using Solar Heat Reviewed
Masataka JITSUNO, Kenji SATO, Kaoru HAMABE, Takahisa JITSUNO
62 ( 2 ) 151 - 157 2020
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Proposal and Practice of Physical Computing Teaching Materials for Teacher License Renewal Courses at the Tokyo University of Agriculture Reviewed
64 ( 3 ) 83 - 91 2019
Authorship：Lead author Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
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技術科教育における鋸挽きジグの開発 Reviewed
實野雅太，星野欣也
東京農大農学集報 61 ( 2 ) 60 - 66 2017
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
中学校技術科教育の木材加工領域において、鋸の操作に慣れるための鋸挽きジグの開発を目指した。安価で授業への導入材料として使用できるようジグを設計し、その有効性を検証した。A4版,7ページ
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局所耕うん器具を用いた圃場通気性試験装置の開発
實野 雅太
東京農業大学 2015.03
Language：Japanese Publishing type：Doctoral thesis
局所耕うん栽培法の耕うん効果を評価する方法として、植生に覆われた圃場での定植作業を可能とするために開発した器具（局所耕うん器具）を用いて、長期的な圃場状態の経時変化を非破壊で評価する方法の開発を目的とした。A4版,122ページ
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Guidance of a Transplanting Skid Steer Vehicle with Variable Center of Gravity
NOE VELAZQUEZ LOPEZ，KIYOSHI TAJIMA，HIDEYUKI TANAKA, DO TUAN THANH, WATARU YUKUMOTO, MASATAKA JITSUNO,MASAYOSHI KATO, EIICHIRO SAKAGUCHI, JUNYA TATSUNO, TADASHI ISHII
International Journal of Environmental Rural Development 4 ( 1 ) 75 - 80 2013.04
Language：English Publishing type：Research paper (scientific journal)
ワイドフレーム・スキッドステア機構を持つ全自動移植機の自動走行制御を行うための数学モデル作成のための基礎的な研究で、特に車両の左右方向で重心位置が大きく変わる場合について考究した。また、旋回奇跡測定と旋回中心の算出方法について提案を行った。A4版,6ページ
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The Possibility of Adapt the Shaft Tillage Cultivation Method to Arid Land Farming
Masataka Jitsuno, Kiyoshi Tajima, Masayoshi Kato,Nariaki Toyoda, Noe Velazquez Lopez, Eiichiro Sakaguchi, Junya Tatsuno
日本沙漠学会誌「沙漠研究」 22 ( 2 ) 341 - 344 2012.06
Language：English Publishing type：Research paper (scientific journal)
環境保全型農業における一耕うん栽培体型として提案し、日本国内で栽培実験を繰り返してきた、局所耕うん栽培について、乾燥地農業へ適応可能性について検討を行い、提案を行った。A4版,4ページ
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局所耕うん器具を用いた耕うん同時評価法に関する研究―圃場通気性試験装置モデルの改良―
實野 雅太
東京農業大学 2012.03
Language：Japanese Publishing type：Master’s thesis
局所耕うん栽培法の耕うん効果を評価する方法として、植生に覆われた圃場での定植作業を可能とするために開発した圃場通気性試験装置のモデルを作成し、試験装置の特性を把握することを目的とした。A4版,78ページ