The purpose of this study is to explore the robustness of the supply chain of raw vegetables for processing. A case study is conducted on potatoes for which about half of the domestic production is shipped for processing, including starch. In this study, we first examine what factors have contributed to this difference in robustness against disasters depending on the application. Second, we examine the production system in the production areas and check benefits for the potato producers to sell their production to potato chips manufacturers. In the case of raw food use, flexible transactions were conducted through the supply and demand adjustment function via the wholesale market. On the other hand, potato chips have a distribution structure that is efficient in normal times but vulnerable in times of emergency. The support provided by Calbee Potato for production and collection/shipping played an important role in the expansion of the production area.

Questionnaires were done for Fukushima University students and some subjects belonging to other societies outside the university aiming to clarify the conditions and opportunities to visit Iitate-mura village. The questionnaires (Ver.1) done in 2021 for inside the university were to know the information source to decide the visiting place, impression of the place for Fukushima University students. Additionally, in 2021-2022, questionnaires (Ver.2) which include questions asking the conditions necessary to visit Iitate-mura village were done for Fukushima university students, again, but for the different grades and faculties and for the persons belonging to three subjects outside the university. Based on the results, we knew the proportion of people visited Iitate-mura and the reasons for the visiting together with the types of the familiar SNS of people belonging to 7 subjects (3 for outside and 4 for inside the university) . The information obtained in this research is useful to make opportunities to visit Iitate-mura and thereby to increase residents and farmers and also populations concerning the activation of the region., especially, via communication information using SNSs those familiar to each subject. The results are useful and practical to set up the plan to activate Iitate-mura, more, via visits to there of various subjects.

Agricultural soil contaminated with radioactive materials due to the Tokyo Electric Power Company's (TEPCO's) Fukushima Daiichi Nuclear Power Station accident was mainly decontaminated by topsoil removal and soil dressing. A comparison of soils before and after decontamination at a farmer's field in the Yamakiya district of Kawamata revealed a large difference in total carbon (C), nitrogen (N), available N, and CEC. Especially in upland fields, the total C in the soil after decontamination was very low, and in paddy fields, the amount of available N in the soil after decontamination was undetectable. Decontamination greatly reduced the fertility of farmland soil, and recovery from soil degradation is an urgent task. Total C and available N recovered to some extent by rotary tillage. We conducted a model test examining the mixing ratio of the upper layer (top-dressed soil) and the lower layer (Andosol), changing the ratio of top-dressed soil by 0, 50, 80, and 100% (v/v). In soils with a higher ratio of top-dressed soil, N mineralization was low; plant growth was poor; and hairy vetch and N fertilizer application did not effectively change the situation. Poor basic physicochemical properties, lack of phosphorus supply, low pH buffering capacity, excessive accumulation of ammonium-N of top-dressed soil damaged plant growth. Mixing 20% or more of the lower soil by volume ratio and further fertilizer application may be expected to improve the plant growth.

Tomioka town and Okuma town, Fukushima prefecture, were extensively contaminated with radioactive materials during the nuclear accident. Post-decontamination field is often covered with mountain soil with low nitrogen fertility. It has been proposed to recover soil fertility by using compost and green manure to increase agricultural productivity. As a result of the cultivation test of various leguminous green manures, Hairy vetch (Vicia villosa Roth), in particular, had a large amount of nitrogen accumulation and was found to be effective in soil fertility recovery. It was also found that Persian clover (Trifolium resupinatum L.) is relatively insensitive to excessive humidity. In crop cultivation after green manure planting, it was confirmed that there was a positive correlation between the amount of nitrogen accumulation of the green manure and the yield of rice or buckwheat. On the other hand, there are many fields that have not resumed farming, and it is important to manage such fields while recovering soil fertility. As one of the means, the technique of collecting honey while cultivating leguminous green manure has been studied in post-decontamination field. The cultivation of green manure has not progressed much in farm management in this area. I think that the importance of soil fertility recovering and how to use green manure are not being well-communicated to farmers. In order to promote the cultivation area of green manure for farming resumption, it is important to disseminate information to producers.