The effect of irradiation on medium temperature and EC values in hydroponic longterm tomato cultivation

The yield results of long-term hydroponic tomato cultivation range from 40 to 70 kg/m2, the productivity is significantly influenced by growing conditions. We investigate the effect of irradiation on rootzone temperature and EC values in a greenhouse technology. The irradiation data were provided by the climate controlled irrigation system, root zone temperature and EC values were monitored. During the whole examined period, there was no major fluctuation. Examination of the probe data on two selected days show that the change in EC values is not outstanding, but their overall value is considered to be very high compared to the usual 7-8 mS cm-1 values.