Ecological Studies on the Establishment of Regionality in Early Planting Culture and Great Harvest of Rice Plant

Abstract

In 1959 and 1960, the experiments were carried out to make clear the characteristic growth of rice plants in high lands Surige (Hiraga town level 350m) and Utarube (Towada town level 400m), and in seaside Shimooguni (Kanita town) and Itikawa (Hatinohe city) where the north-easterlies named “Yamase wind” prevailed, comparing with inland districts (Kuroishi and Fujisaka) in Aomori Prefecture. In order to investigate the effect of meteorological conditions on the late developmental stage of rice plants, the plants planted in pots were removed between inner districts and high lands or seaside region mutually on determined dates.Results obtained are as follows:(1) In the high lands and seaside region, the growth of early developmental stage of rice plants was inferior to inner districts and the heading was dates were retarded.(2) The safety time for the heading was longer in inner districts than in high lands and in seaside region (See Fig. 2)(3) Main characteristics in growth of rice plants varied by exchanging the places, naimely the meteorological conditions in late stage of the growth.