1. This work was started in 1953, when soil survey and analysis for chemical and physical properties of the soils were made. Since 1955 a series of well organized experiments for the reclamation of the soils has been conducted and is still in progress.2. This irrigated region is situated in the north-western part of Chilin Province. It is a low river terrace, where solonchak of different degrees of alkalization occupies a large area,the aurface aoil of the low plain consisting of high content of exchangeable sodium dominated by the bicarbonate of soda. It is therefore, called the meadow bicarbonate solonchak and is subdivided in accordance with the amount of total soluble salts together with their related characteristics into strong,medium and light solonetzic meadow solonchak.