Abstract The amount of paddy crop is usually increased by converting a continuous paddy field into a transferring cultivation between paddy and upland crops. To study the reasons for this increase, in Hokkaido a soil survey was made at 16 localities, where both types of cultivation were practiced. The survey was carried out on four different types of soil; peaty soils at Horomui (18,3),* Kurisawa (36,2), Ebetsu (23,2), and Iwamisawa (20,2); muck soil at Fukagawa (35,4); clay soils at Naie (28,3), Takikawa (31,1), Toyonuma (25,3) Fūen (80,2) and Higashiasahikawa (22,3); and sandy soils at Higashikawa (22,3), Pippu (30,2), Shimokawa (28,1), Kucchan (20,3), Kunneppu (16,2) and Ebetsu (30,2).