Summary
The Wrocław version of hydroponic culture was applied. The optimal dose of mineral nutrient solution for root-fertilizing was found to be 19,6g and 22,4g of mineral salts per one plant during the whole vegetation season. In a separate experiment plants with optimal root fertilization were sprayed with multicomponent solutions of mineral salts. The sprays were applied weekly for 15 weeks. The concentrations of solutions for spraying were: 0,28, 0,84 and 1,4 per cent. The greatest increase of fruit yield was noted after the 0,84 per cent solution. At optimal concentration of spray solution (0,84%) chelating agents added (EDTA or humate) had no effect. Addition of the chelating agents to the 1,4% solution attennated its inhibitory effect. The humate gave a better effect than EDTA. A tenfold i
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