<p>This data comes from the book "Soil of Kustanai Oblast", Volume 6 of the series "Soil of the Kazakhstan Soviet Socialist Republic" compiled by the Institute of Soil Science of the Academy of Sciences of the Kazakhstan Soviet Socialist Republic in 1966. The complete set of books consists of 16 volumes. It was written under the guidance of the Soviet reclamation movement in 1954 and on the basis of soil field surveys organized by the Ministry of Agriculture or local government departments in various states. Experts and scholars from the Institute of Soil Research of the Kazakhstan Academy of Sciences collected, sorted and comprehensively studied historical data and field survey data. The purpose of soil survey is to understand the situation of agricultural land and unreclaimed land during the reclamation period and select suitable reclaimed land for planting. The results formed served the agricultural production and agricultural planning of various regions (prefectures) of Kazakhstan at that time. The writing data of "Soil of Kustanai Oblast" come from the land cover and plant inspections by the Central Comprehensive Scientific Research Team of the Ministry of Agriculture of the Republic of Kazakhstan from 1952 to 1953, the results of the survey on suitable cultivated land planning of collective farms during the Soviet Land Reclamation Movement in 1954, and the survey and research data on soil conditions in the late period of reclamation from 1956 to 1958, as well as the historical results and manuscript data of soil inspections in the state that had been publicly published at that time. The book describes in detail the state's physical geography, land cover, main soils and their physical and chemical properties, and the role of soil research in agricultural production planning. The soil chemical analysis in the book was completed by the laboratory of the Institute of Soil Research, Academy of Sciences of the Republic of Kazakhstan. </p> <p>In 2017, the Central Asian Ecology and Environment Research Center of the Chinese Academy of Sciences obtained a scanned copy of this book from the Library of the Kazakhstan Academy of Sciences through an international cooperation project. After returning to China, the Central Asian Environment and Ecology Research Center of the Chinese Academy of Sciences organized Russian professionals and soil professional technicians to review the book. The soil profile data table was translated and organized to form a spreadsheet version of "1966 Soil Data of Kustanai Oblast, Kazakhstan". The data contained 127 profile sampling points. It is inevitable that there will be inappropriate words in the process of translation and collation, but the numerical values, decimal places, and units of measurement are all transcribed according to the situation presented in the scanned document without modification, and have been verified by multiple people many times. </p>