CLIMATIC VARIABILITY AND CROP PRODUCTION

The relationship between the climatic conditions and agricultural production was so for analysed from the point of view of climatic impacts. In our days it is, however, practical to consider the processes of agricultural production exert influence on meteorological conditions in regional scale. Therefore the connection between the meteorological conditions and agricultural production Or th e connection between the meteorological conditions and cropping may be considered as an interaction containing a stronger climatological effect. An important characteristic of climate is the variability. This is expressed in the variations of climatic elements between relatively stable extreme values. In some cases the extreme values can also change. Primarily the climate of our country was characterized by comparing the mean temperature and precipitation values of meteorological stations in our country to the that of geographical latitudes (Tables 1-2.). It was determined how 30 years temperature averages can vary on the basis of 210 years data of Budapest (Table 3). For analysing the variations of precipitation averages 150 years data were used (Table 4.). The mean values and extreme values of different seasons were also investigated (Table 5.). These values vary in large intervals, too. Using 100 years of 25 stations the temperature conditions (Table 6.) and precipitations conditions (Table 7.) of vegetation period for winter cereals were studied. The temporal variations in temperature and in precipitation for winter season (Figure 1 and 2) and for summer season (Figure 3 and 4) were investigated too.