抄録
Most of our archaeologists have regarded obscurely that the origin of ricecrop and the history of rice-breeding began on the swampy grounds at the margin of ponds or marshes.
Accurately speaking, however, the localisation of wet rice field was not on morass-grounds under stagnant water, but clay-loam or loamy bog-beds under nearly stationary shallow water. Such consideration was corraborated from recent ecological experiments.
On the other side, I deduced “dry-land rice crop” by means of the shifting cultivation (Brandwirtschcft) was its origin. Morever, from bio-ecological viewpoint, I recognized that the dry-land cultivation was an agricultural type older than wet rice-farming (Sawah cultivation), especially in tropical and subtropical regions.
Consequently, in view of the rudimentary technical stage of the primitive society, the condition of soil colloid and ecology of rice-plant, I concluded two courses on the origim of rice-farming regionally; one was dry-land crop, the other, wet rice field.
