The aim of the article was to develop formulas, which can be used to model forecasts of production and economic effects of irrigated faba bean (Vicia faba var. minor), depending on drought severity level in a growing season. For the analysis we used data of ten-year (2005 – 2014) production effects of irrigated faba bean and indices calculated on the basis of meteorological data from the measuring point set in the vicinity of the experimental site in region of Bydgoszcz city, central Poland. Based on them, the most relevant relationships between irrigation productivity and chosen drought indices, calculated for a period of high water needs of the plant, were searched. Presented results have demonstrated that the non-irrigated faba bean yields depended significantly on drought severity level and showed very high variability in time. Irrigation contributed to a significant 49% increase in yields and their stability in the years. Due to this treatment, the coefficient of variation of the yield decreased from 55.1 to 19.6%. The production effects of irrigation depended significantly on moisture conditions over the period of high water needs of faba bean. In wet seasons, the increases in yields due to irrigation were insignificant and about three-fold lower, while in the dry periods – more than a half higher (57%) than the average increases. The results presented in the work are of great importance because they can be used to model forecasts of production, as well as to plan the development of irrigation systems in the given area.

The purpose of this paper is to report on the changing social structure and function of the Tochikairyoku (Land Improvement Associations) in Kitakami, Iwate Prefecture, located in North East Japan. This case study was conducted by interviewing executive members of the Iwate Chubu Tochikairyoku and the farming membership working the land and by collecting and examining all available data pertaining to the changes affecting the functioning of this organization. The Tochikairyoku is a non-profit public organization of and for farmers engaged in agriculture or animal husbandry and serves to liaise between farmers and central and local governments. All the costs of management and staff are borne by the members. All decisions to be undertaken must be ratified by the members. The results of the case study indicate that there has been a significant consolidation in the number of Tochikairyoku and farms owing to the dwindling rural population and the ageing of those actively farming the land. Another major factor has been the recent changes in the Japanese Government’s policy that now favours bigger agricultural units over smaller farmers. The Tochikairyoku are instrumental in promoting the new government policies by maintaining irrigation infrastructure and improving the quality of arable land in order to encourage the leasing of land from the smaller farmers to the bigger farm units. The new 2018 Law has effected changes in the election of executive members of the Tochikairyoku to include representatives of agribusiness interests and has introduced a reform of the Tochikairyoku’s accounting practices to make them more transparent.