Abstract
This report summarizes the soil survey results of peaty paddy—upland rotation fields spread along the basin of the lower stream of the River Ishikari.
1) The thickness of surface soil layer,composed of peat and clayish dressed soil,is about 30cm in average.
2) Soil physical properties of surface layer are better than those of the fields of clayish lowland and upland soils. But some fields have too—thick clayish surface layer caused bad soil tilth and poor surface permeability.
3) Ground water level of upland crop fields is above 60cm in the farming season, and trafficability for tractor is not inferior to that of the fields of clayish soils.
4) In this area , soil dressing by government enterprise started around 1955—1960 , and it was carried out 3—5 times in total so far at each field.
