Tochigi Prefecture stands third in the number of farming households which have each the cultivated acreage of over 2 hectares, and stands twelfth both in cultivated acreage and in the number of farmers engaged in farmifig over 150 days a year. Under the influence of economic growth, regular farmers have remarkably decreased in recent years, and farming villages have been depopulated in this prefecture, too, as in other prefectures. At present, two farming villages, one mountain village and one mining town are alienated, and each of them has its own history of alienation. In all the alienated towns and villages, the birth rate is low, while the mortality is generally high. Biologically, therefore, those alienated areas have necessarily decreased in population, and moreover, emigration for work from necessity in this social economy has accelerated their depopulation. This prefecture ranks first in Japan in the production of strawberries, dried gourd shavings, hemp and mulberry saplings. In all the towns of Ujiie, Minaminasu, Haga and Ichikai along the Yamizo Mountain Range, the mortality from cerebral apoplexy and that from cancer are both high, and the corrected mortality is high, too. The infant death rate and perinatal death rate of this prefecture are higher than the national average. The infant death rate of all the alienated towns and villages except Ashio Town is rather high, and the subordinated population index (population of 0-14 years+that of over 65 years/population of 15-64 years×100)is high, too. The corrected motality is generally low from the southeast to the northwest along the Tobu Railway. The rate of longevity(population of over 70 years/whole population×100)is high in the northwest and low from the southest to the northwest. The aging index(population of over 65 years/population of 0-14 years×100)is high in the east. The aged population index(population of over 65 years/population of 15-64 years×100)is high in the east and low in the west, which resembles the distribution of the aging index.
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