本報はほ場規模と作業体系が異なる条件で，水稲鉄コーティング湛水直播栽培体系の作業特性と機械導入条件を検討した．ほ場規模別の比較では1.5 haと0.3 haの2種類のほ場規模，作業体系別の比較では直播栽培での耕起，整地，均平を含む作業体系，耕起，整地，均平を含まない作業体系，慣行移植作業体系の3種類の作業体系を設定した．機械利用コストは試験区ごとにほ場作業量と燃料消費量を測定して算出した．ほ場規模別で比較すると，ほ場準備から収穫までの作業体系全体のほ場作業量は1.5 haほ場で同作業体系の0.3 haほ場より2.3 ha h^–1大きく，燃料消費熱量は2241 MJ ha^–1小さかった．作業体系別では，0.3 haほ場で耕起，整地，均平を含める作業体系が耕起，整地，均平を含めない作業体系と比較して0.8 ha h^–1（3934 MJ ha^–1），移植作業体系と比較して0.9 ha h^–1（3722 MJ ha^–1）大きかった．水稲鉄コーティング直播作業体系での機械利用コストは1.5 haほ場で生産現地の農作業基準賃金と同等であった．0.3 haほ場ではトラクタ，プラウ，バーチカルハロー，ロータリを同規模の畑作ほ場との汎用利用を想定した場合に，耕起，整地，均平作業を含めない直播作業体系と移植作業体系では同農作業基準賃金体系を下回った．しかし，耕起，整地，均平作業を含める条件では耕起，整地，均平を秋期に行い，負担可能面積を拡大して対応する必要がある．

 The purpose of this study is to clarify the history of the development in Chiba Newtown and the process of the generation of non-dwelling facilities through the interviews on the developers and analysis of the physical change of living environment. Through the research, followings were identified:

 1）The transition in Chiba NT development for 45 years

 ChibaNT has been developed for 45 years, and the plan was changed several times. At first, the project aimed to supply housings and it registered as the “new housing and urban development project”. Thus, residential area occupied a large proportion of area in masterplan. However, the plan and its concept changed and the development area were shrunk, and it had decisive influence on forming today’s living environment. Especially, the number of commercial and business facility estates has increased based on the change of plan which introduces specific business facilities and multiple land use. And also the developers actively attracted private enterprises by introducing “Limited-term land rent right.” In addition, the change was influenced from rapid change of housing demands and the attack of expropriation committee in Chiba by citizens who are protesting against Narita Airport construction.

 2）Emergence process and accumulation of non-dwelling facilities

 Huge part of the area for residential estate change to the area for the commercial and business facilities, under the influences of the change of the plan including the shrinking of the development area, extension of planning period, and introducing of the estate of specific business facilities and multiple land use. Especially, the ratio of commercial and business facility estates in Chuou district and Makinohara district became large, and a lot of non-dwelling facilities were built between 1995 and 2015. And this change overlaps with the change on the masterplan. In 1995, small commercial facilities located near ChibaNT-Chuou Sta. and at neighborhood centers and a business concentration area were being formed on the north side of ChibaNT-Chuou Sta. On the other hand, in 2015, large commercial facilities located near ChibaNT-Chuou Sta. and along the main road, and the new residential areas are constructing. Laboratories and offices accumulated in "business mall", and logistics facilities were being formed in the northeastern part of the Chuou district.

 As described above, there are two types of accumulation trend in the commercial and business facility estate, which was changed from residential estate. One is the accumulation of large commercial facilities, another one is that of logistics and business facilities.

2020年以降、COVID-19によるパンデミックへの対応は世界の最重要課題となっている。日本では、2020年4月に最初の緊急事態宣言が発令され、対応が続いている。今後の対策を検討する上で緊急事態宣言による外出制限の効果を検証することが必要である。そのような問題意識から、本研究では、2020年4月の研究事態宣言期間中の茨城県つくば市を対象に、モバイル空間統計（NTTdocomo）を用いて、外出制限の効果を分析することを目的とする。はじめに人口流動を類型化し、空間的分布を分析した。住宅地では昼間の人口増加がみられた一方で、商業施設・研究機関・大学の立地する地区では人口が減少していた。人口増減は、市外人口の流動と相関があり、また土地利用の違いでも説明できた。