The article presents a generalized vision of the place and role of the Siberian Scientific Agricultural Library (SIBSAL), libraries and information units of scientific organizations of agricultural profile of Siberia in the scientific communications system. The dynamics of SIBSAL interaction with the libraries of regional scientific research institutions (SRI) in connection with changes in the political and economic life of the country in the 1990-s are considered. Approaches to changing the concept of methodological management of libraries and information departments of specialized organizations are presented. Influence of fundamental transformations, entailing the reform of the scientific field and digitalization of the society, on the change in SIBSAL status, its functions and the model of interaction with NRU is described. There are given the results of scientific research conducted in 2017-2021 to study the state and development of the information support system of agricultural science, during which data were collected on changes in the organizational and legal form of scientific institutions, their activities, individual information preferences of scientists, and also information about the current state of the information and library system of agricultural science of Siberia. In connection with the creation of a new interregional association, tasks are set to study the state of libraries and information units of the Agricultural Research Institute of the Far Eastern and Arctic region, which will expand the boundaries of communication in the agricultural information space.