Photosynthetically active radiation represents an ecological basis for determining the distribution of plants and favourable areas to different crops. The aim of this paper is to observe the direct influence of radiation on the development of crops. We used data on 25 years and calculation methods for the statistical knowledge of radiation and its distribution to specific hours. Here were performed on measurements of solar direct radiation and diffuse solar radiation, then we calculated the photosynthetically active radiation on basis of which we managed to make some estimation on the amount of energy that occurs in costal areas, how it is distributed over a period of one year and certain times characteristic. In this way we manage to make a concordance between the distribution of photosynthetically active radiation and the vegetation period of crops.

photosynthetically active radiation, solar direct radiation; active radiation; crops

Presentation: oral