AGROCLIMATIC CONDITIONS FOR CORN CULTIVAT ION IN SLOVAKIA

The moisture provision of grain corn was analyzed in the Slovak Republ ic in 1971 to 1991. Total amount of temperatures in the period from pl anting to full ripeness was used as an integral indicator of temperatu re conditions for grain corn during vegetation. Hydrothermic coefficie nt K1 (Kurpelova, 1977) was calculated to evaluate rainfall conditions . This calculation is counted on a 50% effect of winter rainfall (0.5. R(X-III)) and total amount of precipitation during vegetation (R(IV-VI I)). Evaporation in interval from planting to full ripeness is express ed by ratio 0.18.TS(IV-VII). The achieved data were evaluated accordin g to the regions (Tab. I). Graphic representation of temperature and m oisture provision for corn growing in Slovakia is in Figs 1 and 2. Tem perature provision for corn, characterized by amount of temperatures i n the period from planting to full ripeness in Slovakia ranged from 2, 260 to 2,738-degrees-C. Temperature provision is declining with increa sing altitude, on average by 60 to 80-degrees-C foe each 50 m a.s. Acc ording to the indicator of rainfall K1 the driest conditions are in th e South-East part of West Slovakia region (0.80 to 0.96). The values o f K1 are increasing with higher altitude and equilibrium state occurs at the value 1.6. In Slovakia that stage is fixed on altitudes above 4 00 m a.s., where the region is less suitable for growing grain corn be cause of temperature. Based on evaluation we have divided the Slovak t erritory into six regions according to the temperature provision with nine subregions within each according to rainfall provision (Tab. III) .