Zatrudnienie w rolnictwie jako czynnik jego rozwoju
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A basic trend in demographic changes occuring in administrative provinces of Central Poland is reduction in the number of agricultural population. In as much as in 1950 the sh a re of population making its livelihood in the agriculture ranged between 36.4 perc. (Kalisz province) and 52.6 perc. (Sieradz province) in 1978 it amounted from 30.4 p er cent to 43.0 per cent respectively. An exception here is the industrial urban province of Łódź in which the agricultural population represented only 4.5 p er cent of the total population. Changes in the number of the population making its livelihood in the agriculture were reflected in the manpower supply measured by the number of the professionally active people per 100 ha of arable land. In all administrative provinces it shows a close correlation with the area structure of farms, level of mechanisation and specialization of the agriculture and ecological conditions. Due to the manpower outflow from the agriculture the Professional structure of the population in provinces of Central Poland will change as well. According to estimates made by the authors in 1990 the share of the population making its livelihood in the agriculture will exceed the national average (12.7 per cent) in this area, and it will amount from 18.9 per cent in Piotrków administrative province to 32.8 per cent in Włocławek province (and 3.1 per cent in the urban province of Łódź).