東北タイ・ドンデーン村 : 稲作の類型区分 (<特集>東北タイ・ドンデーン村)

Abstract

In Don Daeng, rice is grown in rain-fed fields, and the cultivation method, growth and yield of rice are directly affected by the water conditions, landform and soil fertility of the location. Rice cultivation was classified into three types. The first type occupied lower landform units, which had plentiful water and fertile soil. Late-maturing glutinous varieties were mainly planted. Transplanting was earlier and harvesting was later than with the other types. Planting density was low. Yielding ability was stable in droughty years but the crop was easily destroyed by flood. The second type occupied intermediate landform units, where water supply and soil fertility were moderate. Medium-maturing glutinous varieties were dominant. Transplanting and harvesting were of intermediate timing. Planting density was medium. Yielding ability was less stable in droughty years. The third type occupied higher landform units with poor water conditions and moderate or poor soil fertility. Medium and early-maturing glutinous varieties and non-glutinous varieties were planted. Late-maturing varieties were rare. Transplanting was later and harvesting was earlier than with the other types. Planting density was high. Yielding ability was the lowest of the three types in droughty years, but as high as the other types in rainy years.